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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 34, Iss. 3 — Feb. 1, 2009
  • pp: 392–394

Refractive index sensor based on surface-plasmon interference

Xiaofei Wu, Jiasen Zhang, Jianjun Chen, Chenglong Zhao, and Qihuang Gong  »View Author Affiliations

Optics Letters, Vol. 34, Issue 3, pp. 392-394 (2009)

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We propose a refractive index sensor based on the interference of two surface-plasmon waves on both surfaces of a gold film with a two-slit structure. The phase of the interference was solved, and the dispersion relation of the real part of Au dielectric function was considered. The sensor was performed with Na Cl H 2 O solutions of different concentrations and exhibited a linear response and a high sensitivity of 4547 nm RIU (refractive index unit) to the refractive index change.

© 2009 Optical Society of America

OCIS Codes
(130.6010) Integrated optics : Sensors
(230.3990) Optical devices : Micro-optical devices
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Integrated Optics

Original Manuscript: September 12, 2008
Revised Manuscript: December 12, 2008
Manuscript Accepted: December 12, 2008
Published: January 30, 2009

Xiaofei Wu, Jiasen Zhang, Jianjun Chen, Chenglong Zhao, and Qihuang Gong, "Refractive index sensor based on surface-plasmon interference," Opt. Lett. 34, 392-394 (2009)

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