Wide field-of-hearing metalens for aberration-free sound capture

Dongwoo Lee, Beomseok Oh, Jeonghoon Park, Seong-Won Moon, Kilsoo Shin, Sea-Moon Kim and Junsuk Rho ()
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Dongwoo Lee: Pohang University of Science and Technology (POSTECH)
Beomseok Oh: Pohang University of Science and Technology (POSTECH)
Jeonghoon Park: Pohang University of Science and Technology (POSTECH)
Seong-Won Moon: Pohang University of Science and Technology (POSTECH)
Kilsoo Shin: Pohang University of Science and Technology (POSTECH)
Sea-Moon Kim: Korea Research Institute of Ships & Ocean Engineering (KRISO)
Junsuk Rho: Pohang University of Science and Technology (POSTECH)

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Metalenses are instruments that manipulate waves and have exhibited remarkable capabilities to date. However, an important hurdle arises due to the severe hampering of the angular response originating from coma and field curvature aberrations, which result in a loss of focusing ability. Herein, we provide a blueprint by introducing the notion of a wide field-of-hearing (FOH) metalens, designed particularly for capturing and focusing sound with decreased aberrations. Employing an aberration-free planar-thin metalens that leverages perfect acoustic symmetry conversion, we experimentally realize a robust wide FOH capability of approximately 140∘ in angular range. Moreover, our metalens features a relatively short focal length, enabling compact implementation by reducing the aperture-to-hearing plane distance. This is beneficial for space-efficient source-tracking sound sensing. Our strategy can be used across various platforms, potentially including energy harvesting, monitoring, imaging, and communication in auditory, ultrasonic, and submerged environments.

Date: 2024
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DOI: 10.1038/s41467-024-47050-9

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