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Published September 15, 2014 | Published
Journal Article Open

Acoustic Fresnel lenses with extraordinary transmission


We investigate numerically and experimentally highly efficient acoustic lenses based on the principle of extraordinary acoustic transmission. We study circular, flat lenses composed of perforated air channels. The geometry is similar to binary Fresnel lenses, and the lenses exploit several resonance mechanisms to enhance the transmission, such as Fabry–Perot resonances in the channels and cavity resonances on the lens surface. The proposed lenses are able to transmit up to 83% of the incident energy and generate sharp focusing with very high amplification (up to 16 dB experimentally). Furthermore, the resulting lenses are thinner than other designs providing similar performance, making them ideal candidates for application in acoustic imaging and medical diagnostics.

Additional Information

© 2014 AIP Publishing LLC. Received 4 August 2014; accepted 10 September 2014; published online 19 September 2014. The authors are grateful to Mythili Thevamaran for her help in the fabrication of the lenses. We acknowledge support from the US National Science Foundation (NSF) under Grant No. CMMI-1200319.

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