Interaction of Structured Light with a Chiral Plasmonic Metasurface: Giant Enhancement of Chiro-Optic Response,ACS Photonics

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Interaction of Structured Light with a Chiral Plasmonic Metasurface: Giant Enhancement of Chiro-Optic Response
ACS Photonics ( IF 6.5 ) Pub Date : 2018-01-08 00:00:00 , DOI: 10.1021/acsphotonics.7b01321
Innem V.A.K. Reddy , Alexander Baev , Edward P. Furlani , Paras N. Prasad , Joseph W. Haus ₁

Affiliation

We propose an approach to achieve giant enhancement and broad spectral tunability of the chiro-optic response of plasmonic metasurfaces by exploiting interaction with complex light, endowed with both spin and orbital angular momentum. As a proof of principle, we employ full-wave computational analysis to investigate the response of a structured, circularly polarized transverse Laguerre-Gaussian beam incident on a chiral metasurface composed of a two-dimensional array of gold nanohelix meta-atoms. Our analysis reveals for the first time unprecedented amplification of circular dichroism that is a manifestation of the total angular momentum of the incident light being enantioselectively transferred to the medium. We also demonstrate that the spectral response of the meta-atoms can be designed to produce a rich manifold of narrow spectral lines with steep gradients. The approach proposed here opens up opportunities for new spectroscopic modalities to probe fundamental molecular structure and behavior, as well as unique, multiplexed biochemical sensing technologies, and a new class of engineered chiral metamaterials in the form of versatile ultrathin media with unmatched optical performance for a gamut of applications, including a new direction for spin photonics, exploiting high reflection contrast between opposite spins.

中文翻译：

结构性光与手性等离子体后表面的相互作用：手性光学反应的巨大增强。

我们提出了一种方法，该方法通过利用与自旋和轨道角动量共同作用的复杂光的相互作用来实现等离子体超颖表面的手性光响应的巨大增强和宽光谱可调谐性。作为原理上的证明，我们采用全波计算分析来研究结构化，圆偏振的横向拉盖尔-高斯光束入射在由金纳米螺旋亚原子的二维阵列组成的手性超表面上的响应。我们的分析首次揭示了圆二色性的空前放大，这是对映选择性地转移到介质中的入射光的总角动量的体现。我们还证明了可以将亚原子的光谱响应设计为产生具有陡峭梯度的窄光谱线的丰富流形。本文提出的方法为探索基本分子结构和行为的新光谱方法以及独特的多元生化传感技术以及新型工程手性超材料（以通用超薄介质形式提供，具有无与伦比的光学性能）提供了机会。应用范围广，包括自旋光子学的新方向，它利用了相反自旋之间的高反射对比度。

更新日期：2018-01-08

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