Acoustic lens: A thin plate with quasi-periodic array of holes
- Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, China
- Received 19 November 2013, Accepted 2 January 2014, Available online 29 January 2014
- by E.L. Ivchenko
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A thin steel plate with quasi-periodic array of holes is fabricated to serve as a lens.
Subwavelength hotspots are observed in the post-evanescent field of the plate.
Imaging of a point source with good resolution at different positions is exhibited.
A thin steel plate with quasi-periodic array of holes is fabricated, which is demonstrated to be able to function as an acoustic lens. With either a plane wave or a point source in object space, hotspots with the smallest size up to one-fifth wavelength are observed in the post-evanescent field regime in image space. Imaging of a point source with good resolution at different positions is also exhibited. The singular field distributions originate from the interference of the diffractive beams specific to quasi-periodic structures, which generates distinct and plentiful diffractive patterns.