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Fan-Shaped Gold Nanoantennas above Reflective Substrates for Surface-Enhanced Infrared Absorption (SEIRA)
Abstract
Here, we report a new nanoantenna for surface-enhanced infrared absorption (SEIRA) detection, consisting of a fan-shaped Au structure positioned at a well-specified distance above a reflective plane with an intervening silica spacer layer. We examine how to optimize both the antenna dimensions and the spacer layer for optimal SEIRA enhancement of the C-H stretching mode. This tunable 3D geometry yields a theoretical SEIRA enhancement factor of 10(5), corresponding to the experimental detection of 20-200 zeptomoles of octadecanethiol, using a standard commercial FTIR spectrometer. Experimental studies illustrate the sensitivity of the observed SEIRA signal to the gap dimensions. The optimized antenna structure exhibits an order of magnitude greater SEIRA sensitivity than previous record-setting designs.
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Metadata
- Authors
- Brown, L. V., Yang, X., Zhao, K., Zheng, B. Y., Nordlander, P., & Halas, N. J.
- Venue
- Nano Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2015-01-12
- Volume
- 15
- Issue
- 2
- Pages
- 1272-1280
- ISSN
- 1530-6984 (ISSN-L)
- 1530-6992
- OpenAlex
- W2329063793
- Cited by
- 266
- References
- 43
- FWCI
- 17.14
- Type
- journal article
- Language
- en
- Open access
- closed
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