Optimization of linear passive terahertz isolator
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摘要: 为了获得结构简单、无需外加低温和强磁场的太赫兹隔离器,采用3维时域有限差分法对1种硅基光子晶体异质结结构的太赫兹隔离器进行了理论优化分析。该隔离器结构简单,可常温工作,并且无需外加磁场。结果表明,其隔离特性与两种光子晶体的孔径有关,在孔径比例合适(在0.52THz的最优化孔径比R1/R2=0.49)的情况下可以实现25dB的最大隔离度。Abstract: In order to obtain terahertz isolators with simple structure and without the need of additional low temperatures and strong magnetic fields, a silicon-based photonic crystal heterostructure THz isolator was ananlyzed and optimized by using three-dimensional finite-difference time-domain method (3-D-FDTD). The isolator can work at room temperature, with simple structure and without external magnetic field. The results show that the isolation characteristics depends on the ratio of the pore size of both the photonic crystals. In the right ratio of the aperture (optimized aperture ratio R1/R2=0.49 at 0.52THz),maximum isolation of 25dB can be achieved.
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Keywords:
- nonlinear optics /
- terahertz isolator /
- photonic crystal /
- hetero junction /
- negative refraction
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