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中文摘要：
设计并制备了两种工作在太赫兹波段的等离子体晶体波导,利用其带隙位置随波导间空气间隙变化而连续变化的特点,实现了光开关和机械可调谐滤波器的功能。利用太赫兹时域光谱系统研究了这两种等离子体晶体波导的传输和滤波性质,利用时域有限差分法计算了其透射率,用有限元法计算了其带隙性质和场分布。结果表明应用这两种结构实现的可调谐滤波器都具有良好的性能,其中一维等离子体晶体波导的调谐范围达到了130 GHz,消光比为30 d B;二维等离子体晶体波导的调谐范围达到了110 GHz,消光比可达40 d B。
英文摘要：
Two kinds of plasmonic crystal waveguides at terahertz band are designed and fabricated. Based on the property that the bandgaps of the waveguides can be manipulated actively by varying the air gap between the waveguide, the functions of optical switch and mechanically tunable filter have been realized. The transmission and filtering properties of the two plasmonic crystal waveguides are investigated by terahertz time-domain system. The transmittance is calculated by finite-difference time-domain method. The band gap properties and field distributions are simulated by finite element method. The results indicate that both of the two tunable filters achieve good performance. The extinction ratio of the one-dimensional plasmonic crystal waveguide is 30 d B, the tunable band gap range is 130 GHz, while the range of the two-dimensional plasmonic crystal waveguide is 110 GHz, and the extinction ratio is 40 d B.
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