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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: G. I. Stegeman
  • Vol. 23, Iss. 5 — May. 1, 2006
  • pp: 801–811

Optical-fiber surface-plasmon-resonance sensor employing long-period fiber gratings in multiplexing

Yue-Jing He, Yu-Lung Lo, and Jen-Fa Huang  »View Author Affiliations


JOSA B, Vol. 23, Issue 5, pp. 801-811 (2006)
http://dx.doi.org/10.1364/JOSAB.23.000801


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Abstract

A new type of optical-fiber surface-plasmon-resonance (SPR) sensor based on a thin metallic film and long-period fiber gratings for measuring small changes of refractive index of analyte is presented. This sensor simply employs a long-period fiber grating with a proper period to couple a core mode ( HE 11 ) to the copropagating cladding mode that can excite a surface-plasmon wave (SPW). The mainly theoretical base used to analyze this new structure is the unconjugated form of coupled-mode equations. In this new SPR sensor, the variation of the refractive index of analyte is determined by monitoring the change of the transmitted core mode power, which is calculated by unconjugated two-mode coupled-mode equations at a fixed wavelength. The numerical results have demonstrated that this new and simple configuration may be used as a highly sensitive amplitude sensor. As far as the excitation of SPW, the model of numerical simulation, and the complexity of measurement equipment are concerned, this new structure is superior to the proposed sensor, consisting of a bent polished single-mode SPR optical fiber. Furthermore, the structure can be easily adapted for a SPR fiber optical probe if a mirror is deposited on the fiber tip.

© 2006 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(240.6680) Optics at surfaces : Surface plasmons
(240.6690) Optics at surfaces : Surface waves

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: August 8, 2005
Revised Manuscript: November 30, 2005
Manuscript Accepted: December 2, 2005

Virtual Issues
Vol. 1, Iss. 6 Virtual Journal for Biomedical Optics

Citation
Yue-Jing He, Yu-Lung Lo, and Jen-Fa Huang, "Optical-fiber surface-plasmon-resonance sensor employing long-period fiber gratings in multiplexing," J. Opt. Soc. Am. B 23, 801-811 (2006)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-23-5-801

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