Realization of an ultrathin acoustic lens for subwavelength focusing in the megasonic range

Abstract In this study, we report the first experimental realization of an ultrathin (0.14λ, λ = 1.482 mm means wavelength at 1 MHz in the water medium) subwavelength focusing acoustic lens that can surpass the Rayleigh diffraction limit (0.61λ/NA, NA means numerical aperture). It is termed a Super-...

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Autores principales:	Jaeyub Hyun, Yong Tae Kim, Il Doh, Bongyoung Ahn, Kyungmin Baik, Se-Hwa Kim
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c63db240039d4ee0a4107a8a1d3dc5cc
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spelling	oai:doaj.org-article:c63db240039d4ee0a4107a8a1d3dc5cc2021-12-02T15:09:12ZRealization of an ultrathin acoustic lens for subwavelength focusing in the megasonic range10.1038/s41598-018-27312-52045-2322https://doaj.org/article/c63db240039d4ee0a4107a8a1d3dc5cc2018-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-27312-5https://doaj.org/toc/2045-2322Abstract In this study, we report the first experimental realization of an ultrathin (0.14λ, λ = 1.482 mm means wavelength at 1 MHz in the water medium) subwavelength focusing acoustic lens that can surpass the Rayleigh diffraction limit (0.61λ/NA, NA means numerical aperture). It is termed a Super-Oscillatory Acoustic Lens (SOAL), and it operates in the megasonic range. The SOAL represents an interesting feature allowing the achievement of subwavelength focusing without the need to operate in close proximity to the object to be imaged. The optimal layout of the SOAL is obtained by utilizing a systematic design approach, referred to here as topology optimization. To this end, the optimization formulation is newly defined. The optimized SOAL is fabricated using a photo-etching process and its subwavelength focusing performance is verified experimentally via an acoustic intensity measurement system. From these measurements, we found that the proposed optimized SOAL can achieve superior focusing features with a Full Width at Half Maximum (FWHM) of ~0.40λ/NA ≃ 0.84 mm (for our SOAL, NA = 0.707) with the transmission efficiency of 26.5%.Jaeyub HyunYong Tae KimIl DohBongyoung AhnKyungmin BaikSe-Hwa KimNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-12 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jaeyub Hyun Yong Tae Kim Il Doh Bongyoung Ahn Kyungmin Baik Se-Hwa Kim Realization of an ultrathin acoustic lens for subwavelength focusing in the megasonic range
description	Abstract In this study, we report the first experimental realization of an ultrathin (0.14λ, λ = 1.482 mm means wavelength at 1 MHz in the water medium) subwavelength focusing acoustic lens that can surpass the Rayleigh diffraction limit (0.61λ/NA, NA means numerical aperture). It is termed a Super-Oscillatory Acoustic Lens (SOAL), and it operates in the megasonic range. The SOAL represents an interesting feature allowing the achievement of subwavelength focusing without the need to operate in close proximity to the object to be imaged. The optimal layout of the SOAL is obtained by utilizing a systematic design approach, referred to here as topology optimization. To this end, the optimization formulation is newly defined. The optimized SOAL is fabricated using a photo-etching process and its subwavelength focusing performance is verified experimentally via an acoustic intensity measurement system. From these measurements, we found that the proposed optimized SOAL can achieve superior focusing features with a Full Width at Half Maximum (FWHM) of ~0.40λ/NA ≃ 0.84 mm (for our SOAL, NA = 0.707) with the transmission efficiency of 26.5%.
format	article
author	Jaeyub Hyun Yong Tae Kim Il Doh Bongyoung Ahn Kyungmin Baik Se-Hwa Kim
author_facet	Jaeyub Hyun Yong Tae Kim Il Doh Bongyoung Ahn Kyungmin Baik Se-Hwa Kim
author_sort	Jaeyub Hyun
title	Realization of an ultrathin acoustic lens for subwavelength focusing in the megasonic range
title_short	Realization of an ultrathin acoustic lens for subwavelength focusing in the megasonic range
title_full	Realization of an ultrathin acoustic lens for subwavelength focusing in the megasonic range
title_fullStr	Realization of an ultrathin acoustic lens for subwavelength focusing in the megasonic range
title_full_unstemmed	Realization of an ultrathin acoustic lens for subwavelength focusing in the megasonic range
title_sort	realization of an ultrathin acoustic lens for subwavelength focusing in the megasonic range
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/c63db240039d4ee0a4107a8a1d3dc5cc
work_keys_str_mv	AT jaeyubhyun realizationofanultrathinacousticlensforsubwavelengthfocusinginthemegasonicrange AT yongtaekim realizationofanultrathinacousticlensforsubwavelengthfocusinginthemegasonicrange AT ildoh realizationofanultrathinacousticlensforsubwavelengthfocusinginthemegasonicrange AT bongyoungahn realizationofanultrathinacousticlensforsubwavelengthfocusinginthemegasonicrange AT kyungminbaik realizationofanultrathinacousticlensforsubwavelengthfocusinginthemegasonicrange AT sehwakim realizationofanultrathinacousticlensforsubwavelengthfocusinginthemegasonicrange
_version_	1718387901736157184

Realization of an ultrathin acoustic lens for subwavelength focusing in the megasonic range

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