长距离太赫兹无衍射波束的产生  

Generation of Terahertz Beams with Long Diffraction-Free Length

作　　者：吴巧 项飞荻 黄倩 杨振刚[2] 刘劲松 王可嘉 Wu Qiao;Xiang Feidi;Huang Qian;Yang Zhengang;Liu Jinsong;Wang Kejia(Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan,Hubei 430074,China;School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan,Hubei 430074,China)

机构地区：[1]华中科技大学武汉光电国家研究中心,湖北武汉430074 [2]华中科技大学光学与电子信息学院,湖北武汉430074

出　　处：《中国激光》2019年第6期237-243,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(11574105,61475054)

摘　　要：提出一种轴棱锥-透镜-轴棱锥的相位透镜组结构,对该结构进行理论分析和模拟仿真计算,并采用快速三维打印技术制备的轴棱锥进行实验验证,获得无衍射长度接近1000mm的太赫兹贝塞尔波束。该波束的无衍射区域不再紧贴轴棱锥,而是具有约100mm的投送距离。该研究结果可促进太赫兹贝塞尔波束在大景深成像方面的应用。This study aims to propose a structure of axicon-lens-axicon phase lens group.The structure is simulated and analyzed theoretically.The experimental verification is conducted using the rapid 3Dprinting technology to prepare an axonal pyramid,and a terahertz Bessel beam with 1000mm diffraction-free length is generated.The results indicate that the diffraction-free region of such a beam is no longer proximal to the axial pyramid,but has a 100mm distance from the final axicon.The findings in this study are helpful for the application of a terahertz Bessel beam in the field of large depth of field imaging.

关 键 词：太赫兹技术 贝塞尔波束 透镜组 多轴棱锥 时域有限差分法 

分 类 号：TN42[电子电信—微电子学与固体电子学]