Time-resolved imaging of mode-conversion process of terahertz transients in subwavelength waveguides |
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| Authors: | 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 |
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| Institution: | 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, China2. College of Science, Civil Aviation University of China, Tianjin 300300, China3. State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130039, China |
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| Abstract: | 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 time, was observed using a time-resolved imaging technique. We simulated 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 terahertz integrated platforms. |
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| Keywords: | ultrafast phenomenon mode conversion subwavelength waveguides terahertz waves |
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