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Directional Nanoplasmonic Antennas for Self-Referenced Refractometric Molecular Analysis

Martin Wersäll (Institutionen för teknisk fysik, Bionanofotonik) ; Ruggero Verre (Institutionen för teknisk fysik, Bionanofotonik) ; Mikael Svedendahl (Institutionen för teknisk fysik, Bionanofotonik) ; Peter Johansson (Institutionen för teknisk fysik, Bionanofotonik) ; Mikael Käll (Institutionen för teknisk fysik, Bionanofotonik) ; Timur Shegai (Institutionen för teknisk fysik, Bionanofotonik)
JOURNAL OF PHYSICAL CHEMISTRY C (1932-7447). Vol. 118 (2014), 36, p. 21075-21080.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: surface-plasmon resonance, light-emission, dipoles, sensors, lithography, sensitivity, biosensors, interface, proteins



Denna post skapades 2014-11-12. Senast ändrad 2015-12-17.
CPL Pubid: 205644

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Bionanofotonik (2007-2015)

Ämnesområden

Biologisk fysik

Chalmers infrastruktur

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