Results 141 to 150 of about 1,659 (185)
Some of the next articles are maybe not open access.
PHONON-PHONON INTERACTION IN CRYSTALS
1963Abstract : The generation, propagation and interaction of phonons with emphasis on the phonon interaction in crystals were investigated. Several phonon phonon interaction processes in X-cut quartz, silicon and germanium were investigated. These involve forward traveling wave, backward traveling wave, frequency up conversion and harmonic generation ...
Stephen Wanuga, Walter Brouillette
openaire +1 more source
Phonon focusing in piezoelectric crystals
Physical Review B, 1987Phonon focusing in dielectric crystals depends upon the second-order elastic constants [1]. These constants determine the shape of the phase and group-velocity surfaces for each of the three modes and thus the phonon focusing properties of the crystal.
, Every, , McCurdy
openaire +2 more sources
Phonon focusing in cubic crystals
Physical Review B, 1985The nature of the phonon intensity pattern associated with low-temperature heat-pulse propagation is examined theoretically for a wide range of cubic crystals. In general, huge anisotropies in the thermal flux are predicted due to phonon focusing. The phonon-focusing patterns of cubic crystals divide naturally into two major groups, as distinguished by
, Hurley, , Wolfe
openaire +2 more sources
Nature, 1972
Thermodynamics of Crystals. By Duane C. Wallace. Pp. xviii + 484. (Wiley: London and New York, April 1972.) £8.85.
openaire +1 more source
Thermodynamics of Crystals. By Duane C. Wallace. Pp. xviii + 484. (Wiley: London and New York, April 1972.) £8.85.
openaire +1 more source
Phonon-Phonon and Phonon-Defect Scattering in 4He Crystals
1993The thermal conductivity measurements were made in pure 4He and 4He+3He liquid and solid mixtures under pressure up to 84 atm.The data cover the temperature range down to 0,4 K and include the results of investigations of recovery processes in plastically deformed crystals.The importance of different phonon relaxation mechanisms is estimated from the ...
L. P. Mezhov-Deglin, A. A. Levchenko
openaire +1 more source
Fundamental Properties of Phononic Crystal
2016Phononic crystals are periodic composite structures where the elastic and acoustic properties display a periodic variation in space. They are in general constituted by a periodic array of inclusions in a matrix. Due to their periodicity, they can exhibit absolute band gaps in which the propagation of elastic waves is prohibited in any direction of the ...
Pennec, Yan, Djafari-Rouhani, Bahram
openaire +2 more sources
Polarization States in 2D Phononic Crystals and Phononic Crystal Waveguides
2010We investigate, using the Plane Wave Expansion method and an energy balance criterion, the polarization states of elastic waves in a two dimensional phononic crystal made of vacuum holes in a silicon host matrix. Pure modes can be identified for the out of plane polarization while a continuous variation of the in-plane polarization with the Bloch wave ...
Younes Achaoui +3 more
openaire +1 more source
Phononic Crystal with Adaptive Connectivity
Advanced Materials, 2013The band structure of a phononic crystal can be controlled by tuning the mechanical stiffness of the links connecting its constituting elements. The first implementation of a phononic crystal with adaptive connectivity is obtained by using piezoelectric resonators as variable stiffness elements, and its wave-propagation properties are experimentally ...
Bergamini, Andrea +5 more
openaire +3 more sources
Phonon–polariton in two-dimensional piezoelectric phononic crystals
Physics Letters A, 2008zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Yang, Ming-Yi +2 more
openaire +2 more sources
Phonon Transport in Disordered 2D Phononic Crystals
2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), 2019Phonon transport in 2D phononic crystals has attracted attention due to the possibility to control (a) the heat flow, i.e., achieving directional phonon transport, that is of relevance for diode-like behaviour, and (b) controlling the thermal conductivity over orders of magnitude, which is of interest for thermoelectric applications.
Sledzinska, Marianna +6 more
openaire +2 more sources