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Nanomaterials 2019, 9(2), 180; https://doi.org/10.3390/nano9020180

Fabrication of Antireflective Nanostructures on a Transmission Grating Surface Using a One-Step Self-Masking Method

1
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, Sichuan 621900, China
2
Functional Nanomaterials Laboratory, Center for Micro/Nanomaterials and Technology and Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
3
IFSA (Inertial Fusion Sciences and Applications) Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China
*
Authors to whom correspondence should be addressed.
Received: 17 December 2018 / Revised: 20 January 2019 / Accepted: 23 January 2019 / Published: 1 February 2019
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Abstract

Suppression of Fresnel reflection from diffraction grating surfaces is very important for many optical configurations. In this work, we propose a simple method to fabricate subwavelength structures on fused-silica transmission grating for optical antireflection. The fabrication is a one-step self-masking reaction ion etching (RIE) process without using any masks. According to effective medium theory, random cone-shaped nanopillars which are integrated on the grating surface can act as an antireflective layer. Effects of the nanostructures on the reflection and transmission properties of the grating were investigated through experiments and simulations. The nanostructure surface exhibited excellent antireflection performance, where the reflection of the grating surface was suppressed to zero over a wide range of incident angles. Results also revealed that the etching process can change the duty cycle of the grating, and thus the diffraction orders if there are oblique lateral walls. The simulation results were in good agreement with the experimental ones, which verified our physical comprehension and the corresponding numerical model. The proposed method would offer a low-cost and convenient way to improve the antireflective performance of transmission-diffractive elements. View Full-Text
Keywords: antireflection; subwavelength structures; self-masking etching; transmission grating antireflection; subwavelength structures; self-masking etching; transmission grating
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Shao, T.; Tang, F.; Sun, L.; Ye, X.; He, J.; Yang, L.; Zheng, W. Fabrication of Antireflective Nanostructures on a Transmission Grating Surface Using a One-Step Self-Masking Method. Nanomaterials 2019, 9, 180.

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