Optimally Chiral Light: Upper Bound of Helicity Density of Structured Light for Chirality Detection of Matter at Nanoscale,ACS Photonics

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Optimally Chiral Light: Upper Bound of Helicity Density of Structured Light for Chirality Detection of Matter at Nanoscale
ACS Photonics ( IF 6.5 ) Pub Date : 2020-09-10 , DOI: 10.1021/acsphotonics.0c00304
Mina Hanifeh ₁ , Mohammad Albooyeh ₁ , Filippo Capolino ₁

Affiliation

We introduce the universal upper bound of helicity density, which is the maximum helicity light can have at a given light energy density. Helicity maximization as discussed here is applicable to any structured light, and it defines optimally chiral fields. We further demonstrate that using structured light with maximized helicity density for determining the chirality of a nanoparticle using the dissymmetry factor g eliminates the need for specific knowledge of the values of field energies and helicity densities. We also show that nearfields that satisfy the universal bound discussed in this paper can be generated by high-density dielectric nanoantennas illuminated by structured light that satisfies such a bound, leading also to helicity enhancement. The helicity maximization concept generalizes the use of the dissymmetry factor g for nanoparticle chirality detection to any chiral structured light illumination.

中文翻译：

最佳手性光：用于纳米级手性检测的结构化光的螺旋密度的上限

我们介绍了螺旋密度的通用上限，即在给定的光能密度下，光可以具有的最大螺旋度。此处讨论的最大螺旋度适用于任何结构光，并且它定义了最佳手性场。我们进一步证明，使用不对称因子g使用最大螺旋密度的结构光来确定纳米粒子的手性消除了对场能和螺旋密度值的特定知识的需求。我们还表明，满足结构约束的高密度介电纳米天线可以通过满足这种约束的结构化光照射来生成满足本文讨论的通用边界的近场，从而也可以提高螺旋度。螺旋度最大化的概念概括了将不对称因子g用于纳米粒子手性检测的用途，适用于任何手性结构化光照。

更新日期：2020-10-21

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