Filtering of elastic waves by opal-based hypersonic crystal.
We report experiments in which high quality silica opal films are used as three-dimensional hypersonic crystals in the 10 GHz range. Controlled sintering of these structures leads to well-defined elastic bonding between the submicrometer-sized silica spheres, due to which a band structure for elastic waves is formed. The sonic crystal properties are studied by injection of a broadband elastic wave packet with a femtosecond laser. Depending on the elastic bonding strength, the band structure separates long-living surface acoustic waves with frequencies in the complete band gap from bulk waves with band frequencies that propagate into the crystal leading to a fast decay.
Salasyuk
Alexey S
AS
Ioffe Physical-Technical Institute of the Russian Academy of Sciences, St. Petersburg, Russia.
Scherbakov
Alexey V
AV
Yakovlev
Dmitri R
DR
Akimov
Andrey V
AV
Kaplyanskii
Alexander A
AA
Kaplan
Saveliy F
SF
Grudinkin
Sergey A
SA
Nashchekin
Alexey V
AV
Pevtsov
Alexander B
AB
Golubev
Valery G
VG
Berstermann
Thorsten
T
Brüggemann
Christian
C
Bombeck
Michael
M
Bayer
Manfred
M