基于Bi_(1.5)Sb_(0.5)Te_(1.8)Se_(1.2)材料的多凹槽型紫外线吸收器  

Multigroove-Type Ultraviolet Absorber Based on Bi_(1.5)Sb_(0.5)Te_(1.8)Se_(1.2) Material

作　　者：张敬 薛文瑞[1] 张晨 陈宇婷 李昌勇[2,3] Zhang Jing;Xue Wenrui;Zhang Chen;Chen Yuting;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 Optical,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》2022年第17期144-152,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Bi_(1.5)Sb_(0.5)Te_(1.8)Se_(1.2)材料的能对紫外线实现宽角度吸收的多凹槽型吸收器。采用有限元方法对该吸收器的吸收机制以及吸收特性与入射波波长、入射角度以及结构参数的依赖关系进行了研究。重点讨论了0°入射时的吸收情况与结构参数之间的关系,并采用归一化的磁场强度分布对所得结果进行了解释。结果表明:该吸收器的吸收机制主要是表面等离子共振和光学谐振腔共振;在优化参数下,当入射角度为0°~70°时,该吸收器的吸收率均可达到80%以上。该吸收器在紫外传感、紫外光催化等领域具有潜在的应用价值。Objective An electromagnetic absorber is a device that converts incoming electromagnetic waves into other forms of energy.Since Landy et al.(2008)proposed a metal-insulator-metal-based narrow-band absorber,a wide range of absorbers have emerged.Because the broadband electromagnetic absorbers are widely used in photodetector,solar cells,cooling coolers,and photochemical devices,they have been a hot spot of research in recent years,and the broadband electromagnetic absorbers worked in visible light,infrared,terahertz,microwave,and other bands have been widely reported.UV absorbers have important applications in ultraviolet-related fields such as ultraviolet photocatalyst,but there are few reports on this type of absorber.Although most absorption bands of previously designed absorbers involve the ultraviolet band,they don’t completely cover the ultraviolet band,and the absorption effect of the ultraviolet band is not better than that of the other bands,with an average absorption rate of only about 60%.In terms of material and performance,most applications of the absorbers are focused on fields such as energy collection,but ultraviolet protection is less explored.It is critical to design a broadband efficient absorption device that fully covers the ultraviolet band in order to improve the absorption performance and give full play to the performance of the ultraviolet band,combined with its adopted material characteristics and design structure,and to understand the physical mechanism behind it.Methods A multigroove ultraviolet absorber was designed using Bi_(1.5)Sb_(0.5)Te_(1.8)Se_(1.2)(BSTS)material.First,modeling was done with COMSOL software.The incident and reflection ports were assigned to port 1,while the transmission port was assigned to port 2.To account for the diffraction effects of levels 0 and±1,two diffraction levels were set under each port.Periodic boundary conditions were set on the left and right sides to ensure the structure’s periodic setting.The grid was then finely divided to ensure the accur

关 键 词：光学器件 紫外线吸收器 光栅 Bi_(1.5)Sb_(0.5)Te_(1.8)Se_(1.2) 表面等离子共振 光学谐振腔共振 

分 类 号：O431[机械工程—光学工程]