A one-dimensional photonic crystal working in the terahertz (THz) range was designed and implemented. To facilitate the design, the transmission properties of strontium titanate crystals were characterized by THz-time-domain spectroscopy. Relatively high refractive index (∼18.5) and transmission ratio (0.08) were observed between 0.2 to 1 THz. A stacked structure of (Si d Si/STO d STO) N /Si d Si was then designed, with transmission spectra calculated by the transfer matrix method. The effects of the filling ratio (d STO/(d Si+d STO)), periodicity (d Si+d STO) and the number of repeats N on the transmission of PC were investigated. The effect of introducing a defect layer was also studied. Based on these, Si/STO multilayers with STO defect thickness of 125 μm and 200 μm were measured. The shift of the defect mode was observed and compared with the calculations.
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机译：设计并实现了在太赫兹（THz）范围内工作的一维光子晶体。为了便于设计，通过太赫兹时域光谱法表征了钛酸锶晶体的透射性质。在0.2至1 THz之间观察到相对较高的折射率（〜18.5）和透射比（0.08）。然后设计（Si d Si / STO d STO）N / Si d Si的堆叠结构，并通过传输矩阵法计算出透射光谱。研究了填充率（d STO /（d Si + d STO）），周期性（d Si + d STO）和重复次数N对PC传输的影响。还研究了引入缺陷层的效果。基于这些，测量了STO缺陷厚度为125μm和200μm的Si / STO多层。观察到缺陷模式的偏移并将其与计算结果进行比较。
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