Title :
Material loss effect on the dispersion of Bloch waves in phononic crystals
Author :
Moiseyenko, Rayisa P. ; Laude, Vincent
Author_Institution :
CNRS, Univ. de Franche-Comte, Besancon, France
Abstract :
Phononic crystals composed of lossy materials with viscosity constants proportional to the frequency are considered. Complex band structures are computed for such crystals using an extended plane wave expansion method. The effect of losses on both the real and the imaginary part of Bloch waves is investigated in the case of a two-dimensional square-lattice phononic crystal of holes in silicon. It is in particular found that losses limit the appearance of large group slownesses, or conversely small group velocities.
Keywords :
APW calculations; absorbing media; acoustic dispersion; elemental semiconductors; energy gap; phononic crystals; silicon; viscoelasticity; viscosity; Bloch wave dispersion; Si; band gap; complex band structures; conversely small group velocities; extended plane wave expansion method; group slownesses; lossy materials; material loss effect; silicon holes; two-dimensional square-lattice phononic crystal; viscoelasticity; viscosity constants; Acoustics; Crystals; Photonic band gap; Scattering; Silicon; Viscosity;
Conference_Titel :
Ultrasonics Symposium (IUS), 2010 IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4577-0382-9
DOI :
10.1109/ULTSYM.2010.5935652
