Paudel Hari P, Bayat Khadijeh, Baroughi Mahdi Farrokh, May Stanley, Galipeau David W
Department of Electrical Engineering and Computer Science, South Dakota State University, Brookings, SD 57007, USA.
Opt Express. 2009 Nov 23;17(24):22179-89. doi: 10.1364/OE.17.022179.
Geometry dependence of surface plasmon resonance of 2D metallic photonic crystals (PCs) was assessed using rigorous 3D finite difference time domain analysis. PCs of noble metallic rectangular and cylindrical nanopillars in square and triangular lattices on thick noble metal film were simulated for maximum field enhancement. It was found that the period, size and thickness of the nanopillars can be tuned to excite of surface plasmons at desired wavelengths in visible and near-infrared ranges. Maximum electric field enhancement near the nanopillars was found to be greater than 10X. The detail analysis of PCs tuned for 750 nm wavelength showed that thickness of nanopillars was the most sensitive parameter for field enhancement, and triangular lattice PCs had the wider enhancement bandwidth than square lattice PCs. Results showed that these PCs are sensitive with incident angle (theta) but not with polarization angle (phi).
使用严格的三维时域有限差分分析评估了二维金属光子晶体（PCs）表面等离子体共振的几何依赖性。对厚贵金属膜上正方形和三角形晶格中的贵金属矩形和圆柱形纳米柱的光子晶体进行了模拟，以实现最大场增强。研究发现，可以调整纳米柱的周期、尺寸和厚度，以在可见光和近红外范围内的所需波长处激发表面等离子体。发现纳米柱附近的最大电场增强大于10倍。对调谐到750nm波长的光子晶体的详细分析表明，纳米柱的厚度是场增强最敏感的参数，并且三角形晶格光子晶体比正方形晶格光子晶体具有更宽的增强带宽。结果表明，这些光子晶体对入射角（θ）敏感，但对偏振角（φ）不敏感。
