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 |
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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 |
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Country/Territory | United States |
City | San Diego |
Period | 8/28/16 → 9/1/16 |
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