High-density and long-lived plasmonic hot-spots are an ideal system for high-sensitive surface-enhanced infrared absorption (SEIRA), but these conditions are 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.
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11 December 2017
Research Article|
December 13 2017
Robust plasmonic hot-spots in a metamaterial lattice for enhanced sensitivity of infrared molecular detection
Atsushi Ishikawa
;
Atsushi Ishikawa
1
Department of Electrical and Electronic Engineering, Okayama University
, Okayama, Okayama 700-8530, Japan
2
NSF Nanoscale Science and Engineering Center, University of California
, Berkeley, California 94720, USA
3
Metamaterials Laboratory, RIKEN
, Wako, Saitama 351-0198, Japan
4
Innovative Photon Manipulation Research Team, RIKEN Center for Advanced Photonics
, Wako, Saitama 351-0198, Japan
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Shuhei Hara;
Shuhei Hara
b)
1
Department of Electrical and Electronic Engineering, Okayama University
, Okayama, Okayama 700-8530, Japan
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Takuo Tanaka;
Takuo Tanaka
3
Metamaterials Laboratory, RIKEN
, Wako, Saitama 351-0198, Japan
4
Innovative Photon Manipulation Research Team, RIKEN Center for Advanced Photonics
, Wako, Saitama 351-0198, Japan
5
Department of Chemical Science and Engineering, Tokyo Institute of Technology
, Yokohama, Kanagawa 226-8503, Japan
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Xiang Zhang;
Xiang Zhang
c)
2
NSF Nanoscale Science and Engineering Center, University of California
, Berkeley, California 94720, USA
6
Materials Sciences Division, Lawrence Berkeley National Laboratory
, Berkeley, California 94720, USA
7
Department of Physics, King Abdulaziz University
, Jeddah 21589, Saudi Arabia
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Kenji Tsuruta
Kenji Tsuruta
1
Department of Electrical and Electronic Engineering, Okayama University
, Okayama, Okayama 700-8530, Japan
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a)
Electronic mail: a-ishikawa@okayama-u.ac.jp.
b)
A. Ishikawa and S. Hara contributed equally to this work.
c)
Electronic mail: xiang@berkeley.edu.
Appl. Phys. Lett. 111, 243106 (2017)
Article history
Received:
September 14 2017
Accepted:
November 28 2017
Citation
Atsushi Ishikawa, Shuhei Hara, Takuo Tanaka, Xiang Zhang, Kenji Tsuruta; Robust plasmonic hot-spots in a metamaterial lattice for enhanced sensitivity of infrared molecular detection. Appl. Phys. Lett. 11 December 2017; 111 (24): 243106. https://doi.org/10.1063/1.5004703
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