Micromechanical resonators based on silicon two-dimensional phononic crystals of square lattice

Nan Wang, Julius Ming Lin Tsai, Fu Li Hsiao, Bo Woon Soon, Dim Lee Kwong, Moorthi Palaniapan, Chengkuo Lee

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Phononic crystal (PnC) resonators of Bloch-mode resonance made by replacing periodically arranged two or three rows of air holes with one row of air holes on a two-dimensional (2-D) silicon slab with air holes of square lattice have been investigated. Piezoelectric aluminum nitride (AlN) film is employed as the interdigital transducers to transmit and detect acoustic waves, thus making the whole microfabrication process CMOS compatible. We also fabricate a PnC structure which has a stopband of 140 MHz < f < 195 MHz which agrees well with the simulation results. From our experimental results, we found that the two kinds of microfabricated PnC resonators have different optimization conditions in terms of resonant frequency and Q factor, as well as insertion loss, despite their similar design approach. As compared to PnC resonators of hexagonal lattice, the proposed Bloch-mode PnC resonators of square lattice demonstrated higher resonant frequency, higher Q factor, and a smaller device area. The promising acoustic characteristics may be further optimized for applications such as microfluidics, biomedical devices, and radio-frequency communications in the gigahertz range.

Original languageEnglish
Article number6095572
Pages (from-to)801-810
Number of pages10
JournalJournal of Microelectromechanical Systems
Volume21
Issue number4
DOIs
Publication statusPublished - 2012 Jan 1

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All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Electrical and Electronic Engineering

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