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Giant optical activity in quasi-2D planar nanostructures

机译:Quasi-2D平面纳米结构中的巨光学活性

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Planar chirality can lead to interesting polarization effects whose interpretation has invoked possible violation of reciprocity and time reversality. We show that a quasi-two-dimensional array consisting of gold nanoparticles with no symmetry plane and having sub-wavelength periodicity and thickness exhibits giant specific rotation (~104 ?mm) at normal incidence. The rotation is the same for light incident on the front and back sides of the sample. Such reciprocity manifests three-dimensionality of the structure arising from the asymmetry of light-plasmon coupling at the air-metal and substrate-metal interfaces of the structure. The structures thus enable nanoscale polarization control but violate no symmetry principle.
机译:平面手平性可能导致有趣的极化效应,其解释已经调用了可能违反互惠和时间逆转。我们表明,由没有对称平面的金纳米颗粒和具有亚波长周期度和厚度的金纳米颗粒组成的准二维阵列在正常入射时表现出巨大的特异性旋转(〜104Ωmm)。对于入射在样品的前侧和背面的光相同,旋转是相同的。这种互替代表现出由结构的空气和衬底 - 金属界面处的光等载耦合的不对称产生的结构三维。因此,结构使纳米级极化控制能够违反对称原理。

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