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Title: Plasmonic crystal enhanced refractive index sensing

We demonstrate experimentally how the local anisotropy of the dispersion relation of surface plasmon modes propagating over periodic metal gratings can lead to an enhancement of the figure of merit of refractive index sensors. Exploiting the possibility to acquire defocused images of the Fourier space of a highly stable leakage radiation microscope, we report a twofold increase in sensing sensitivity close to the band gap of a one-dimensional plasmonic crystal where the anisotropy of the band structure is the most important. A practical sensing resolution of O(10{sup −6}) refractive index units is demonstrated.
Authors:
; ; ;  [1]
  1. ISIS and icRFC, University of Strasbourg and CNRS, 8 allée Gaspard Monge, 67000 Strasbourg (France)
Publication Date:
OSTI Identifier:
22303839
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 25; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; CRYSTALS; DISPERSION RELATIONS; MICROSCOPES; PERIODICITY; PLASMONS; REFRACTIVE INDEX; RESOLUTION; SENSITIVITY; SURFACES; WAVE PROPAGATION