Plasmonics

, 6:665

Improvement of Figure of Merit for Gold Nanobar Array Plasmonic Sensors

Article

DOI: 10.1007/s11468-011-9249-9

Cite this article as:
Ye, J. & Van Dorpe, P. Plasmonics (2011) 6: 665. doi:10.1007/s11468-011-9249-9
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Abstract

We report a strategy to improve two types of the figure of merit (FOM and FOM*) of the refractive index sensitivity of a gold nanobar array localized surface plasmon resonance (LSPR) biosensor by simply placing it close to a thin gold film with a dielectric spacer. The thickness of the dielectric spacer determines the plasmon coupling strength between the gold nanobars and the gold film and consequently the FOM and FOM* of the biosensor. From our calculations, when the spacer thickness is 20 nm, the FOM and FOM* reach maximal (4.68 and 310, respectively) and the sensitivity remains at a high value of 600 nm per refractive index unit. This biosensor scheme is practically realizable, and this strategy is also potentially applicable to the LSPR biosensors with other geometries.

Keywords

NanobarLocalized surface plasmon resonanceFigure of meritSensorFinite difference time domain

Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.IMEC vzwLeuvenBelgium
  2. 2.Chemistry DepartmentKatholieke Universiteit LeuvenLeuvenBelgium