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Giant Optical Activity in Quasi-Two-Dimensional Planar Nanostructures

机译:准二维平面纳米结构中的巨光学活性

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We examine the spectral dependence in the visible frequency range of the polarization rotation of two-dimensional gratings consisting of chiral gold nanostructures with subwavelength features. The gratings, which do not diffract, are shown to exhibit giant specific rotation (~10~4°/mm) of polarization in direct transmission at normal incidence. The rotation is the same for light incident on the front and back sides of the sample. Such reciprocity indicates three dimensionality of the structure arising from the asymmetry of light-plasmon coupling at the air-metal and substrate-metal interfaces. The structures thus enable polarization control with quasi-two-dimensional planar objects. However, in contradiction with recently suggested interpretation of experiments on larger scale but otherwise similar structures, the observed polarization phenomena violate neither reciprocity nor time-reversal symmetry.
机译:我们研究了由具有亚波长特征的手性金纳米结构组成的二维光栅的偏振旋转在可见光频率范围内的光谱依赖性。不衍射的光栅显示出在法向入射时直接透射时显示出巨大的偏振比旋光(〜10〜4°/ mm)。对于入射在样品正面和背面的光,旋转是相同的。这种互易性表明结构的三维度是由于在空气-金属和基底-金属界面处的光-等离子体耦合不对称引起的。因此,该结构使得能够利用准二维平面物体进行偏振控制。但是,与最近建议的对大规模实验的解释相反,否则与其他类似结构相反,观察到的极化现象既不违反互易性也不违反时间反转对称性。

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