Optically transparent microwave absorber based on water-based moth-eye structures
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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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Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
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This item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
Subjects
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.