1. Splitting of self-collimated beams in two-dimensional sonic crystals.
- Author
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Li, Bo, Guan, Jun-Jun, Deng, Ke, and Zhao, Heping
- Subjects
- *
CRYSTALS , *ACOUSTIC radiation , *WAVELENGTHS , *GAUSSIAN beams , *CRYSTALLOGRAPHY - Abstract
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°-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. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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