Enhancing monochromatic multipole emission by a subwavelength enclosure of degenerate Mie resonances

被引：33

作者：

Zhao, Jiajun ^{[1
,2
,3
]}

Zhang, Likun ^{[2
,3
]}

Wu, Ying ^{[1
]}

机构：

[1] KAUST, Div Comp Elect & Math Sci & Engn, Thuwal 239556900, Saudi Arabia

[2] Univ Mississippi, Nat Ctr Phys Acoust, University, MS 38677 USA

[3] Univ Mississippi, Dept Phys & Astron, University, MS 38677 USA

来源：

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA | 2017年 / 142卷 / 01期

关键词：

INHIBITED SPONTANEOUS EMISSION; CAVITY;

D O I：

10.1121/1.4990010

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

Sound emission is inefficient at low frequencies as limited by source size. This letter presents enhancing emission of monochromatic monopole and multipole sources by enclosing the source with a subwavelength circular enclosure filled of an anisotropic material of a low radial sound speed. The anisotropy is associated with an infinite tangential density along the azimuth. Numerical simulations show that emission gain is produced at frequencies surrounding degenerate Mie resonant frequencies of the enclosure, and meanwhile the radiation directivity pattern is well preserved. The degeneracy is theoretically analyzed. A realization of the material is suggested by using a space-coiling structure. (C) 2017 Acoustical Society of America

引用

页码：EL24 / EL29

页数：6

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