Optically transparent microwave absorber based on water-based moth-eye structures

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oe-29-6-9190.pdf (5.42 MB)

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https://opg.optica.org/oe/fulltext.cfm?uri=oe-29-6-9190&id=449075

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https://doi.org/10.1364/OE.418220
 http://hdl.handle.net/11603/25088

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UMBC Computer Science and Electrical Engineering Department
UMBC Faculty Collection

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Author/Creator ORCID

https://orcid.org/0000-0002-7132-0103

Date

2021-03-09

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journal articles
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Citation of Original Publication

H. Kwon, G. D’Aguanno, and A. Alú, "Optically transparent microwave absorber based on water-based moth-eye structures," Opt. Express 29, 9190-9198 (2021).

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Abstract

We propose an approach to realize an optically transparent microwave absorber based on water-based moth-eye metamaterial structures. The absorber is made of a periodic array of properly shaped glass caps infiltrated with distilled water. Analytical calculations and numerical simulations show that the water-based metamaterial absorbs electromagnetic waves over a wide spectral band ranging from 4GHz to well above 120GHz, showing absorption levels close to 100% for incident radiation that ranges from normal to grazing angles, for both TE and TM polarizations. Yet, the structure is optically transparent, offering exciting opportunities in a variety of civil and military applications, such as for camouflage and shielding systems and in energy harvesting structures.