Asymptotic theory of bimodal quarter-wave impedance matching for full mode-converting transmission

被引：28
作者：
Yang, Xiongwei [1 ]
Kim, Yoon Young [2 ,3 ]
机构：
[1] Seoul Natl Univ, Plus Transformat Program Creat Mech & Aerosp Engi, 1 Gwanak Ro, Seoul 08826, South Korea
[2] Seoul Natl Univ, Sch Mech & Aerosp Engn, 1 Gwanak Ro, Seoul 08826, South Korea
[3] Seoul Natl Univ, Inst Adv Machines & Design, 1 Gwanak Ro, Seoul 08826, South Korea
来源：
PHYSICAL REVIEW B | 2018年 / 98卷 / 14期
基金：
新加坡国家研究基金会;
关键词：
ELASTIC-WAVES; LAYERS; METAMATERIAL; TRANSDUCERS;
D O I：
10.1103/PhysRevB.98.144110
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A quarter-wave impedance-matching element inserted between two dissimilar media allows full-power transmission, but this phenomenon occurs only when the mode of the incident and transmitted waves remains unaltered, either longitudinal (L) or transverse (T). Here, we report our asymptotic bimodal quarter-wave impedance-matching theory for full-power mode-converting transmission. It requires that two coupled quarter waves should be simultaneously formed inside a matching element possessing specific anisotropy for phase matching and L-to-T (T-to-L) mode conversion. Simulations using designed metamaterial matching elements show that nearly full mode-converting transmissions can be realized within a single medium or between two dissimilar media. We expect that our theory can be critically useful for medical and industrial ultrasonic applications wherever highly efficient mode conversion and high-powered transverse waves are required.
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页数：7
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