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

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-fie...

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Bibliographic Details
Published in:arXiv.org 2015-07
Main Authors: Naruse, Makoto, Tani, Takeharu, Inoue, Tetsuya, Yasuda, Hideki, Hori, Hirokazu, Naya, Masayuki
Format: Article
Language:English
Subjects:
Circular polarization
Electric components
Infrared reflection
Linear polarization
Nanoparticles
Nanostructure
Near fields
Optical properties
Wave reflection
Wavelengths
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1507.00263