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Circular Dichroism in Higher‐Order Diffraction Beams from Chiral Quasiplanar Nanostructures
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-03-27 , DOI: 10.1002/adom.201800098 Christian Kuppe 1 , Calum Williams 2 , Jie You 3 , Joel T. Collins 1 , Sergey N. Gordeev 1 , Timothy D. Wilkinson 2 , Nicolae-Coriolan Panoiu 3 , Ventsislav K. Valev 1
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-03-27 , DOI: 10.1002/adom.201800098 Christian Kuppe 1 , Calum Williams 2 , Jie You 3 , Joel T. Collins 1 , Sergey N. Gordeev 1 , Timothy D. Wilkinson 2 , Nicolae-Coriolan Panoiu 3 , Ventsislav K. Valev 1
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Miniaturization down to the nanoscale has enabled a new paradigm of ultrathin optical devices, capable of manipulating the direction, polarization, and frequency of light. Great interest is drawn by the promising prospects of deep‐subwavelength material dimensions. However, interesting properties and opportunities offered by structures with sizes comparable to the wavelength of light appear to have been overlooked. Here, quasiplanar chiral arrays made of gold are considered and show that higher‐order diffracted beams can yield extremely large chiroptical responses for optical frequencies. The chosen sample geometry demonstrates spectrally tunable polarization conversion and extremely large circular dichroism. Experimental and numerical data are in good agreement, for both sample chiral forms, and for the complementary geometries under Babinet's principle. Specifically, the experimental results show that the fractional circular dichroism (CD) can be as high as 20%, in the third‐order diffraction beam. Based on the numerical results, a great potential for improvement is anticipated, which makes higher‐order diffraction CD a very promising candidate for ultrathin optical applications.
中文翻译：
来自手性拟平面纳米结构的高阶衍射光束的圆二色性
最小化到纳米级已经实现了超薄光学器件的新范例，该超薄光学器件能够操纵光的方向，偏振和频率。深亚波长材料尺寸的广阔前景引起了人们极大的兴趣。然而，尺寸可与光的波长相媲美的结构所提供的有趣特性和机会似乎已被忽略。在这里，考虑了由金制成的准平面手性阵列，它们表明高阶衍射光束可以对光频率产生非常大的手性响应。所选的样品几何形状展示了光谱可调的偏振转换和极大的圆二色性。无论是样品手性形式还是Babinet's下的互补几何，实验数据和数值数据都非常吻合 的原则。具体来说，实验结果表明，在三阶衍射光束中，分数圆二色性（CD）可以高达20％。根据数值结果，可以预见有很大的改进潜力，这使得高阶衍射CD成为超薄光学应用的非常有希望的候选者。
更新日期：2018-03-27
中文翻译：
来自手性拟平面纳米结构的高阶衍射光束的圆二色性
最小化到纳米级已经实现了超薄光学器件的新范例，该超薄光学器件能够操纵光的方向，偏振和频率。深亚波长材料尺寸的广阔前景引起了人们极大的兴趣。然而，尺寸可与光的波长相媲美的结构所提供的有趣特性和机会似乎已被忽略。在这里，考虑了由金制成的准平面手性阵列，它们表明高阶衍射光束可以对光频率产生非常大的手性响应。所选的样品几何形状展示了光谱可调的偏振转换和极大的圆二色性。无论是样品手性形式还是Babinet's下的互补几何，实验数据和数值数据都非常吻合 的原则。具体来说，实验结果表明，在三阶衍射光束中，分数圆二色性（CD）可以高达20％。根据数值结果，可以预见有很大的改进潜力，这使得高阶衍射CD成为超薄光学应用的非常有希望的候选者。
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