Abstract
A high-sensitive polarized surface-enhanced infrared absorption (polarized SEIRA) is proposed and demonstrated by utilizing the resonant coupling of Fano-resonant mode of the asymmetric metamaterials and IR vibrational mode of a polymer nano-film. The asymmetric metamaterials consisting of an Au nano-rod pair with a coupling nano-antenna were fabricated and characterized to demonstrate the controlled Fano resonances at 1730 cm-1, which spectrally overlapped with the C=O stretching vibrational mode. In the co-polarized SEIRA measurement, the C=O mode of the PMMA nano-film was clearly observed as a conventional anti-resonant peak within the Fano line-shape of the metamaterial. For the cross-polarized case, on the other hand, a distinctive dip appeared within a cross-polarized transmission peak of the metamaterial. Since the unwanted background is strongly suppressed in the cross-polarized detection scheme, the signal contrast was dramatically improved, allowing for the attomole detection of the C=O bond in the far-field measurement. Our metamaterial approach achieves the significant improvement of signal-to-background ratio in the far-field measurement, thus paving the way toward the high-sensitive analysis of functional group in direct IR spectroscopy.
| Original language | English |
|---|---|
| Title of host publication | Metamaterials, Metadevices, and Metasystems 2016 |
| Publisher | SPIE |
| Volume | 9918 |
| ISBN (Electronic) | 9781510602274 |
| DOIs | |
| Publication status | Published - 2016 |
| Event | Metamaterials, Metadevices, and Metasystems 2016 - San Diego, United States Duration: Aug 28 2016 → Sep 1 2016 |
Other
| Other | Metamaterials, Metadevices, and Metasystems 2016 |
|---|---|
| Country | United States |
| City | San Diego |
| Period | 8/28/16 → 9/1/16 |
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Keywords
- Fano resonances
- Plasmonic metamaterials
- Plasmonic sensors
- SEIRA
- Symmetry breaking
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering
Cite this
Controlled Fano resonances via symmetry breaking in metamaterials for high-sensitive infrared spectroscopy. / Hara, Shuhei; Ishikawa, Atsushi; Tanaka, Takuo; Hayashi, Yasuhiko; Tsuruta, Kenji.
Metamaterials, Metadevices, and Metasystems 2016. Vol. 9918 SPIE, 2016. 991814.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Controlled Fano resonances via symmetry breaking in metamaterials for high-sensitive infrared spectroscopy
AU - Hara, Shuhei
AU - Ishikawa, Atsushi
AU - Tanaka, Takuo
AU - Hayashi, Yasuhiko
AU - Tsuruta, Kenji
PY - 2016
Y1 - 2016
N2 - A high-sensitive polarized surface-enhanced infrared absorption (polarized SEIRA) is proposed and demonstrated by utilizing the resonant coupling of Fano-resonant mode of the asymmetric metamaterials and IR vibrational mode of a polymer nano-film. The asymmetric metamaterials consisting of an Au nano-rod pair with a coupling nano-antenna were fabricated and characterized to demonstrate the controlled Fano resonances at 1730 cm-1, which spectrally overlapped with the C=O stretching vibrational mode. In the co-polarized SEIRA measurement, the C=O mode of the PMMA nano-film was clearly observed as a conventional anti-resonant peak within the Fano line-shape of the metamaterial. For the cross-polarized case, on the other hand, a distinctive dip appeared within a cross-polarized transmission peak of the metamaterial. Since the unwanted background is strongly suppressed in the cross-polarized detection scheme, the signal contrast was dramatically improved, allowing for the attomole detection of the C=O bond in the far-field measurement. Our metamaterial approach achieves the significant improvement of signal-to-background ratio in the far-field measurement, thus paving the way toward the high-sensitive analysis of functional group in direct IR spectroscopy.
AB - A high-sensitive polarized surface-enhanced infrared absorption (polarized SEIRA) is proposed and demonstrated by utilizing the resonant coupling of Fano-resonant mode of the asymmetric metamaterials and IR vibrational mode of a polymer nano-film. The asymmetric metamaterials consisting of an Au nano-rod pair with a coupling nano-antenna were fabricated and characterized to demonstrate the controlled Fano resonances at 1730 cm-1, which spectrally overlapped with the C=O stretching vibrational mode. In the co-polarized SEIRA measurement, the C=O mode of the PMMA nano-film was clearly observed as a conventional anti-resonant peak within the Fano line-shape of the metamaterial. For the cross-polarized case, on the other hand, a distinctive dip appeared within a cross-polarized transmission peak of the metamaterial. Since the unwanted background is strongly suppressed in the cross-polarized detection scheme, the signal contrast was dramatically improved, allowing for the attomole detection of the C=O bond in the far-field measurement. Our metamaterial approach achieves the significant improvement of signal-to-background ratio in the far-field measurement, thus paving the way toward the high-sensitive analysis of functional group in direct IR spectroscopy.
KW - Fano resonances
KW - Plasmonic metamaterials
KW - Plasmonic sensors
KW - SEIRA
KW - Symmetry breaking
UR - http://www.scopus.com/inward/record.url?scp=85008500283&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85008500283&partnerID=8YFLogxK
U2 - 10.1117/12.2237559
DO - 10.1117/12.2237559
M3 - Conference contribution
AN - SCOPUS:85008500283
VL - 9918
BT - Metamaterials, Metadevices, and Metasystems 2016
PB - SPIE
ER -