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利用二氧化钒薄膜绝缘相—金属相的相变特性,提出了一种基于超材料的温控太赫兹调制器,研究了相变超材料在太赫兹波段的传输特性和温控可调谐特性.当入射太赫兹波为水平偏振或垂直偏振状态时,器件的透过率谱线在1THz附近呈现出两个独立的、中心频率分别为1.3THz和1.7THz、带宽分别为0.2THz和0.35THz的透射宽带.当温度从40C至80C变化时,两宽带的透过率发生明显的降低,在二氧化钒的相变温度(68C)时尤其灵敏,对入射光的二种偏振状态,调制深度均达到60%以上,实现了良好的调制效果.
Based on the phase transition characteristics of insulating phase - metal phase in vanadium dioxide thin film, a temperature-controlled terahertz modulator based on metamaterials is proposed. The transmission characteristics and temperature tunable characteristics of phase transition metamaterials in terahertz range are studied. When the incident terahertz wave is horizontally polarized or vertically polarized, the transmission line of the device exhibits two independent near-1 THz frequencies centered at 1.3 THz and 1.7 THz with bandwidths of 0.2 THz and 0.35 THz, respectively Transmission broadband.When the temperature changes from 40C to 80C, the transmission of the two widebands obviously decreases, especially at the transition temperature of vanadium dioxide (68C), the polarization state of the incident light, the modulation depth Reached more than 60%, to achieve a good modulation effect.