Achromatic acoustic gradient-index phononic crystal lens for broadband focusing

The aim of this study is to realize an achromatic acoustic gradient-index (GRIN) phononic crystal (PC) lens system with a spatially invariant focal length over a broad operating frequency range. To this end, we propose an approach of introducing thin achromatic coating layers that can be easily asse...

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Published in:Applied physics letters 2020-06, Vol.116 (23)
Main Authors: Hyun, Jaeyub, Cho, Wan-Ho, Park, Choon-Su, Chang, Jiho, Kim, Miso
Format: Article
Language:English
Subjects:
Acoustic imaging
Acoustics
Applied physics
Broadband
Coating
Energy harvesting
Frequency ranges
Lenses
Thin films
Topology optimization
Wireless power transmission
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cited_by cdi_FETCH-LOGICAL-c257t-1c506d22309a18c086de2e243083720e684e35b9c40772536f8c09889bfb793d3
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container_issue 23
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container_title Applied physics letters
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creator Hyun, Jaeyub
Cho, Wan-Ho
Park, Choon-Su
Chang, Jiho
Kim, Miso
description The aim of this study is to realize an achromatic acoustic gradient-index (GRIN) phononic crystal (PC) lens system with a spatially invariant focal length over a broad operating frequency range. To this end, we propose an approach of introducing thin achromatic coating layers that can be easily assembled into the front and rear regions of the acoustic GRIN PC lens. A systematic design method based on topology optimization (TO) is developed to inversely design the achromatic coating components. The topology-optimized achromatic coating components are fabricated using 3D printing and coupled with the acoustic GRIN PC lens for acoustic characterization. Both numerical simulation and experimental characterization demonstrate the achromatic focusing capabilities of the GRIN PC lens with the designed achromatic coating layers in a wide range of frequencies (2.5 kHz–5.5 kHz). The proposed concept of applying achromatic coating layers along with the TO-based design method is expected to provide remarkable versatility to design GRIN PC lens-based applications such as energy harvesting, acoustic imaging, and acoustic wireless power transfer in broadband operation.
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source American Institute of Physics:Jisc Collections:Transitional Journals Agreement 2021-23 (Reading list); American Institute of Physics
subjects Acoustic imaging
Acoustics
Applied physics
Broadband
Coating
Energy harvesting
Frequency ranges
Lenses
Thin films
Topology optimization
Wireless power transmission
title Achromatic acoustic gradient-index phononic crystal lens for broadband focusing
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