Fabrication and characterization of TiO&lt;inf&gt;2&lt;/inf&gt; antireflection coatings with gradient-index

Tian, Li; Li, Ling; Ban, Chuncheng; Wu, Min

doi:10.1109/nems.2017.8016990

Cited by 1 publication

(1 citation statement)

References 23 publications

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“…Therefore, Fresnel reflection-free optical interfaces are very desirable for DOEs used in high-power laser systems. Over the past years, various antireflection technologies have been developed, which can be divided into two categories; antireflective (AR) coatings with a single-layer film or multi-layer thin-film stacks [ 9 , 10 , 11 , 12 , 13 ] and AR subwavelength structures (SWSs) with graded refractive index profiles [ 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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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.

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