Chiral nanosurfaces for enhancement of local electromagnetic field
Chiral nanosurfaces for enhancement of local electromagnetic field
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DOI：
10.1117/12.2589695
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发表时间：
2021-04
期刊：
影响因子：
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通讯作者：
L. Ohnoutek;V. Valev
中科院分区：
文献类型：
--
作者：
L. Ohnoutek;V. Valev
等离子体纳米表面在光照时在其附近产生强烈电磁场的能力可以用来增强效应，例如那些源于分子手性(缺乏镜面对称性)的效应。我们数值研究了由不同堆积密度的等离子体纳米棒组成的手性纳米表面。我们确定了最大场强的最佳光照条件。在这种照明条件下，近表面的光学手征性在接近表面的大范围(200 nm×200 nm)内超过入射光的光学手性近一个数量级。我们的模拟证明了纳米表面是增强手性光学效应的有前途的候选者。
The ability of plasmonic nanosurfaces to produce strong electromagnetic fields in their vicinity upon illumination can be used to enhance effects, such as those originating from chirality (lack of mirror symmetry) of molecules. We numerically investigate chiral nanosurfaces composed of plasmonic nanobars with varying packing densities. We identify the optimum illumination conditions for maximal field enhancement. Under these illumination conditions, the optical chirality near the surface exceeds the optical chirality of the incident light by almost an order of magnitude in a large area (200 nm × 200 nm) near the surface. Our simulations prove the nanosurfaces to be promising candidates for enhancement of chiral-optical effects.