Terahertz broadband anti-reflection moth-eye structures and its applications

Kuniaki Konishi

doi:10.1117/12.2681531

4 October 2023 Terahertz broadband anti-reflection moth-eye structures and its applications

Kuniaki Konishi

Proceedings Volume 12683, Terahertz Emitters, Receivers, and Applications XIV; 1268305 (2023) https://doi.org/10.1117/12.2681531
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

Signal loss due to Fresnel reflections on optical elements is a common issue in the terahertz frequency region, particularly in materials with high refractive indices, such as silicon and sapphire. Moth-eye structures are an effective solution to this problem, as they serve as broad-spectrum antireflection methods. However, creating sub-millimeter-sized protrusions for terahertz waves has been a challenge using conventional methods. Recently, ultrashort-pulsed laser processing has emerged as a precise technique for 3D microstructure production. We have been developing this technology and have achieved moth-eye structures with sub-wavelength precision, specifically tailored to cater to terahertz wavelengths. This presentation will focus on fabricating broadband terahertz anti-reflection moth-eye structures using ultrashort-pulsed lasers. Our design demonstrates almost total transmittance near 100 GHz and maintains this over 1 THz. We have achieved success in using this method to create large moth-eye structures with a diameter of 300mm, which have been utilized for radio astronomy purposes. These laser-fabricated microstructures hold significant promise in terahertz wave control.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Kuniaki Konishi "Terahertz broadband anti-reflection moth-eye structures and its applications", Proc. SPIE 12683, Terahertz Emitters, Receivers, and Applications XIV, 1268305 (4 October 2023); https://doi.org/10.1117/12.2681531

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