ID | 118770 |
Author |
Watanabe, Tomoki
Tokushima University
Okamoto, Toshihiro
Tokushima University
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Keywords | Kretschmann configuration
plasmonics
optical geometry
semi-shell scattered property
scattered-light spectroscopy
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Content Type |
Journal Article
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Description | Dielectric nanoparticles coated with metals (half-shell or semi-shell structures) have attracted attention as potential composite plasmonic nanomaterials with large optical anisotropy and absorption cross-sections. Structures approximately 100 nm in size can excite plasmons in the visible and near-infrared ranges, highlighting their distinct optical properties. This study employed metal semi-shell structures (metal: gold, dielectric: silica) in the Kretschmann configuration to experimentally and numerically demonstrate the optical determination of single-structure orientations through a finite-difference time-domain method. Gold semi-shell structures were fabricated through deposition and etching. These structures were removed from their substrate in ultrapure water and randomly dropped onto a thin gold substrate. In the single structure, we experimentally observed changes in the scattering light spectrum based on the optical geometry of the gold semi-shell at wavelengths ranging from 530 to 700 nm. The obtained results closely resembled those of a simulation and confirmed the presence of eigenmodes in the orientation through electric field analysis. These observations allow for the cost-effective and rapid determination of the orientations of numerous structures that are approximately 100 nm in size, solely through optical methods. This technique is a valuable development for measurement applications in nanostructure orientation control and functionality enhancement.
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Journal Title |
Photonics
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ISSN | 23046732
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Publisher | MDPI
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Volume | 10
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Issue | 11
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Start Page | 1228
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Published Date | 2023-11-02
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Rights | This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
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DOI (Published Version) | |
URL ( Publisher's Version ) | |
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language |
eng
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TextVersion |
Publisher
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departments |
Science and Technology
Institute of Post-LED Photonics
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