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Proceedings Paper

Band gaps and waveguiding of Lamb waves in stubbed phononic plates
Author(s): Tsung-Tsong Wu; Tzung-Chen Wu; Jin-Chen Hsu
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Paper Abstract

Lamb wave propagation in a surface-stubbed phononic-crystal plate is investigated numerically and experimentally. Results show that the complete band gaps and flat bands of elastic waves exist in the structure. By using laser ultrasonic techniques, the experimental measurements demonstrate the evidence of the band gaps and resonances at the band-edge frequencies. In addition, a frequency range associated with the deaf bands is found. Based on the verified band gaps and deaf bands, waveguiding effects in the structure with a line defect are characterized. Furthermore, a sharply bent waveguide is then designed and fabricated to experimentally demonstrate frequency selection for broadband Lamb waves.

Paper Details

Date Published: 16 February 2009
PDF: 12 pages
Proc. SPIE 7223, Photonic and Phononic Crystal Materials and Devices IX, 72230G (16 February 2009); doi: 10.1117/12.816986
Show Author Affiliations
Tsung-Tsong Wu, National Taiwan Univ. (Taiwan)
Tzung-Chen Wu, National Taiwan Univ. (Taiwan)
Jin-Chen Hsu, National Taiwan Univ. (Taiwan)

Published in SPIE Proceedings Vol. 7223:
Photonic and Phononic Crystal Materials and Devices IX
Ali Adibi; Shawn-Yu Lin; Axel Scherer, Editor(s)

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