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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 10 — May. 11, 2009
  • pp: 7933–7942

Refractive-index sensor based on long-range surface plasmon mode excitation with long-period waveguide grating

Q. Liu and K. S. Chiang  »View Author Affiliations


Optics Express, Vol. 17, Issue 10, pp. 7933-7942 (2009)
http://dx.doi.org/10.1364/OE.17.007933


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Abstract

We propose a refractive-index sensor that operates on the principle of exciting the long-range surface plasmon mode of a metal-coated waveguide with a long-period grating formed in the waveguide, where the wavelength at which the mode excitation occurs serves as a measure of the refractive index of the external medium. We analyze the sensor with a coupled-mode theory and highlight the effects of the waveguide parameters on the loss of the surface plasmon mode and the performance of the sensor. Our results show that the sensor can provide a sharp resonance for high precision measurements and a high sensitivity comparable to that of an optimized bulk prism-based surface plasmon sensor. Our sensor also offers much flexibility in the choice of waveguide parameters for different applications.

© 2009 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(130.6010) Integrated optics : Sensors
(230.7390) Optical devices : Waveguides, planar
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Optics at Surfaces

History
Original Manuscript: March 20, 2009
Revised Manuscript: April 27, 2009
Manuscript Accepted: April 27, 2009
Published: April 28, 2009

Citation
Q. Liu and K. S. Chiang, "Refractive-index sensor based on long-range surface plasmon mode excitation with longperiod waveguide grating," Opt. Express 17, 7933-7942 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-10-7933


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