Utilization of phononic-crystal reflective gratings in a layered surface acoustic wave device
Journal
Applied Physics Letters
Journal Volume
94
Journal Issue
10
Date Issued
2009
Author(s)
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.
SDGs
Type
journal article