Terahertz Radiation Systems: Technologies and Global Markets Terahertz Radiation Systems: Technologies and Global Markets The global market for terahertz radiation devices and systems reached - Market research report and industry analysis - 9103955

Systems, devices, methods, and computer-readable media relating to terahertz radiation detection are disclosed. A method of detecting terahertz radiation may include transmitting a reference beam and a signal beam through a common-path interferometer. The method may further include transmitting a terahertz beam through a target object. Furthermore, the method may include causing the signal beam and the terahertz beam to simultaneously propagate through an electro-optical element within the common-path interferometer after transmitting the terahertz beam through the target object to induce a phase delay between the signal beam and the reference beam. In addition, the method may include calculating the phase delay and calculating an amplitude of an electric field of the terahertz beam from the phase delay.

We demonstrate resonantly enhanced transmission of freely propagating coherent terahertz radiation through free-standing metal foils perforated with periodic arrays of sub-wavelength apertures. These arrays consist of 400 µm diameter apertures periodically spaced by 1 mm and 600 µm diameter apertures periodically spaced by 1.5 mm. We measure absolute amplitude transmission coefficients of ~0.6 at the resonance wavelength. Correspondingly, the ratio of the absolute amplitude transmission coefficient to the fractional aperture area at these resonance frequencies is ~5. This value at terahertz frequencies is significantly larger than equivalent values measured at optical frequencies.. ©2004 Optical Society of America. Full Article , PDF Article ...

Provided herein are methods and systems for detecting biomolecular binding events using gigahertz or terahertz radiation. The methods and systems use low-energy spectroscopy to detect biomolecular binding events between molecules in an aqueous solution. The detected biomolecular binding events include, for example, nucleic acid hybridizations, antibody/antigen binding, and receptor/ligand binding.

We present a planar large-area photoconducting emitter for impulsive generation of terahertz (THz) radiation. The device consists of an interdigitated electrode metal-semiconductor-metal (MSM) structure which is masked by a second metallization layer isolated from the MSM electrodes. The second layer blocks optical excitation in every second period of the MSM finger structure. Hence charge carriers are excited only in those periods of the MSM structure which exhibit a unidirectional electric field. Constructive interference of the THz emission from accelerated carriers leads to THz electric field amplitudes up to 85 V/cm when excited with fs optical pulses from a Ti:sapphire oscillator with an average power of 100 mW at a bias voltage of 65 V applied to the MSM structure. The proposed device structure has a large potential for large-area high-power THz emitters ...

We examined the effect of the bias current position on the radiation of intense and coherent terahertz electromagnetic waves from the intrinsic Josephson juncti

...It was a special moment for Michael Panzner of the Fraunhofer Institut...According to Panzer the special thing about the terahertz (THz) scann...The scientists used short electromagnetic pulses that penetrate the va...,Detective,work,using,terahertz,radiation,biological,biology news articles,biology news today,latest biology news,current biology news,biology newsletters

This paper investigates the effect of relevant physical parameters on transient temperature elevation induced in human tissues by electromagnetic waves in the terahertz (THz) band. The problem is defined by assuming a plane wave, which, during a limited time interval, normally impinges on the surface of a 3-layer model of the human body, causing a thermal transient. The electromagnetic equations are solved analytically, while the thermal ones are handled according to the finite element method. A parametric analysis is performed with the aim of identifying the contribution of each parameter, showing that the properties of the first skin layer (except blood flow) play a major role in the computation of the maximum temperature rise for the considered exposure situation. Final results, obtained by combining all relevant parameters together, show that the deviation from the reference solution of the maximum temperature elevation in skin is included in the coverage intervals from −30% to +10% at 0.1 ...

In a significant breakthrough, scientists at the Tata Institute of Fundamental Research (TIFR), Mumbai, have devised a high-power radiation source in the terahertz (THz) region of the electromagnetic spectrum. This study, done in collaboration with laboratories in Greece and France, will be published in the journal Nature Communications on Oct 30, 2017.

0063] Because of subwavelength THz mode confinement in the waveguide, in one aspect the THz DFG output from the QCLs may be significantly divergent and THz out-coupling efficiency may be poor. Accordingly, in yet another embodiment, a silicon hyperhemispherical lens 390 optionally may be attached to or otherwise in optical communication with (e.g., suitably proximate to) the output facet 370, as shown in FIG. 12. In one exemplary implementation, the lens 390 may be a 2 mm-diameter, 1.19 mm-height high-resistivity silicon hyperhemispherical lens, positioned to within 5 μm of the output facet 370. For lens alignment, a mid-JR output from the QCL may be imaged with an MCT detector. In some implementations, QCLs with a lens demonstrated a 25-fold increase in collected THz DFG power output, compared to devices without a lens. In various aspects, the increase stems from improved collection efficiency (from estimated ,10% to approximately 100%) and improvements in THz out-coupling efficiency. Typical ...

We present a polarization-insensitive plasmonic photoconductive terahertz emitter that uses a two-dimensional array of nanoscale cross-shaped apertures as the plasmonic contact electrodes. The geometry of the cross-shaped apertures is set to maximize optical pump absorption in close proximity to the contact electrodes. The two-dimensional symmetry of the cross-shaped apertures offers a polarization-insensitive interaction between the plasmonic contact electrodes and optical pump beam. We experimentally demonstrate a polarization-insensitive terahertz radiation from the presented emitter in response to a femtosecond optical pump beam and similar terahertz radiation powers compared to previously demonstrated polarization-sensitive photoconductive emitters with plasmonic contact electrode gratings at the optimum optical pump polarization ...

At the upcoming CLEO/QELS meeting in Baltimore, an MIT-Sandia team will demonstrate the first real-time THz imaging system that obtains images from 25 meters away. The technique takes advantage of the fact that there are a few windows, or frequency ranges, of the terahertz spectrum that do not absorb water very strongly. The MIT-Sandia group designed a special, semiconductor-based device known as a quantum cascade laser that delivers light in one of these windows (specifically, around 4.9 THz). They shine this light through a thin target with low water content (for example, a dried seed pod), and a detector on the other side of the sample records an image. A cryorefrigerator maintains the laser at a temperature of 30 Kelvin, where it produces 17 milliwatts of power (as opposed to the microwatts of power typical of pulsed terahertz sources) in order to provide enough terahertz radiation to obtain a decent image. Increasing the power of the lasers and sensitivity of the detectors can ...

A conductive layer of Ti, with a sheet resistance of about 220 Ω/sq, was placed in the dielectric spacer of an Al/SiOx/Al metamaterial terahertz absorber at various depths to probe the effect on the absorption of terahertz radiation. For a square size of 15 µm and a periodicity of 21 µm, and dielectric thickness approximately 1.6 µm, maximum absorption was 60%, 88%, and 94% for Ti layers 297, 765, and 1270 nm deep into the SiOx. Finite element simulations of the absorption correlated well with that of the measurements. This indicates that metamaterials with an embedded high temperature coefficient of resistance (TCR) conducting layer can be used for fabrication of microbolometers with tuned spectral sensitivity.. ©2013 Optical Society of America. Full Article , PDF Article ...

The problem, Læonard said, is that terahertz radiation typically requires an antenna to achieve coupling into a single nanotube due to the relatively large size of terahertz waves. The Sandia, Rice University and Tokyo Institute of Technology research team, however, found a way to create a small but visible-to-the-naked eye detector, developed by Rice researcher Robert Hauge and graduate student Xiaowei He, that uses carbon nanotube thin films without requiring an antenna. The technique is thus amenable to simple fabrication and represents one of the teams most important achievements, Læonard said ...

In carrier multiplication, the absorption of a single photon results in two or more electron-hole pairs. Quantum dots are promising materials for implementing carrier multiplication principles in real-life technologies. So far, however, most of research in this area has focused on optical studies of solution samples with yet to be proven relevance to practical devices. We report ultra-fast electro-optical studies of device-grade films of electronically coupled quantum dots that allow us to observe multiplication directly in the photocurrent. Our studies help rationalize previous results from both optical spectroscopy and steady-state photocurrent measurements and also provide new insights into effects of electric field and ligand treatments on multiexciton yields. Importantly, we demonstrate that using appropriate chemical treatments of the films, extra charges produced by carrier multiplication can be extracted from the quantum dots before they are lost to Auger recombination and hence can ...

Although some radiations are marked as N for no in the diagram, some waves do in fact penetrate the atmosphere, although extremely minimally compared to the other radiations The electromagnetic (EM) spectrum is the range of all possible electromagnetic radiation. ... This article is about electromagnetic radiation. ... In the NATO phonetic alphabet, X-ray represents the letter X. An X-ray picture (radiograph) taken by Röntgen An X-ray is a form of electromagnetic radiation with a wavelength approximately in the range of 5 pm to 10 nanometers (corresponding to frequencies in the range 30 PHz... For other uses, see Ultraviolet (disambiguation). ... Visible light redirects here. ... For other uses, see Infrared (disambiguation). ... Electromagnetic waves sent at terahertz frequencies, known as terahertz radiation, terahertz waves, terahertz light, T-rays, T-light, T-lux and THz, are in the region of the electromagnetic spectrum between 300 gigahertz (3x1011 Hz) and 3 terahertz (3x1012 Hz), ...

The physics of artificial structures of reduced dimensionality is one of the main emerging areas of condensed matter physics, and may form the basis of future terahertz electronics, quantum computing technology and novel type of materials known as metamaterials. As it was recently established arrays of quantum dots and Josephson junctions represent the most illustrative example of artificial materials with highly nonlinear and reactive properties usually characterizing metamaterial media. The Conference aims to cover these developments; in particular, recent achievements in Josephson physics, terahertz radiation, metamaterials and other related phenomena. Topics will include: arrays of Josephson junctions, quantum dots and magnetic nanoparticles; metamaterials, superlattices and band gap materials; quantum computing and tunneling phenomena; THz radiation and associated phenomena; nanotubes and nanowires; Josephson vortex dynamics. The conference aims at reviewing the fundamentals and outlining ...

The logical next step in the development of innovative, ever-faster (opto-)electronic components is to access the terahertz frequency range. Until now, however, the materials and technologies required for the simple, efficient generation and conversion of spectral tunable terahertz radiation were lacking. Graphene - an ultrathin material consisting of a single layer of interlinked carbon atoms - has long been discussed as a potential material to achieve this. In a groundbreaking experiment, a team of HZDR researchers led by Dr. Sergey Kovalev and Prof. Michael Gensch (previously at HZDR, now at TU Berlin and Deutsches Zentrum für Luft- und Raumfahrt (DLR, German Aerospace Center) in collaboration with the Max Planck Institute for Polymer Research and the University of Duisburg-Essen (UDE), has managed for the first time to experimentally prove the theoretically predicted, strongly nonlinear properties of graphene in the terahertz range for the first time. With the aid of the unique experimental ...

Their synopsis: We consider the influence of a terahertz field on the breathing dynamics of double-stranded DNA. We model the spontaneous formation of spatially localized openings of a damped and driven DNA chain, and find that linear instabilities lead to dynamic dimerization, while true local strand separations require a threshold amplitude mechanism. Based on our results we argue that a specific terahertz radiation exposure may significantly affect the natural dynamics of DNA, and thereby influence intricate molecular processes involved in gene expression and DNA replication ...

The enhancement of acoustic waves, from audible into the ultrasonic range, is a linear function of the THz intensity incident on a laser-induced plasma, making THz-enhanced acoustics (TEA) useful for THz detection. Using a dual-color laser field to control electron trajectory inside the plasma, THz spectroscopic information can be encoded into the acoustic emission, making it possible to obtain the electric field profile of a THz pulse by simply listening to the plasma. A nearly instantaneous heating of a gas emits a shock wave through photoacoustics that quickly relaxes into an acoustic wave. The acoustic pulse contains a broad spectrum of frequencies that extend well beyond the range of human hearing into the ultrasonic range. When a broadband THz pulse is focused collinearly and simultaneously onto the plasma region, the THz field serves to accelerate freed electrons, giving them additional kinetic energy. Subsequent electron acceleration and collision between neighboring air molecules ...

In recent years, terahertz (THz) radiation has been widely used in a variety of applications: medical, security, telecommunications and military areas. However, few data are available on the biological effects of this type of electromagnetic radiation and the reported results, using different genetic or cellular assays, are quite discordant. This multidisciplinary study focuses on potential genotoxic and cytotoxic effects, evaluated by several end-points, associated with THz radiation. For this...

To create a FEL, a beam of electrons is accelerated to almost the speed of light. The beam passes through a periodic arrangement of magnets with alternating poles across the beam path, which creates a side to side magnetic field. The direction of the beam is called the longitudinal direction, while the direction across the beam path is called transverse. This array of magnets is called an undulator or a wiggler, because due to the Lorentz force of the field it forces the electrons in the beam to wiggle transversely, traveling along a sinusoidal path about the axis of the undulator. The transverse acceleration of the electrons across this path results in the release of photons (synchrotron radiation), which are monochromatic but still incoherent, because the electromagnetic waves from randomly distributed electrons interfere constructively and destructively in time. The resulting radiation power scales linearly with the number of electrons. Mirrors at each end of the undulator create an optical ...

SALT LAKE CITY - University of Utah engineers have discovered a filter for wireless communications that could one day allow cell phone users and internet surfers to download data a thousand times faster. Two years ago, Andrew Paulson started thinking of ways to tap into terahertz radiation, which is

A transition-Cherenkov electromagnetic emission by a femtosecond laser pulse propagating in a self-induced plasma channel in air has been very recently proposed as mechanism for production of terahertz (THz) radiation in the forward direction. In this paper, we study in detail the theory of the transition-Cherenkov process. The theoretical model is developed and compared with recent experimental results for several gases.

We report the production of high power (20 watts average, {approx}1 Megawatt peak) broadband THz light based on coherent emission from relativistic electrons. We describe the source, presenting theoretical calculations and their experimental verification. For clarity we compare this source with one based on ultrafast laser techniques, and in fact the radiation has qualities closely analogous to that produced by such sources, namely that it is spatially coherent, and comprises short duration pulses with transform-limited spectral content. In contrast to conventional THz radiation, however, the intensity is many orders of magnitude greater due to the relativistic enhancement.

C57BL/6 Mouse Mesenchymal Stem Cells derived from bone marrow of C57BL/6 mice that have a strong capacity for expansion. Multipotential differentiation ability along osteogenic, chondrogenic and adipogenic lineages. Tested negative for bacteria, fungi, and mycoplasma.

Preliminary Assessment of the Behaviour of Chitosan/Poly(Butylene Succinate) Scaffolds Seeded with Mouse Mesenchymal Stem Cells for Cartilage Tissue ...

TY - CONF. T1 - Effects of THz radiation on human fibroblasts in-vitro: Exposure set-up and biological endpoints. AU - Gallerano, G.P.. AU - Giovenale, E.. AU - Nenzi, P.. AU - De Amicis, A.. AU - De Sanctis, S.. AU - Di Cristofaro, S.. AU - Franchini, V.. AU - Lista, F.. AU - Regalbuto, E.. AU - Sgura, A.. AU - Coluzzi, E.. AU - Bei, R.. AU - Fantini, M.. AU - Benvenuto, M.. AU - Masuelli, L.. PY - 2014/11/13. Y1 - 2014/11/13. N2 - In vitro exposures of human fibroblasts have been performed in a wide band between 100 and 150 GHz using the ENEA Compact Free Electron Laser. The methodology of the study and the exposure set-up will be presented together with an analysis of preliminary results.. AB - In vitro exposures of human fibroblasts have been performed in a wide band between 100 and 150 GHz using the ENEA Compact Free Electron Laser. The methodology of the study and the exposure set-up will be presented together with an analysis of preliminary results.. UR - ...

Laser-induced emission from rhodamine-B dye embedded in pseudo band gap opaline photonic crystals is discussed. The photonic crystals are fabricated using rhodamine-B doped polystyrene colloids and show 65% reflectance at the stop band centered at 604 nm. The reflectance of the crystal is increased to 74% by coating with a thin layer of gold. Both spontaneous and stimulated emissions of the dye are observed in the photonic stop band environment by exciting the crystal with the second harmonic (532 nm) of a Q-switched Nd:YAG laser. The thin layer of gold functioned as a high reflecting end mirror to the dye-doped cavity when the crystal is pumped from the substrate side. Angle-dependent suppression at the stop band wavelength is observed in the spontaneous emission of the dye. Spectrally narrow stimulated emission and lasing is achieved in the gold coated dyed PhC at a threshold pump power of 60 mW in a selective direction of 22 degrees from the direction of excitation. By studying emission from ...

Terahertz (THz) radiation is defined as electromagnetic radiation with frequencies ranging from 0.1 to 10 THz. In recent years, many THz sensing and imaging technologies have been developed that have revolutionized the landscape of this rapidly evolving research discipline. These innovative technologies are now finding increasing use for a host of medical, military, and security applications. The emergence of these innovative THz-based systems has opened the door for numerous exciting applications, but the introduction of these new systems has also prompted safety concerns regarding this new technology and has stimulated much interest and activity in the ever growing THz bioeffects research community.. The mission of AFRLs Radio Frequency Radiation Branch is to understand the fundamental effects of exposure to THz radiation not only to support the development of exposure standards to ensure the safety of our military personnel, but also to identify areas ripe for exploitation.. Specifically, we ...

Figure: (a) Electro-optic measurement of a THz pulse from the TELBE undulator utilizing the developed high-reprate pulse-resolved detection scheme which allows to correct for arrivaltime jitter and intensity fluctuations at repetition rates of presently up to 100 kHz [1] A demonstrator device for the European XFEL is under construction . This detection scheme opens up characterize the superradiant THz sources at TELBE, (b) undulator and (c) diffraction radiator, with a time resolution of better than 13 fs (rms) and a dynamic range of up to 1000000. The main focus of the actual research activities at the HZDR within the program topic accelerator-research and development: subtopic 3 ps - fs photon and electron beams (ARD - ST3) is in the development of versatile (THz-based) diagnostic for electron bunches and superradiant THz sources. To this end (T)ELBE serves within ARD-ST3 as a testfacilitiy for diagnostics on quasi-cw electron and photon beams. Two Examples for recent breakthroughs are the ...

If you use this products in your scientific publication, it should be cited in the publication as: Creative Bioarray cat no. If your paper has been published, please click here to submit the Pub Med ID of your paper to get a coupon. ...

THz waves are transparent to most of the dry dielectric materials. This property makes THz wave a promising candidate for nondestructive evaluation of the internal structures of targets. THz wave...

The THz portion of the electromagnetic spectrum bridges the gap between electronics and optics and provides a wealth of opportunity for technological exploitation in areas such as free space communication, security, bio-sensing and trace gas detection. Metamaterials provide a powerful tool for the manipulation of THz radiation, but the tunability required for switches and modulators is difficult to achieve in predominantly metal based devices. On the other hand, the ability to electrostatically control the charge density in graphene has enabled tunable and switchable plasmonic devices [5]. Along with colleagues at Exeter and collaborators at ETH Zurich and the University of Augsburg, I have developed hybrid structures comprised of graphene plasmonic resonators coupled to complementary split-ring resonators (CSRR), thus demonstrating a highly tunable metamaterial, where the interaction between the two resonances reaches the strong-coupling regime. Such hybrid metamaterials have been employed in ...

Cyclin-dependent kinases 12 and 13 (CDK12 and CDK13) play critical roles in the regulation of gene transcription. However, the absence of CDK12 and CDK13 inhibitors has hindered the ability to investigate the consequences of their inhibition in healthy cells and cancer cells. Here we describe the rational design of a first-in-class CDK12 and CDK13 covalent inhibitor, THZ531. Co-crystallization of THZ531 with CDK12-cyclin K indicates that THZ531 irreversibly targets a cysteine located outside the kinase domain. THZ531 causes a loss of gene expression with concurrent loss of elongating and hyperphosphorylated RNA polymerase II. In particular, THZ531 substantially decreases the expression of DNA damage response genes and key super-enhancer-associated transcription factor genes. Coincident with transcriptional perturbation, THZ531 dramatically induced apoptotic cell death. Small molecules capable of specifically targeting CDK12 and CDK13 may thus help identify cancer subtypes that are particularly ...

The relatively short wavelength of mm-wave and THz radiation coupled with good transmission through many dielectric materials allows images to be formed of concealed objects. This chapter gives an overview of the detectors, their associated circuitry, and system developments over the past 10 years, focussing on personnel security screening. We will discuss the phenomenology of imaging at these wavelengths, introduce the reader to the basic architectures being used and developed for image forming instruments, show examples of systems, and also discuss the feasibility of spectroscopic THz imaging for security screening applications.. ...

Bacterial nanocellulose (BNC) is an emerging biomaterial since it is biocompatible, integrates well with host tissue and can be biosynthesized in desired architecture. However, being a hydrogel, it exhibits low affinity for cell attachment, which is crucial for the cellular fate process. To increase cell attachment, the surface of BNC scaffolds was modified with two proteins, fibronectin and collagen type I, using an effective bioconjugation method applying 1-cyano-4-dimethylaminopyridinium (CDAP) tetrafluoroborate as the intermediate catalytic agent. The effect of CDAP treatment on cell adhesion to the BNC surface is shown for human umbilical vein endothelial cells and the mouse mesenchymal stem cell line C3H10T1/2. In both cases, the surface modification increased the number of cells attached to the surfaces. In addition, the morphology of the cells indicated more healthy and viable cells. CDAP activation of bacterial nanocellulose is shown to be a convenient method to conjugate extracellular proteins

In this report we present experimental investigations of the THz radiation generated from a corrugated and a non-corrugated capillary with reflectors, using a femtosecond electron beam of LUCX accelerator at KEK, Japan. We discuss measurements of the radiation angular distributions and their comparison with Particle In Cell simulations, and also investigate an off-central propagation of the beam in the capillaries based on experimental measurements and simulations ...

Westerville, OH (PRWEB) August 30, 2008 -- Lake Shore Cryotronics, Inc. has expanded its filter product offering for far infrared and THz applications.

Ultra-broadband THz data recorded by air-plasma based systems, as well as synchrotron data will be presented for sensing and identification applications. The evolution from a precursor to home-made explosives can be nicely resolved using THz-TDS. Modelling these spectra by ab-initio DFT and molecular crystal simulation tools allows to identify the different inter- and intra-molecular character of the vibrational modes in this frequency range ...

Acquired drug resistance is a major factor limiting the effectiveness of targeted cancer therapies. Targeting tumors with kinase inhibitors induces complex adaptive programs that promote the persistence of a fraction of the original cell population, facilitating the eventual outgrowth of inhibitor-resistant tumor clones. We show that the addition of a newly identified CDK7/12 inhibitor, THZ1, to targeted therapy enhances cell killing and impedes the emergence of drug-resistant cell populations in diverse cellular and in vivo cancer models. We propose that targeted therapy induces a state of transcriptional dependency in a subpopulation of cells poised to become drug tolerant, which THZ1 can exploit by blocking dynamic transcriptional responses, promoting remodeling of enhancers and key signaling outputs required for tumor cell survival in the setting of targeted therapy. These findings suggest that the addition of THZ1 to targeted therapies is a promising broad-based strategy to hinder the ...

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graphene (483) metamaterials (352) advanced photonix (166) time domain spectroscopy (147) terahertz spectroscopy (122) quantum cascade lasers (120) Time domain Terahertz (104) Terahertz communication (80) CMOS (79) cancer detection (77) teraview (74) picometrix (66) terahertz astronomy (63) Dr. Daniel Mittleman (60) luna innovations (60) metasurfaces (57) pharmaceutical inspection (55) Continuous wave Terahertz (50) Weili Zhang (46) Mona Jarrahi (45) NASA (44) carbon nanotubes (44) patent (42) Advantest (41) Lake Shore Cryotronics (41) Rice University (39) Edmund Linfield (37) photonic crystals (37) airport security (36) algorithms (36) Jiaguang Han (35) MIT (35) commercialization of terahertz (35) plasmonics (35) quantum dots (35) surface plasmon polaritons (35) surface plasmons (35) Verisante (31) Darpa (29) terrorism (29) Don Arnone (28) Junichiro Kono (28) T-Gauge (28) metamaterial absorber (28) Toptica (27) Irl Duling (26) Jianquan Yao (26) Qing Hu (26) A. G. Davies (25) Yan Zhang (25) ...

This work fabricates a terahertz (THz) metamaterial device, whose structure consists of split ring resonator array/ plastic substrate/ Indium Tin Oxide (ITO) film/ liquid crystals/ ITO film/ plastic substrate. Experiment results show that the resonance of the THz metamaterial device can be enhanced as voltage is applied to the liquid crystals. The enhancement will be more significant as higher voltage applied. The resonance enhancement is attributed to the fact that the liquid crystals/ITO interfaces exhibit the large difference in terms of refractive index between the two materials in THz regime. The interfaces reflect the incident electromagnetic wave and cause the reflected wave to enhance the resonance of the metamaterials. As those frequency-tunable metamaterial devices show different resonant transmittance at different frequencies, which is undesired, the liquid crystals/ITO interfaces can improve those frequency-tunable metamaterial devices with a constant transmittance at different ...

A novel system of an optical vortex generation using an add/drop multiplexer incorporating with two nanoring resonators is proposed. Such a system is known as a PANDA ring resonator structure, in which the optical vortices (gradient optical fields/wells) can be generated and used to form the photon/atom trapping tools in the same way as the optical tweezers. By controlling some suitable parameters of the input and the control optical pulses, the intense optical vortices can be generated within the PANDA ring resonator, in which the trapped photons/atoms can move dynamically within the system. The trapping force occurrs and is formed by the combination between the gradient field and scattering photons, which we review. A transmitter and receiver can be formed within the same system (device), which is called a transceiver. Finally, the use of the PANDA ring resonator as a hybrid transceiver and repeater for nanocommunication is discussed ...

Our THz laboratory is centered on a terahertz time-domain spectroscopy system that provides picosecond THz pulses at a ~100 MHz repletion rate. These short pulses provide a spectral bandwidth from ~100 GHz to 4 THz. By monitoring position-dependent changes in the reflected or transmitted THz signal, we can build up an image of the material utilizing various contrast mechanisms. For example, in the time domain in a stratified medium, due to the Fresnel coefficient associated with refractive-index variations between the layers, the detected signal will be composed of various time-delayed echoes that are detected and then disentangled to identify layer thicknesses and refractive indices. Using advanced signal-processing techniques, we can obtain in some cases layer-thickness estimates down to ~20 microns. Such thicknesses are significantly below the expected resolution based on the available bandwidth.One of our laboratorys specific strength is our state-of-the-art ability to extract as much ...

Impact of sub-wavelength-size dielectric particles on Zenneck surface waves on planar metallic antennas is investigated at terahertz (THz) frequencies with THz near-field probe microscopy. Perturbations of the surface waves show the particle presence, despite its sub-wavelength size. The experimental configuration, which utilizes excitation of surface waves at metallic edges, is suitable for THz imaging of dielectric sub-wavelength size objects. As a proof of concept, the effects of a small strontium titanate rectangular particle and a titanium dioxide sphere on the surface field of a bow-tie antenna are experimentally detected and verified using full-wave simulations.

Research Perspectives Grant Information for EP/E053025/1 - Metamaterials For Subwavelength Imaging At Microwave Terahertz Infrared And Optical Frequencies - EPSRC

Two-dimensional networks of quantum dots connected by atomic bonds have an electronic structure that is distinct from that of arrays of quantum dots coupled by ligand molecules. We prepared atomically coherent two-dimensional percolative networks of PbSe quantum dots connected via atomic bonds. Here, we show that photoexcitation leads to generation of free charges that eventually decay via trapping. The charge mobility probed with an AC electric field increases with frequency from 150+/-15 cm|SUP|2|/SUP| V|SUP|-1|/SUP| s|SUP|-1|/SUP| at 0.2 terahertz to 260+/-15 cm|SUP|2|/SUP| V|SUP|-1|/SUP| s|SUP|-1|/SUP| at 0.6 terahertz. Gated four-probe measurements yield a DC electron mobility of 13+/-2 cm|SUP|2|/SUP| V|SUP|-1|/SUP| s|SUP|-1|/SUP|. The terahertz mobilities are much higher than for arrays of quantum dots coupled via surface ligands and are similar to the highest DC mobilities reported for PbSe nanowires. The terahertz mobility increases only slightly with temperature in the range of 15-290 K. The

Huifang Zhang,1 Xueqian Zhang,1,* Quan Xu,1 Qiu Wang,1 Yuehong Xu,1 Minggui Wei,1 Yanfeng Li,1 Jianqiang Gu,1 Zhen Tian,1 Chunmei Ouyang,1 Xixiang Zhang,2 Cong Hu,3 Jiaguang Han,1,5 and Weili Zhang1,4,6 1Center for Terahertz waves and College of Precision Instrument and Optoelectronics Engineering, Tianjin University and the Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin 300072, China 2Physical Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia 3Guangxi Key Laboratory of Automatic Detecting Technology and Instruments, Guilin University of Electronic Technology, Guilin 541004, China 4School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, USA 5e-mail: [email protected] 6e-mail: [email protected] *Corresponding author: [email protected] ...

Seeing that about 70% component of fresh biological tissues is water, many scientists try to use water models to describe the dielectric properties of biological tissues. The classical water dielectric models are Debye model, Double Debye model and Cole-Cole model. This work aims to determine a suitable model by comparing three models above with experimental data. These models are applied to fresh pork tissue. By means of least square method, the parameters of different models are fitted with the experimental data. Comparing different models on both dielectric function, the Cole-Cole model is verified the best to describe the experiments of pork tissue. The correction factor α of the Cole-Cole model is an important modification for biological tissues. So Cole-Cole model is supposed to be a priority selection to describe the dielectric properties for biological tissues in the terahertz range ...

Terahertz pulsed imaging (TPI) and Optical Coherence Tomography (OCT) are two powerful techniques allowing high quality three-dimensional images from withi

Many new applications are being proposed and developed for use in the terahertz (THz) frequency region. Similarly, many new materials are being characterized for possible use in this area. Nanostructured forms are of particular interest since they may yield desirable properties, but they remain especially challenging to characterize. This work focuses on the characterization of zinc oxide (ZnO) in bulk and nanowire form. A method for characterizing nanostructures at THz by use of a parallel-plate waveguide (PPWG) is presented. This method is novel in that it is simple, both in theory and practice, and does not require the use of complex measurement techniques such as differential and double modulated terahertz time-domain spectroscopy (THz-TDS). To enable easy evaluation of the quality of the result the maximum deviation in the material response measurement is presented. The dielectric properties of bulk and nanowire ZnO as determined by THz-TDS measurements are reported, and the electrical conductivity

To sustain the pace with immense prominence, interest in low-loss terahertz (THz) waveguides increases due to their particular applications in the multidisciplinary arena. This paper narrates a novel solid-core polymer-based square lattice micro-structured optical fiber (SL-MOF) with circular air...

TeraMetrixs T-Ray 5000 measurement system is one of the fastest terahertz systems available on the market. The T-Ray 5000 Intelligent Terahertz Control Unit is the heart of the system, monitoring and controlling all aspects of THz generation and detection. The TCU is paired with one of a variety of T-Gauge Sensor heads to create a complete system.. ...

Patients with long-standing ulcerative colitis (UC) and extensive Crohns colitis (CC) are at increased risk for dysplasia and colorectal cancer (CRC). Several studies have shown that UC extending proximal to the rectum, CC involving at least 1/3 of the colon, co-existence of primary sclerosing cholangitis, undetermined or unclassified colitis, family history of CRC and young age at diagnosis appear to be independent risk factors for inflammatory bowel disease (IBD) - related CRC. Therefore, screening and surveillance for CRC in IBD patients is highly recommended by international and national guidelines, whilst colonoscopy remains the unequivocal tool in order to detect potentially resectable dysplastic lesions or CRC at an early stage ...

region of the electromagnetic spectrum is shown in Fig.1.. In spite of the difficulties in the generation, transmission and detection of these tremendously high frequency signals 16, due to its undisputed benefits and hardly any ill- ...

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This blog is a non-commercial website. Whole content of this website is for inspirational purposes only. Photographs, that are published In this website and registered for the name of Özlem Devrim in Picasa Web Album, are personally shot by Özlem Devrim with the permission of their respective owners and/or copyright holders. Those photographs, that are published in Picasa Web Album and on this site in lower resolutions than actual, may be used for non-commercial purposes and relevant reference as to the actual source is provided.. Please also take note that all rights and/or copyrights for other photographs and visual materials, which are currently published on this site that are not shot by Özlem Devrim and therefore not published under Picasa Web Album, belongs to their respective owners. Such materials that are or may be reported as to infringe copyrights are removed forthright ...

Abstract The adsorption of four substances and their binary mixture is investigated via the terahertz time domain spectroscopy (THz-TDS). The selected unary compound (ethanol, acetone, ethyl acetate, and n-propyl acetate) and binary mixture (solution 1 is composed of ethanol and acetone, and solution 2 is composed of ethyl acetate and n-propyl acetate) exhibit different adsorption behaviors with varied polarities. In comparison with single component, solution 1 shows shorter adsorption equilibrium time, faster adsorption rate, and stronger adsorption capacity, which conform to a synergistic adsorption mechanism, while the competitive behavior is attributed to the slower adsorption in solution 2. In addition, the pseudo-second-order equation with terahertz parameter is used to assess the rate of binary component organics. The present results indicate a further understanding of multicomponent adsorption mechanisms ...

Located on a 300-acre forested campus in Houston, Rice University is consistently ranked among the nation s top 20 universities by U.S. News & World Report. Rice has highly respected schools of Architecture, Business, Continuing Studies, Engineering, Humanities, Music, Natural Sciences and Social Sciences and is home to the Baker Institute for Public Policy. With 3,978 undergraduates and 3,192 graduate students, Rice s undergraduate student-to-faculty ratio is just under 6-to-1. Its residential college system builds close-knit communities and lifelong friendships, just one reason why Rice is ranked No. 1 for lots of race/class interaction and No. 1 for quality of life by the Princeton Review. Rice is also rated as a best value among private universities by Kiplinger s Personal Finance ...

Der diesjährige Schwerpunkt des Kongresses liegt auf den Themen Trauma und Tumor in der Wirbelsäulenchirurgie. Wichtige wissenschaftliche Beiträge zu Tumorerkrankungen, degenerativen Erkrankungen, entzündlichen und metabolischen Erkrankungen, Verletzungen und Deformitäten aber auch zu innovativen Techniken erwarten die Besucherinnen und Besucher. Dabei steht ein fächerübergreifender Ansatz im Vordergrund, denn auch auf dem Gebiet der Wirbelsäulenheilkunde gilt es, Bewährtes zu erhalten und gleichzeitig neuen Behandlungsmethoden gegenüber offen zu sein. Dass die Deutsche Wirbelsäulengesellschaft diesen Anspruch ernst nimmt, zeigt auch die Zentren-Zertifizierung, die in diesem Jahr gestartet wurde. (Mehr in: Veranstaltungen - idw - Informationsdienst Wissenschaft). - Weiterlesen ...

Abstract: Device miniaturization requires an understanding of the dynamical response of materials on the nanometer scale. A great deal of experimental and theoretical work has been devoted to characterizing the excitation, charge, spin, and vibrational dynamics in a variety of novel materials, including carbon nanotubes, quantum dots, conducting polymers, inorganic semiconductors and molecular chromophores. We have developed state-of-the-art non-adiabatic molecular dynamics techniques and implemented them within time-dependent density functional theory in order to model the ultrafast photoinduced processes in these materials at the atomistic level, and in real time. Quantum dots (QD) are quasi-zero dimensional structures with a unique combination of molecular and bulk properties. As a result, QDs exhibit new physical properties such as carrier multiplication, which has the potential to greatly increase the efficiency of solar cells. The electron-phonon and Auger relaxation in QDs compete with ...

Due to ANKA-IRs innovative and influential design utilizing synchrotron edge radiation, characterization and optimization of this novel source is a major research theme of the ANKA infrared group. These studies also include the use of short electron bunches to produce stable coherent emission, resulting in a 5 orders of magnitude intensity enhancement in the far-infrared or terahertz range.. ...

Two papers from UCLA outline optical design and prototype development and evaluation of a new system of reflection-mode terahertz imaging for early, accurate, non-contact detection and study of corneal diseases in humans. The system reveals corneal-tissue water content and geometry while avoiding the problems caused by direct contact with the cornea required by earlier THz systems ...

Frequenz is one of the leading scientific and technological journals covering all aspects of RF-, Microwave-, and THz-Engineering. It is a peer-reviewed, bi-monthly published journal. Frequenz was first published in 1947 with a circulation of 7000 copies, focusing on telecommunications. Today, the major objective of Frequenz is to highlight current research activities and development efforts in RF-, Microwave-, and THz-Engineering throughout a wide frequency spectrum ranging from radio via microwave up to THz frequencies. RF-, Microwave-, and THz-Engineering is a very active area of Research & Development as well as of Applications in a wide variety of fields. It has been the key to enabling technologies responsible for phenomenal growth of satellite broadcasting, wireless communications, satellite and terrestrial mobile communications and navigation, high-speed THz communication systems. It will open up new technologies in communications, radar, remote sensing and imaging, in identification and ...

Light-matter interaction at the nanometer scale has turned into a very fast-growing field of research known as nano-optics. To highlight breakthroughs in the specific areas of nano-optics known as nanoplasmonics and metamaterials, the editors of the Optical Societys open-access journal Optical Materials Express have published a special Focus Issue on Nanoplasmonics and Metamaterials.

Noise-equivalent temperature (NET) is a measure of the sensitivity of a detector of thermal radiation in the infrared, terahertz or microwave portions of the electromagnetic spectrum. It is the amount of incident signal temperature that would be needed to match the internal noise of the detector such that the signal-to-noise ratio is equal to one. Often the spectrum of the NET is reported as a temperature per root bandwidth. A detector that measures power is often interested in the analogous noise-equivalent power (NEP). If a relation between intensity and temperature is well defined over the pass band, as in the case of a blackbody, then the NET simply scales with the NEP. If a detector is limited by either shot noise or Johnson noise then the NET can be decreased by using an increased integration time. The NET of flicker noise limited detectors can not be reduced by increased integration time. Typically uncooled bolometric detectors have NET figures of 30-200 mK. Cooled photon detecting ...

Currently, we focus on the next-generation integrated electronic and photonic circuits and systems to address various emerging and high-impact applications, including high-frequency and high-speed communications, sensing, imaging, and onchip bio-sensing and actuation. Everything which is integrated, small yet powerful and sophisticated, that pushes the boundary of science and engineering through innovations, often by exploring the spaces between traditionally different fields, interest us. Our research approach is to leverage concepts from different fields and merge them together to create high-performance systems. The broad themes of research are: 1.CMOS based biosensors: We are developing novel techniques that leverage CMOS chip-based technology to be used as diagnostic tools. The project involves conceptualizing new technologies for bio molecular detection on chip, design and biomolecular measurement of fabricated systems-on-chip. 2.Terahertz silicon chips: We are investigating new ...

Currently, we focus on the next-generation integrated electronic and photonic circuits and systems to address various emerging and high-impact applications, including high-frequency and high-speed communications, sensing, imaging, and onchip bio-sensing and actuation. Everything which is integrated, small yet powerful and sophisticated, that pushes the boundary of science and engineering through innovations, often by exploring the spaces between traditionally different fields, interest us. Our research approach is to leverage concepts from different fields and merge them together to create high-performance systems. The broad themes of research are: 1.CMOS based biosensors: We are developing novel techniques that leverage CMOS chip-based technology to be used as diagnostic tools. The project involves conceptualizing new technologies for bio molecular detection on chip, design and biomolecular measurement of fabricated systems-on-chip. 2.Terahertz silicon chips: We are investigating new ...

Our terahertz imaging systems make a good tool for 100% safe, non-invasive, in-vivo diagnostics for early cancers identification e.g. breast and skin cancers at early stages

We are interested in function and structure of biomolecular complexes such as proteins in membranes and fibrous proteins. The functions of biomolecules are based on molecular structures. The structures allow not only understanding the biological functions but also designing molecules useful for medicine and industry, such as drug and enzyme. However, it is generally difficult determine those structures defined by atomic coordinates. Thus we are developing new experimental technology for studying structure: nuclear magnetic resonance (NMR). This technology enables us to determine the structures of biomolecules not amenable to the other methods such as X-ray crystallography. The development of this method NMR requires expertise of various scientific fields, molecular biology, applied physics, physical chemistry and information technology. Therefore, we are conducting several research projects including the deveropment of high power terahertz light source and radio-frequency multiple pulses, ...

We demonstrate a regime in which matter-wave condensates of exciton-polaritons trapped in an elliptically shaped two-dimensional potential appear as a coherent mixture of ground and first-excited state of the quantum harmonic oscillator. This system resembles an optically controllable two-level system and produces near terahertz harmonic oscillations of the condensates center of mass along the major axis of the elliptical trapping potential. The population ratio between the two trap levels is tunable through the excitation laser power and is shown to follow Lotka-Volterra dynamics. Furthermore, we demonstrate coherence formation between two spatially displaced trapped condensate oscillators - the polaritonic analogue of Huygens clock synchronization for coupled condensate oscillators ...

With thanks to Prof. Timothy Korter and Dr. Michael Ruggiero for letting me flex some rendering chops (and extra to Tim for knowing what he wanted to see early on).. The cover (well, a cover - they cram quite a bit of artwork into their journal nowadays) for this months Angewandte Chemie highlights the correspondence between mechanical spring motion and the excitation of small alpha-helices by terahertz spectroscopy (a spectroscopic method capable of exciting small molecules at a low-enough frequency to excite the large-amplitude motions of, here, short peptides).. I was given a momentary pause on the way to coffee this morning listening to Chick Coreas Trilogy album when one of several of Brian Blades solos reminded me of what Art Taylor said of being a great drummer. Know the songs. Theres a similarity between drum solos and science graphics - you can either do whatever-the-hell you want as long as it looks/sounds great, or you can take the effort to make both reference strongly back to ...

Excitons are quasi-particles that form when Coulomb-interacting electrons and holes in semiconductors are bound into pair states. They have many features analogous to those of atomic hydrogen. Because of this, researchers are interested in exploring excitonic phenomena, from optical, quantum-optical and thermodynamic transitions to the possible condensation of excitons into a quantum-degenerate state. Excitonic signatures commonly appear in the optical absorption and emission of direct-gap semiconductor systems. However, the precise properties of incoherent exciton populations in such systems are difficult to determine and are the subject of intense debate. We review recent contributions to this discussion, and argue that to obtain detailed information about exciton populations, conventional experimental techniques should be supplemented by direct quasi-particle spectroscopy using the relatively newly available terahertz light sources. Finally, we propose a scheme of quantum-optical excitation ...

R. Paolella, de la Rosa, E., Sima, D. M., Dive, D., Durand-Dubief, F., Sappey-Marinier, D., Jeurissen, B., Sijbers, J., and Billiet, T., Decoding Multiple Sclerosis EDSS disability scores from MRI using Deep Learning, 38th Annual Scientific Meeting Congress of the European Society for Magnetic Resonance in Medicine and Biology. 2021. ...

Low temperature atomic layer deposition of films comprising SiCN or SiCON | Method for producing synthesis gas | Nanoarchitectured multi-component electrode materials and methods of making the same | Graphene-based plasmonic nano-antenna for terahertz band communication | Dielectric polyurethane film |

S. Emin et H. Nekka [r sum ,article]. La plasmonique Terahertz et optique: composants passifs et actifs - T. Akalin, E. Peytavit, G. Ducournau et J.-F. Lampin [r sum ,article]. Accroissement de labsorption lumineuse au sein de cellules solaires couches minces de silicium par addition de nanoparticules m ...

Hirashita H; Koch PM; Matsushita S; Takakuwa S; Nakamura M; Asada K; Liu HB; Urata U; Wang M-J; Wang W-H; Takahashi S; Tang Y-W; Chang H-H; Huang K; Morata O; Otsuka M; Lin K-Y; Tsai A-L; Lin Y-T; Srinivasan S; Martin-Cocher P; Pu J-Y; Kemper F; Patel N; Grimes P; Huang Y-D; Han C-C; Huang Y-R; Nishioka H; Lin C-CL; Zhang Q; Keto E; Burgos R; Chen M-T; Inoue M; Ho PTP, First-generation Science Cases for Ground-based Terahertz Telescopes , PASJ: 68(1), R1, Feb, 2016 [SCI] ( ADS , Fulltext ) ...

A prototype system from the MIT Media Lab can read through the first nine pages of a closed book. The time-gated terahertz spectral-imaging system, developed by Ramesh Raskar and colleagues in the Camera Culture Group, can identify individual letters.

Sciencetech Inc. has been designing and manufacturing optical spectroscopic instruments and solar simulators since 1985. Based in London, Ontario, Sciencetech manufacture modular spectroscopy equipment, solar simulators, photovoltaic testing equipment and far infrared Terahertz spectroscopy systems. Their extensive range of solar simulators are regarded as leaders in their class, offering standard and highly configurable steady-state and flash solar simulators.. Sciencetech is specialising in custom R&D projects, please see example of their success with challenging customer requirements here.. ...