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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 8, Iss. 6 — Jun. 27, 2013

Refractive index biosensor based on microstructured optical fiber long-period gratings: a theoretical analysis

Yuefeng Qi, Xiaoqian Gao, and Weihong Bi  »View Author Affiliations


JOSA B, Vol. 30, Issue 5, pp. 1256-1260 (2013)
http://dx.doi.org/10.1364/JOSAB.30.001256


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Abstract

A kind of label-free refractive index biosensor based on long-period gratings (LPGs) inscribed in microstructured optical fibers (MOFs) is theoretically studied. The finite element method is used to visualize the mode field distribution along the grapefruit MOF. The transmission spectrum of LPG in the air or liquid is simulated by the coupled-mode theory. An immobilized biorecognition molecules layer on the inner walls of the holes in the MOF provides the ability to capture analyte molecules selectively. Numerical results show that an ultrahigh refractive index sensitivity of approximately 397.3nm/RIU over the refractive index range of 1.4–1.5 is achieved. Moreover, the sensitivity of the grapefruit MOF can be improved by reducing the periods of gratings. In addition, the shift of the resonant wavelength is linear to the analyte thickness with good sensitivity about 0.6nm/nm. It is expected to play a great role in theoretical guidance for further development of biosensors.

© 2013 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.3735) Fiber optics and optical communications : Fiber Bragg gratings

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: December 7, 2012
Revised Manuscript: March 7, 2013
Manuscript Accepted: March 18, 2013
Published: April 19, 2013

Virtual Issues
Vol. 8, Iss. 6 Virtual Journal for Biomedical Optics

Citation
Yuefeng Qi, Xiaoqian Gao, and Weihong Bi, "Refractive index biosensor based on microstructured optical fiber long-period gratings: a theoretical analysis," J. Opt. Soc. Am. B 30, 1256-1260 (2013)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=josab-30-5-1256


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