Time-resolved imaging of mode-conversion process of terahertz transients in subwavelength waveguides  

作　　者：Yao Lu Qiang Wu Qi Zhang Ri-De Wang Bin Zhang Wen-Juan Zhao Deng Zhang Hao Xiong Cheng-Liang Yang Ji-Wei Qi Chong-Pei Pan Jing-Jun Xu 

机构地区：[1]The Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, TEDA Institute of Applied Physics and School of Physics, Nankai University, Tianjin 300457,China [2]College of Science, Civil Aviation University of China, Tianjin 300300, China [3]State Key Laboratory of Applied Optics, Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130039,China

出　　处：《Frontiers of physics》2019年第4期125-129,共5页物理学前沿（英文版）

基　　金：supported by the National Natural Science Foundation of China (NSFC)(Grant Nos. 61705013 and 61378018);the 111 Project (No. B07013);the Program for Changjiang Scholars and Innovative Research Team in University (No.IRT_13R29).

摘　　要：We studied the mode-conversion process of terahertz pulses from a planar subwavelength waveguide to a tilted rectangular subwavelength waveguide. An unusual wavefront rotation, which led to an extra conversion t ime, was observed using a time-resolved imaging t echnique. We Simula ted the mode conversion process by a finite-difference time-domain method, and the results agreed well with the experiments. According to the simulations, the conversion time was demonstrated to become longer as the tilt angle or width of the rectangular waveguide increased. This work provides the possibility to optimize the future high-speed communications and t erahertz integrated plat forms.

关 键 词：ULTRAFAST phenomenon mode conversion SUBWAVELENGTH WAVEGUIDES TERAHERTZ waves 

分 类 号：O4[理学—物理]