标题： 纳米结构中由线性偏振通过光学近场引起的局部圆偏振 显示英文标题

标题： Local circular polarizations in nanostructures induced by linear polarization via optical near-fields

摘要： 我们之前报道过[Naruse等人，Sci. Rep. 4, 6077, 2014]，盘状银纳米颗粒在近红外波长下表现出高反射率，其几何随机性是纳米结构附近粒子依赖的光学近场局域化和分层分布的起源。在本研究中，我们表明感应极化是圆偏振的，尤其是在共振波长下。我们制定了纳米结构之间的光学近场过程，考虑了它们的极化和几何形状，并将圆偏振归因于与纵向和横向电分量相关的电极化率之间的布局依赖相位差。本研究阐明了随机纳米结构物质的基本光学特性，并为实现光学近场的纳米尺度极化提供了通用的理论概念。 显示英文摘要

摘要： We previously reported [Naruse, et al. Sci. Rep. 4, 6077, 2014] that the geometrical randomness of disk-shaped silver nanoparticles, which exhibit high reflection at near-infrared wavelengths, serves as the origin of a particle-dependent localization and hierarchical distribution of optical near-fields in the vicinity of the nanostructure. In this study, we show that the induced polarizations are circular, particularly at resonant wavelengths. We formulate optical near-field processes between nanostructures, accounting for their polarizations and geometries, and attribute circular polarization to the layout-dependent phase difference between the electrical susceptibilities associated with longitudinal and transverse-electric components. This study clarifies the fundamental optical properties of random nanostructured matter and offers generic theoretical concepts for implementing nanoscale polarizations of optical near-fields.