Abstract
A sharp bending scheme for the self-collimation of acoustic waves is proposed by simply truncating the sonic crystals. An all-angle and wide-band 90°-bending wave guide is demonstrated with nearly perfect transmissions for Gaussian beams at a wide range of incident angles. A 90°-bended imaging for a point source with a subwavelength resolution of 0.37 λ0 is also realized by the proposed structure. These results will find applicability in the manipulation of acoustic waves by sonic crystals.
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