Analytic Optimization of Near-Field Optical Chirality Enhancement.
Analytic Optimization of Near-Field Optical Chirality Enhancement.
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DOI：
10.1021/acsphotonics.6b00887
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发表时间：
2017-02-15
期刊：
影响因子：
7
通讯作者：
Brixner T
中科院分区：
文献类型：
--
作者：
Kramer C;Schäferling M;Weiss T;Giessen H;Brixner T
我们提出了一个解析推导的等离子体纳米结构的近场局部光学手征的增强，通过调整外光的远场偏振。我们说明的结果，通过模拟与非手性和手性纳米结构组件，并表明，局部光学手性显着增强相对于圆偏振在自由空间中。最佳的外部远场极化是不同的圆形和线性。可以利用纳米结构的对称性来确定最佳远场偏振是否为圆形。此外，最佳远场偏振依赖于频率，这导致用于宽带优化的复杂形状的激光脉冲。
We present an analytic derivation for the enhancement of local optical chirality in the near field of plasmonic nanostructures by tuning the far-field polarization of external light. We illustrate the results by means of simulations with an achiral and a chiral nanostructure assembly and demonstrate that local optical chirality is significantly enhanced with respect to circular polarization in free space. The optimal external far-field polarizations are different from both circular and linear. Symmetry properties of the nanostructure can be exploited to determine whether the optimal far-field polarization is circular. Furthermore, the optimal far-field polarization depends on the frequency, which results in complex-shaped laser pulses for broadband optimization.