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Terahertz wave modulator based on optically controllable metamaterial
Authors:Jiu-Sheng Li
Institution:1. School of Microelectronics and Communication Engineering, Chongqing University, Chongqing 400044, China;2. Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan 250358, China;3. State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University, Chongqing 400044, China;1. School of Electrical and Electronic Engineering, Tianjin University of Technology, Tianjin 300384, PR China;2. Tianjin Key Lab of Film Electronic & Communication Devices, Tianjin University of Technology, Tianjin 300384, PR China;3. College of Precision Instrument and Opto-electronics Engineering, Institute of Laser and Opto-electronics, Tianjin University, Tianjin 300072, PR China;4. Key Laboratory of Optoelectric Information Science and Technology, Ministry of Education, Tianjin University, Tianjin 300072, PR China;1. Department of Physics, Nanchang University, Nanchang 330031, China;2. Institute of Space Science and Technology, Nanchang University, Nanchang 330031, China;3. Shanghai Institute of Microsystem and Information, Chinese Academy of Sciences, Shanghai 200050, China
Abstract:We demonstrated experimentally a terahertz wave modulator based on optically controlled metamaterial. The signal modulation mechanism of the presented terahertz wave modulator was based on the resonance characteristic of metamaterial controlled without or with light excitation. A modulated semiconductor laser with 808 nm wavelength was employed to light the substrate. The interaction between the metamaterial and terahertz wave was strengthened and yielded an appreciable modulation of the terahertz output beam. The modulation speed is 0.1 Kb/s and the modulation depth of the proposed terahertz modulator is about 57% at a frequency of 0.32 THz.
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