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arXiv 1507.00263physics.optics
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线偏振近场诱导纳米结构中的局域圆偏振

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

Makoto Naruse, Takeharu Tani, Tetsuya Inoue, Hideki Yasuda, Hirokazu Hori, Masayuki Naya

摘要:

我们以前报道过[Naruse,et al. Sci. Rep. 4,6077,2014],在近红外波长处表现出高反射的盘形银纳米颗粒的几何随机性充当纳米结构附近的光学近场的颗粒依赖性定位和分级分布的起源。在这项研究中,我们表明,诱导极化是圆形的,特别是在共振波长。我们制定纳米结构之间的光学近场过程,占他们的偏振和几何形状,并归因于圆偏振的布局依赖的相位差与纵向和横向的电子元件相关的电致伸缩性之间。这项研究阐明了随机纳米结构物质的基本光学性质,并为实现光学近场的纳米级偏振提供了一般的理论概念。

英文摘要:

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.

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