• While low frequency sound in the range that humans can hear (up to 20 kilohertz) is easy to produce in either a random or orderly fashion, things get more difficult at the terahertz (trillions of hertz) frequencies that are the regime of potential phonon laser applications. (eurekalert.org)
  • Researchers at Caltech have overcome the problem by assembling a pair of microscopic cavities that only permit specific frequencies of phonons to be emitted. (eurekalert.org)
  • They can also tune the system to emit phonons of different frequencies by changing the relative separation of the microcavities. (eurekalert.org)
  • Brillouin scattering is a type of Raman scattering in which the difference frequency Ao) = Wphonon = (®inc ~ «»seal) corresponds to the acoustic branch of the phonon dispersion curves, with frequencies in the gigahertz (xlO'Hz) range, as was explained in Section 3.4.1. (texaspowerfulsmart.com)
  • Understanding how electrons and phonons relax in energy and momentum is one of the current goals in carbon nanotube spectroscopy as well as an important step toward developing novel electronic and optoelectronic devices based on carbon nanotubes. (rice.edu)
  • A phonon is the quantum mechanical description of an elementary vibrational motion in which a lattice of atoms or molecules uniformly oscillates at a single frequency . (wikipedia.org)
  • While normal modes are wave-like phenomena in classical mechanics, phonons have particle-like properties too, in a way related to the wave-particle duality of quantum mechanics. (wikipedia.org)
  • Light and sound are similar in various ways: they both can be thought of in terms of waves, and they both come in quantum mechanical units (photons in the case of light, and phonons in the case of sound). (eurekalert.org)
  • As an electron hops from one quantum well to the next, it produces a phonon. (eurekalert.org)
  • In physics , a phonon is a collective excitation in a periodic, elastic arrangement of atoms or molecules in condensed matter , specifically in solids and some liquids . (wikipedia.org)
  • The Ihick-film result (a) provides a bulk material response, namely, a strong central peak at zero frequency about 10 GHz wide, and a broad peak near 17 GHz attributed to longitudinal acoustic (LA) phonons. (texaspowerfulsmart.com)
  • So far, the Nottingham group has not demonstrated a true phonon lasing, but their system amplifies high-frequency sound in a way that suggests it could be it a key component in future phonon laser designs. (eurekalert.org)
more