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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 14 — Jul. 6, 2009
  • pp: 12145–12154

Sensitivity enhancement in grating coupled surface plasmon resonance by azimuthal control

F. Romanato, K. H. Lee, H. K. Kang, G. Ruffato, and C. C. Wong  »View Author Affiliations

Optics Express, Vol. 17, Issue 14, pp. 12145-12154 (2009)

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We present a method for improving the sensing capability of grating coupled surface plasmon resonance (GCSPR) sensors. The grating is rotated azimuthally (φ) until the excitation of double surface plasmon polaritions (SPPs) by a single wavelength is possible. Close to this condition, further tuning of the incident wavelength will merge the double SPPs into a multi-SPP resonance which is angularly broad but spectrally sharp. This is the condition where the momentum vector of the propagating SPP is perpendicular to the incident light momentum. We demonstrate this sensitivity enhancement on a Au grating surface using a dodecanethiol (C12) self-assembled monolayer (SAM). Using this method, a shift in resonance angle as large as 3° can be observed. The simulated sensitivity of this method shows that a sensitivity up to 800°/RIU is achievable, which is one order of magnitude greater than that in a conventional fixed grating (φ=0°) as well as the prism-coupled Kretschmann configuration.

© 2009 OSA

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Optics at Surfaces

Original Manuscript: May 4, 2009
Revised Manuscript: June 15, 2009
Manuscript Accepted: June 15, 2009
Published: July 2, 2009

F. Romanato, K. H. Lee, H. K. Kang, G. Ruffato, and C. C. Wong, "Sensitivity enhancement in grating coupled surface plasmon resonance by azimuthal control," Opt. Express 17, 12145-12154 (2009)

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