Effect of surface plasmon resonance on the optical activity of chiral metal nanogratings.
Effect of surface plasmon resonance on the optical activity of chiral metal nanogratings.
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DOI：
10.1364/oe.15.009575
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发表时间：
2007-07
期刊：
影响因子：
3.8
通讯作者：
Kuniaki Konishi;T. Sugimoto;Benfeng Bai;Yu. P. Svirko;M. Kuwata-Gonokami
中科院分区：
文献类型：
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作者：
Kuniaki Konishi;T. Sugimoto;Benfeng Bai;Yu. P. Svirko;M. Kuwata-Gonokami
我们研究了在介质衬底上没有镜像对称性的二维金纳米结构阵列的光学活性的机制。不同入射角、极化和样品取向的测量结果表明，表面等离子体共振增强了观察到的极化效应。通过严格的衍射理论进行数值模拟，我们还发现，可以用光栅层正面(空气-金属)和背面(衬底-金属)的电场矢量的非共面性来描述光栅的手性。
We examine the mechanism responsible for the optical activity of a two-dimensional array of gold nanostructures with no mirror symmetry on a dielectric substrate. Measurements with different incident angles, polarizations and sample orientations allow us to reveal that observed polarization effect is enhanced by surface plasmon resonance. By performing numerical simulation with rigorous diffraction theory we also show that the grating chirality can be described in terms of the non-coplanarity of the electric field vectors at the front (air-metal) and back (substrate-metal) sides of the grating layer.