Optimizing broadband antireflection with Au micropatterns: a combined FDTD simulation and two-beam LIL approach

Author:

Saeed Sadaf,Zia Ali1,Liu Ri,Liu Dongdong,Cao Liang,Wang Zuobin

Affiliation:

1. Beijing University of Technology

Abstract

Broadband antireflection (AR) is highly significant in a wide range of optical applications, and using a gold (Au) micropattern presents a viable method for controlling the behavior of light propagation. This study investigates a novel, to the best of our knowledge, methodology to achieve broadband AR properties in Au micropatterns. It employed the three-dimensional finite-difference time-domain (FDTD) method to simulate and optimize the design of micropatterns. In contrast, the fabrication of Au micropatterns was carried out using two-beam laser interference lithography (LIL). The fabricated Au micropatterns were characterized by a scanning electron microscope (SEM) and spectroscope to validate their antireflection and transmission properties and evaluate their performance at various wavelengths. The optimized Au micropatterns had a high transmittance rating of 96.2%. In addition, the device exhibits a broad-spectrum antireflective property, covering wavelengths ranging from 400 to 1100 nm. The simulation data and experimentally derived results show comparable patterns. These structures can potentially be employed in many optical devices, such as solar cells and photodetectors, whereby achieving optimal device performance reduced reflection and enhanced light absorption.

Funder

National Key Research and Development Program of China

Jilin Provincial Science and Technology Program

Science and Technology Program of Changchun City

Horizon Europe Program

111 Project

Publisher

Optica Publishing Group

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