太赫兹大孔径折射透镜的焦移特性研究  

Focal shift effect of terahertz wide-aperture refractive lens

作　　者：李惟帆 祁峰 汪业龙[1,2,3] 刘鹏翔 刘朝阳[1,2,3] LI Wei-Fan;QI Feng;WANG Ye-Long;LIU Peng-Xiang;LIU Zhao-Yang(Key Laboratory of Opto-Electronic Information Processing,Chinese Academy of Sciences,Shenyang 110169,China;Key Laboratory in Terahertz Imaging and Sensing,Liaoning Province,Shenyang 110169,China;Shenyang Institute of Automation,Chinese Academy of Sciences,Shenyang 110169,China)

机构地区：[1]中国科学院光电信息处理重点实验室,辽宁沈阳110169 [2]辽宁省太赫兹成像感知重点实验室,辽宁沈阳110169 [3]中国科学院沈阳自动化研究所,辽宁沈阳110169

出　　处：《红外与毫米波学报》2023年第3期345-349,共5页Journal of Infrared and Millimeter Waves

基　　金：Supported by Science,Technology&Innovation Project of Xiongan New Area (2022XAGG0181);Shenyang Young and Middle-aged Science and Technology Innovation Talent Support Program (RC220523)。

摘　　要：研究了利用大孔径折射透镜对太赫兹波进行聚焦时产生的焦移效应。焦移效应所引起的焦点位置偏差会对太赫兹系统的成像或测量质量产生不利影响。通过理论计算和有限元分析仿真,研究并讨论了与透镜孔径、焦距和工作频率有关的焦移参考值。当使用商用透镜时,实际焦点位置需要通过焦移效应来确定,以保证太赫兹系统的工作效率。对于定制透镜的设计,焦移需要根据工作频率,在焦距的设计中进行补偿。这两个途径可以保障太赫兹系统的良好性能。The focal shift effect of terahertz(THz) beam focusing when using a wide-aperture refractive lens has been investigated.The deviation of focus position caused by the focal shift effect can adversely affect the imaging or measurement quality of a THz system.In this study,reference values of relative focal shifts and combinations of different lens apertures,focal lengths,and working frequencies were analyzed and discussed through theoretical calculation and finite element analysis simulation.When using the commercial lens,the actual focus was determined based on the focal shift effect to ensure the working efficiency of a terahertz system.Concerning the customized lens design,the focal shift distance was compensated in the focal length optimization according to the working frequency.These two approaches guaranteed the good performance of a THz system.

关 键 词：太赫兹透镜 焦移 有限元分析 非球面镜 

分 类 号：O43[机械工程—光学工程]