TITLE

Utilization of phononic-crystal reflective gratings in a layered surface acoustic wave device

AUTHOR(S)
Tsung-Tsong Wu; Wei-Shan Wang; Jia-Hong Sun; Jin-Chen Hsu; Yung-Yu Chen
PUB. DATE
March 2009
SOURCE
Applied Physics Letters;3/9/2009, Vol. 94 Issue 10, pN.PAG
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In this paper, a design that combines two-port surface acoustic wave (SAW) devices and phononic crystals (PCs) acting as reflected gratings is demonstrated. Finite-difference time-domain method is used to analyze SAWs encountering the PC and optimize the design. A layered ZnO/Si SAW device and a square lattice PC composing of cylindrical holes on silicon were fabricated. With the PC of 15-layer cylinders, experimental insertion loss shows a 7 dB improvement at 212 MHz at central frequency. In addition, the size of gratings is reduced significantly as compared to the traditional gratings with hundreds of metal strips.
ACCESSION #
37043691

 

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