Splitting of self-collimated beams in two-dimensional sonic crystals

被引：17

作者：

Li, Bo ^{[1
]}

Guan, Jun-Jun ^{[1
]}

Deng, Ke ^{[1
]}

Zhao, Heping ^{[1
]}

机构：

[1] Jishou Univ, Dept Phys, Jishou 416000, Hunan, Peoples R China

来源：

JOURNAL OF APPLIED PHYSICS | 2012年 / 112卷 / 12期

基金：

中国国家自然科学基金;

关键词：

PHOTONIC CRYSTALS; WAVE-GUIDES;

D O I：

10.1063/1.4770471

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

An easy-to-implement scheme to split self-collimated acoustic beams in sonic crystals (SCs) is proposed by introducing line-defects into SCs, by which an incoming self-collimated beam can be split into a 90 degrees-bended one and a transmitted one with an arbitrary power ratio by adjusting the value of defect size. An all-angle and wide-band splitting instrument is demonstrated with nearly perfect efficiency (more than 90%) for Gaussian beams at a wide range of incident angles. Splitting effect for a point source as input is also realized, in which two subwavelength images of the source, i.e., a bended one and a transmitted one, are formed by our designed splitting structure. Finally, the proposed one-to-two splitting scheme is generalized to one-to-N (N>2) cases by inserting more rows of line defects into the SC. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4770471]

引用

页数：5

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