近红外与太赫兹双波段局域场增强结构设计  

Structure Design of Near-Infrared and Terahertz Dual-Band Local Field Enhancement

作　　者：冀宝庆 李香宇 王艳红[1] 武京治[1] Ji Baoqing;Li Xiangyu;Wang Yanhong;Wu Jingzhi(School of Information and Communication Engineering,North University of China,Taiyuan 030051,Shanxi,China;School of Instrument and Electronics,North University of China,Taiyuan 030051,Shanxi,China)

机构地区：[1]中北大学信息与通信工程学院,山西太原030051 [2]中北大学仪器与电子学院,山西太原030051

出　　处：《激光与光电子学进展》2023年第5期386-390,共5页Laser & Optoelectronics Progress

基　　金：国防科技创新特区(02-ZT-008)。

摘　　要：设计了一种近红外与太赫兹双波段局域场增强结构,由微米级矩形槽结构与纳米级双圆盘结构构成。利用微米级矩形槽结构实现太赫兹共振增强,同时将纳米级双圆盘结构与其相结合实现在近红外波段的光学捕获,并采用时域有限差分法对结构进行仿真分析。研究结果表明:双波段局域场增强结构在0.63 THz处有谐振峰同时具有强的局域场增强,最大电场增强1800;在近红外波段入射光强为1 mW/μm^(2)时,势阱深度达到30kBT,可以实现粒子的稳定捕获。该研究结果对生物大分子太赫兹振动谱探测具有一定的参考意义。A local field enhancement structure with dualband of near infrared and terahertz is designed,which consists of a micronscale rectangular groove structure and a nanoscale double disk structure.The terahertz resonance enhancement is realized by using the micronscale rectangular groove structure,and the nanoscale double disk structure is combined with it to achieve optical capture in the near infrared band.The structure is simulated and analyzed by the finite difference time domain method.Research results show that the dualband local field enhancement structure has a resonance peak at 0.63 THz and strong local field enhancement,and the maximum electric field enhancement is 1800.When the incident light intensity in the near infrared band is 1 mW/μm^(2),the depth of the potential well reaches 30 kBT,which can achieve stable trapping of particles.The results have a certain reference significance for the detection of THz vibration spectrum of biological macromolecules.

关 键 词：光谱学 双波段局域场增强结构 光学捕获 时域有限差分法 

分 类 号：O441.4[理学—电磁学]