@article {Kim:2020:0736-2935:195,
title = "Acoustic metalens with broadband high transmission under consideration of visco-thermal losses and elastic deformation",
journal = "INTER-NOISE and NOISE-CON Congress and Conference Proceedings",
parent_itemid = "infobike://ince/incecp",
publishercode ="ince",
year = "2020",
volume = "261",
number = "6",
publication date ="2020-10-12T00:00:00",
pages = "195-199",
itemtype = "ARTICLE",
issn = "0736-2935",
url = "https://ince.publisher.ingentaconnect.com/content/ince/incecp/2020/00000261/00000006/art00025",
author = "Kim, Chankyu and Jeon, Wonju",
abstract = "We propose an acoustic metalens with broadband high transmission. The lens is a planar gradient-index lens consisting of cuboid-shaped unit structures with different refractive indices from 1.07 to 1.98. Each unit structure has a symmetric coiled channel whose cross-sectional area is
gradually varying. The cross-sectional area of channels is determined for the unit structures to have high transmittance in a broad frequency range. The transmittance of the unit structures and focusing capability of the designed metalens are investigated with consideration of visco-thermal
losses and elastic deformation of the structures. The transmittance of the unit structure is higher than 0.8 in a target frequency range of 2.5-5.5 kHz and the acoustic intensity is significantly amplified by the lens in the frequency range.",
}