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ID 55637
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Author
Ishikawa, Atsushi Department of Electrical and Electronic Engineering, Okayama University
Hara, Shuhei Department of Electrical and Electronic Engineering, Okayama University
Tanaka, Takuo Metamaterials Laboratory, RIKEN
Zhan, Xiang NSF Nanoscale Science and Engineering Center, University of California
Tsuruta, Kenji Department of Electrical and Electronic Engineering, Okayama University
Abstract
High-density and long-lived plasmonic hot-spots are an ideal system for high-sensitive surface-enhanced infrared absorption (SEIRA), but these conditions arc usually incompatible due to unwanted near-field coupling between the adjacent unit structures. Here, by fully controlling plasmonic interference in a metamaterial lattice, we experimentally demonstrate densely packed long-lived quadrupole plasmons for high-sensitive SEIRA. The metamaterial consists of a strongly coupled array of super-and sub-radiant plasmonic elements to exhibit an electromagnetic transparency mode at 1730 cm(-1), which spectrally overlaps with the C=O vibrational mode. In the SEIRA measurement, the C=O mode of poly(methyl methacrylate) molecules is clearly observed as a distinct dip within a transmission peak of the metamaterial. The corresponding numerical simulations reveal that constructive interference uniformly forms coherent quadrupole plasmons over the metamaterial lattice, leading to a stronger molecular signal from the system. Our metamaterial approach provides a robust way to construct ideal hot-spots over the sample, paving the way toward a reliable sensing platform of advanced infrared inspection technologies. Published by AIP Publishing.
Note
This is an Accepted Manuscript of an article published by American Institute of Physics
Published Date
2017-12-11
Publication Title
Applied Physics Letters
Volume
volume111
Issue
issue24
Publisher
American Institute of Physics
Start Page
243106
ISSN
0003-6951
NCID
AA00543431
Content Type
Journal Article
language
日本語
OAI-PMH Set
岡山大学
Copyright Holders
https://creativecommons.org/licenses/by-nc-nd/4.0/deed.ja
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isVersionOf https://doi.org/10.1063/1.5004703