Analytic Optimization of Near-Field Optical Chirality Enhancement

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• 作者：Christian Kramer ; Martin Schäferling ; Thomas Weiss ; Harald Giessen ; Tobias Brixner
• 刊名：ACS Photonics
• 出版年：2017
• 出版时间：February 15, 2017
• 年：2017
• 卷：4
• 期：2
• 页码：396-406
• 全文大小：710K
• ISSN：2330-4022

文摘

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.