基于金属铑和二氧化硅材料的紫外线超宽带吸收器  

Ultra-wideband UV Absorber Based on Rhodium Metal and Silica Materials

作　　者：樊浩田 薛文瑞[1] 陈宇婷 孟凡义 李昌勇[2,3] Fan Haotian;Xue Wenrui;Chen Yuting;Meng Fanyi;Li Changyong(College of Physics and Electronic Engineering,Shanxi University,Taiyuan 030006,Shanxi,China;State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Laser Spectroscopy,Shanxi University,Taiyuan 030006,Shanxi,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,Shanxi,China)

机构地区：[1]山西大学物理电子工程学院,山西太原030006 [2]山西大学激光光谱研究所量子光学与光量子器件国家重点实验室,山西太原030006 [3]山西大学极端光学协同创新中心,山西太原030006

出　　处：《中国激光》2024年第2期195-203,共9页Chinese Journal of Lasers

基　　金：国家自然科学基金(61378039,61575115);国家基础科学人才培养基金(J1103210)。

摘　　要：设计了一种基于金属铑(Rh)和二氧化硅(SiO_(2))材料的紫外线吸收器,其单元结构由Rh衬底、SiO_(2)电介质层和Rh图案层构成。采用有限元方法(FEM)分析了该吸收器的吸收特性与入射波波长、入射角、方位角和几何结构参数的依赖关系。结果表明,该紫外线吸收器通过表面等离子体共振效应达到吸收目的。通过调整单元结构的几何参数,可以调整该吸收器的吸收特性。由于结构的旋转对称性,该吸收器具有偏振不敏感性。在所有结构参数均采用最优值的情况下,当入射角为0°~45°、波长为200~400 nm时,均能获得90%以上的高吸收率。吸收率为95%的波段为250~300 nm及325~400 nm。所设计的紫外线超宽带吸收器具有优良的吸收性能。采用的Rh金属为紫外波段内吸收材料的选择提供了新的选项。研究结果为紫外线吸收器的设计、制作和应用提供了参考。Objective The principal method currently employed by researchers to prevent damage to the human body and materials from ultraviolet(UV)radiation involves chemical protection strategies.With the development of metamaterials and nanotechnology,physical methods have been developed for protection against ultraviolet radiation.UV absorbers based on artificial microstructures can be used to absorb UV radiation and exhibit important applications in UV detection,sensing,and protection.Owing to limitations in materials and manufacturing processes,research on UV absorbers is relatively slow.Therefore,improved surface plasma materials and processes are sought to improve the absorption of UV absorbers.Metallic rhodium(Rh)is an excellent surface plasmon material.Compared with other noble metals,the surface of Rh can excite surface plasmon polaritons(SPPs)and exhibits a strong surface plasmon response in the UV band.Rh exhibits excellent stability in various environments.In this study,a UV absorber is designed using Rh metal and dioxide(SiO_(2))material to absorb ultraviolet radiation.Methods The unit structure of the UV absorber designed in this study consists of a Rh substrate,SiO_(2) dielectric layer,and Rh pattern layer.The finite element method(FEM)is used to analyze the dependence of the absorption characteristics of the absorber on the incident wavelength,incidence angle,azimuth angle,and geometrical structure parameters.Using the Comsol Multiphysics 5.4 software for modeling,the incident/reflection ports are set above the unit structure,the transmission ports are set below the unit structure,and the periodic boundary conditions are set in the horizontal direction of the unit structure.The field distribution is obtained by simulating the interaction between the incident ultraviolet radiation and absorber.The absorptivity and relative impedance are obtained from the reflection and transmission coefficients,respectively.Results and Discussions The optimal structural parameters of the absorber designed in this study are as

关 键 词：光学器件 紫外线吸收器 宽带 RH 表面等离子体共振 

分 类 号：O431[机械工程—光学工程]