Phononic crystal plate with hollow pillars connected by thin bars

被引：45
作者：
Jin, Yabin [1 ,2 ]
Pennec, Yan [1 ]
Pan, Yongdong [2 ]
Djafari-Rouhani, Bahram [1 ]
机构：
[1] Univ Lille 1, Inst Elect Microelect & Nanotechnol, UMR CNRS 8520, F-59650 Villeneuve Dascq, France
[2] Tongji Univ, Sch Aerosp Engn & Appl Mech, 100 Zhangwu Rd, Shanghai 200092, Peoples R China
来源：
JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2017年 / 50卷 / 03期
关键词：
phononic crystal plate; whispering-gallery mode; waveguiding; acoustic metamaterial; BAND-STRUCTURE; ELASTIC-WAVES;
D O I：
10.1088/1361-6463/50/3/035301
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A new type of phononic crystal plate consisting of hollow pillars on a bar-connected plate is proposed. With respect to usual pillar based phononic crystal plates, the Bragg band gap can be tuned to be much wider and extended to a sub-wavelength region, and the low frequency gap can be moved to an extremely low frequency range. Such a structure can generate quadrapolar, hexapolar and octopolar whispering-gallery modes (WGMs) inside the band gaps with very high confinement and quality factors. By filling the hollow pillars with a liquid, these WGMs, together with additional localized compressional and solid-liquid coupling modes, can be tuned either by varying the inner radius of the pillars or controlling the height of the liquid. We discuss some possible functionalities of these phononic crystals for the purpose of sensing the acoustic properties of liquids, multiplexer and wireless communication.
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页数：8
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