Refractometric Sensing Using Propagating versus Localized Surface Plasmons: A Direct Comparison
Journal article, 2009

We present a direct experimental comparison between the refractive index sensing capabilities of localized surface plasmon resonances (LSPRs) in gold nanodisks and propagating surface plasmon resonances (SPRs) on 50 nm gold films. The comparison is made using identical experimental conditions, and for the same resonance wavelength, λSP = 700 nm. Biosensing experiments with biotin-avidin coupling reveal that the two sensing platforms have very similar performance, despite a superior bulk refractive index sensing figure of merit for the SPR sensor. The results demonstrate that LSPR sensing based on simple transmission or reflection measurements is a highly competitive technique compared to the traditional SPR sensor.

Author

Mikael Svedendahl

Chalmers, Applied Physics, Bionanophotonics

Si Chen

Chalmers, Applied Physics, Bionanophotonics

Alexander Dmitriev

Chalmers, Applied Physics, Bionanophotonics

Mikael Käll

Chalmers, Applied Physics, Bionanophotonics

Nano Letters

1530-6984 (ISSN) 1530-6992 (eISSN)

Vol. 9 12 4428-

Subject Categories

Atom and Molecular Physics and Optics

DOI

10.1021/nl902721z

More information

Created

10/7/2017