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Polymer-coated moth-eye hybrid structure for broadband antireflection in the terahertz region

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Abstract

A hybrid antireflective structure (ARS) is proposed for enhancing the transmittance of terahertz (THz) waves. This hybrid ARS was made by attaching a polymer-based two-layer coating onto a moth-eye structure on a silicon (Si) substrate. The measured power reflectance of this hybrid ARS remained below 6% in the frequency range of 0.6–2.5 THz, corresponding to the simulated results. The total power reflectance from 0.1 to 2.5 THz was 20% that of the unprocessed Si surface. Besides exhibiting a broadband AR characteristic, this hybrid ARS inherited the cleanable flat surface from the coating structure, which also acts as a protective shield for the moth-eye structures. This high-transmittance, cleanable, flat antireflective surface can not only improve the performance of numerous THz components but also promote the applications of THz waves in daily life.

© 2021 Optical Society of America

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Supplementary Material (1)

NameDescription
Supplement 1       SN ratio of THz signal and noise

Data Availability

Data underlying the results of this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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