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Directional Nanoplasmonic Antennas for Self-Referenced Refractometric Molecular Analysis
Chalmers University of Technology, Sweden.ORCID iD: 0000-0002-4437-6291
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2014 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 118, no 36, p. 21075-21080Article in journal (Refereed) Published
Abstract [en]

Localized surface-plasmon resonance (LSPR) sensors are typically based on tracing resonance peak shifts that precisely follow changes in the local refractive index. Such measurements usually require a spectrometer, a stable light source, and an accurate LSPR position tracing technique. As a simple but efficient alternative, we investigated a self-referenced single-wavelength sensing scheme based on angle-dependent and highly directional radiation patterns originating from a monolayer of asymmetric gold nanodimers. We found that one could easily trace a model biotinneutravidin recognition reaction as well as minute bulk refractive index changes, by measuring the intensity ratio between the light scattered in two different directions with respect to the dimers. The refractometric resolution of the methodology was estimated to be on the order of Delta n approximate to 10(-5) RIU. These results may be particularly useful for label-free biosensing applications that require a combination of simple and cost-effective optical readout with a reasonable sensitivity.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2014. Vol. 118, no 36, p. 21075-21080
National Category
Nano Technology Atom and Molecular Physics and Optics Other Physics Topics
Research subject
Physics
Identifiers
URN: urn:nbn:se:kth:diva-197588DOI: 10.1021/jp5064929ISI: 000341619500040Scopus ID: 2-s2.0-84914127202OAI: oai:DiVA.org:kth-197588DiVA, id: diva2:1165959
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Note

QC 20171214

Available from: 2017-12-14 Created: 2017-12-14 Last updated: 2017-12-14Bibliographically approved

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Svedendahl, Mikael

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  • apa
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  • de-DE
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Output format
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