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Open Access Nano Express

Localization of acoustic modes in periodic porous silicon structures

Zorayda Lazcano*, Octavio Meza and Jesús Arriaga

Author Affiliations

Instituto de Física, Benemérita Universidad Autónoma de Puebla, 18 Sur y San Claudio, Edif. 110-A, Puebla 72570, México

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Nanoscale Research Letters 2014, 9:419  doi:10.1186/1556-276X-9-419

Published: 21 August 2014

Abstract

The propagation of longitudinal acoustic waves in multilayer structures based on porous silicon and the experimental measurement of acoustic transmission for the structures in the gigahertz range are reported and studied theoretically. The considered structures exhibit band gaps in the transmission spectrum and these are localized modes inside the band gap, coming from defect layers introduced in periodic systems. The frequency at which the acoustic resonances appear can be tuned by changing the porosity and/or thickness of the defect layer.

Keywords:
Porous silicon; Localized defects; Phononic crystals; Acoustic transmission