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Published on: February 26, 2015
Thickness dependences of acoustic bandgaps with different generation mechanisms in phononic crystals immersed in
Hwi Suk Kang1, Wan-Gu Kim1, Suk Wang Yoon1
1Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Koreakhs1714@skku.edu, kimwangu@skku.edu, swyoon@skku.ac.kr.
Abstract:
The thickness dependences of acoustic bandgaps were theoretically and experimentally investigated in two-dimensional phononic crystals (PCs) immersed in water. The acoustic pressure transmission coefficients were measured as a function of the PC thickness in order to understand the characteristics of the transmission loss through the PCs. The acoustic bandgaps can be classified into two types of generation mechanisms from the perspective of acoustic diffraction modes: Bragg bandgap and non-zeroth order diffraction (NZOD) bandgap. The NZOD bandgaps show larger transmission losses and shorter decay lengths with increasing PC thickness than the Bragg bandgaps.
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