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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。提出并设计了一种基于自准直效应和法布里珀罗(F-P)腔的太赫兹波调制器,该调制器通过在特殊结构设计的硅基空气孔型光子晶体中填充5CB液晶制成。应用时域有限差分法(FDTD),研究了太赫兹波在该调制器中的传输特性,包括时域响应、频域响应和稳态能量场分布等。该调制器调制速率约为10kHz,插入损耗约为0.308dB,调谐范围为0.308～34.32dB,体积小易于集成,可根据工作波长需要设计调制器的尺寸。该调制器最大优点在于其工作波长范围宽,是很理想的太赫兹波调制器件。
The combination of photonic crystal technology and terahertz technology offers a new idea for designing terahertz wave modulators. A terahertz-wave modulator based on self-collimation and Fabry-Perot (FP) cavity is proposed and designed. The modulator is fabricated by filling 5CB liquid crystal into a Si-based air-hole photonic crystal with special structure design . The transmission characteristics of terahertz wave in the modulator are studied by FDTD method, including the time-domain response, the frequency domain response and the steady-state energy field distribution. The modulator modulation rate of about 10kHz, insertion loss of about 0.308dB, tuning range of 0.308 ~ 34.32dB, small size and easy integration, according to the design of the working wavelength needs of the modulator size. The biggest advantage of the modulator is its wide operating wavelength range, making it an ideal terahertz modulation device.