Institut für Angewandte Physik and DFG-Center for Functional Nanostructures (CFN), Universität Karlsruhe (TH),D-76128 Karlsruhe, Germany.
Opt Lett. 2009 Aug 15;34(16):2501-3. doi: 10.1364/ol.34.002501.
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 microm 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.
最近的理论建议和微波实验之后，我们使用两次连续的电子束光刻步骤和通过旋涂介电质进行的中间平坦化，制造了由一对扭曲的金十字组成的光子超材料。耦合系统的两个有效共振位于 1-2 微米波长范围，并表现出明显的圆二色性，而圆偏振转换非常小。在两个共振之间，我们发现了一个相当宽的具有强旋光性的光谱区域，即具有入射线性偏振的纯旋转。测量的光透射谱与理论吻合得很好。
