Temperature effects on the band gaps of Lamb waves in a one-dimensional phononic-crystal plate (L)

This study investigates the temperature-tuned band gaps of Lamb waves in a one-dimensional phononic-crystal plate, which is formed by alternating strips of ferroelectric ceramic Ba0.7Sr0.3TiO3 and epoxy. The sensitive and continuous temperature-tunability of Lamb wave band gaps is demonstrated using the analyses of the band structures and the transmission spectra. The width and position of Lamb wave band gaps shift prominently with variation of temperature in the range of 26 degrees C-50 degrees C. For example, the width of the second band gap increases from 0.066 to 0.111 MHz as the temperature is increased from 26 degrees C to 50 degrees C. The strong shift promises that the structure could be suitable for temperature-tuned multi-frequency Lamb wave filters. (C) 2011 Acoustical Society of America. [DOI: 10.1121/1.3543970]