Phonon dispersion in hypersonic two-dimensional phononic crystal membranes

被引：80

作者：

Graczykowski, B. ^{[1
]}

Sledzinska, M. ^{[1
]}

Alzina, F. ^{[1
]}

Gomis-Bresco, J. ^{[1
]}

Reparaz, J. S. ^{[1
]}

Wagner, M. R. ^{[1
]}

Torres, C. M. Sotomayor ^{[1
,2
]}

机构：

[1] ICN2 Inst Catala Nanociencia & Nanotecnol, Bellaterra 08193, Barcelona, Spain

[2] ICREA, Barcelona 08010, Spain

来源：

PHYSICAL REVIEW B | 2015年 / 91卷 / 07期

关键词：

BAND-GAPS; WAVES; SILICON;

D O I：

10.1103/PhysRevB.91.075414

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate experimentally and theoretically the acoustic phonon propagation in two-dimensional phononic crystal membranes. Solid-air and solid-solid phononic crystals were made of square lattices of holes and Au pillars in and on 250 nm thick single crystalline Si membrane, respectively. The hypersonic phonon dispersion was investigated using Brillouin light scattering. Volume reduction (holes) or mass loading (pillars) accompanied with second-order periodicity and local resonances are shown to significantly modify the propagation of thermally activated GHz phonons. We use numerical modeling based on the finite element method to analyze the experimental results and determine polarization, symmetry, or three-dimensional localization of observed modes.

引用

页数：8

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