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太赫兹波调制器是太赫兹波通信系统中关键的一环,同时,可调谐光子晶体作为一种新兴材料,被广泛地用于制作光通信系统中的调制器、光开关和滤波器等功能器件。光子晶体技术和太赫兹波技术相结合为设计太赫兹波调制器提供了新的思路。提出了一种基于二维硅光子晶体的新型太赫兹波调制器。该光子晶体采用点、线缺陷组合的结构,通过在点缺陷处填充5CB液晶,使其成为可调谐光子晶体。当在点缺陷处外加电场时,此太赫兹光子晶体的缺陷态频率发生动态迁移。基于这种机制,此器件可对太赫兹波的通、断状态进行调制。仿真结果表明,调制器的调制深度大于30dB,调制速率为10kHz,具有体积小巧、易于集成的优点。
Terahertz wave modulators are a key part of terahertz wave communication system. At the same time, tunable photonic crystals as a new material are widely used in the manufacture of optical communication systems such as modulators, optical switches and filters Device. The combination of photonic crystal technology and terahertz technology offers a new idea for designing terahertz wave modulators. A new type of terahertz wave modulator based on two-dimensional silicon photonic crystal is proposed. The photonic crystal adopts the combination of point and line defects, and becomes a tunable photonic crystal by filling 5CB liquid crystal at a point defect. When an electric field is applied to a point defect, the defect state frequency of the terahertz photonic crystal undergoes a dynamic migration. Based on this mechanism, the device can modulate the on and off states of terahertz waves. The simulation results show that the modulation depth of the modulator is more than 30dB and the modulation rate is 10kHz, which has the advantages of small size and easy integration.