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Surface states in the optical spectra of two-dimensional photonic crystals with various surface terminations

机译:具有各种表面终止的二维光子晶体光谱中的表面态

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Reflection and transmission spectra of two-dimensional photonic crystal slabs, fabricated by photoelectro-chemical etching of deep macropores and trenches in Si, are investigated theoretically and experimentally. It is shown that the presence of an unstructured silicon interfacial layer between the air and the photonic crystal structure can give rise to surface (Tamm) states within the TE and TM photonic stop bands. In the presence of roughness of inner surfaces of air pores, the surface states show up as dips within the stop bands in the reflection spectrum. The calculated electromagnetic near-field distribution demonstrates the vortices between the upper pores at the frequency of the surface mode. The experimental reflection and transmission spectra are in a good agreement with theoretical calculations performed by the Fourier modal method in the scattering matrix form.
机译:从理论上和实验上研究了通过光化学刻蚀硅深大孔和沟槽制备的二维光子晶体平板的反射和透射光谱。结果表明,在空气和光子晶体结构之间存在非结构化的硅界面层会导致TE和TM光子阻带内的表面(Tamm)状态。在气孔内表面粗糙的情况下,表面状态在反射光谱的阻带内表现为凹陷。计算出的电磁近场分布表明了在表面模式频率下上孔之间的涡旋。实验的反射光谱和透射光谱与以傅里叶模态法以散射矩阵形式进行的理论计算非常吻合。

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