Strong optical activity from twisted-cross photonic metamaterials
Strong optical activity from twisted-cross photonic metamaterials
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DOI：
10.1364/ol.34.002501
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发表时间：
2009-08-15
期刊：
影响因子：
3.6
通讯作者：
Wegener, M.
中科院分区：
文献类型：
--
作者：
Decker, M.;Ruther, M.;Wegener, M.
根据最近的理论建议和微波实验，我们制造光子超材料组成的扭曲的金十字对使用两个连续的电子束光刻步骤和中间平面化通过旋涂电介质。耦合系统的两个有效共振位于1-2 μ m的波长范围内，并表现出明显的圆二色性，而圆偏振转换是非常小的。在两个共振之间，我们发现了具有强光学活性的相当宽的光谱区域，即，具有入射线性偏振的纯旋转。实验测得的透射光谱与理论计算结果吻合较好。(C)2009年美国光学学会
Following a recent theoretical suggestion and microwave experiments, we fabricate photonic metamaterials composed of pairs of twisted gold crosses using two successive electron-beam-lithography steps and intermediate planarization via a spin-on dielectric. The resulting two effective resonances of the coupled system lie in the 1-2 mu m wavelength regime and exhibit pronounced circular dichroism, while the circular polarization conversion is very small. In between the two resonances, we find a fairly broad spectral regime with strong optical activity, i.e., with a pure rotation of incident linear polarization. The measured optical transmittance spectra agree well with theory. (C) 2009 Optical Society of America