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Directional Nanoplasmonic Antennas for Self-Referenced Refractometric Molecular Analysis
Department of Applied Physics, Chalmers University of Technology, Göteborg, Sweden.
Department of Applied Physics, Chalmers University of Technology, Göteborg, Sweden.
Department of Applied Physics, Chalmers University of Technology, Göteborg, Sweden.
Örebro University, School of Science and Technology. Department of Applied Physics, Chalmers University of Technology, Göteborg, Sweden.ORCID iD: 0000-0002-2110-3071
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2014 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 118, no 36, 21075-21080 p.Article 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
2014. Vol. 118, no 36, 21075-21080 p.
National Category
Chemical Sciences
Research subject
Chemistry
Identifiers
URN: urn:nbn:se:oru:diva-37868DOI: 10.1021/jp5064929ISI: 000341619500040OAI: oai:DiVA.org:oru-37868DiVA: diva2:757458
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Available from: 2014-10-22 Created: 2014-10-20 Last updated: 2017-10-17Bibliographically approved

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