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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 9 — Apr. 25, 2011
  • pp: 8930–8938

Modeling and analysis of localized biosensing and index sensing by introducing effective phase shift in microfiber Bragg grating (µFBG)

Guanghui Wang, Perry Ping Shum, Ho-pui Ho, Xia Yu, Dora Juan Juan Hu, Ying Cui, Limin Tong, and Chinlon Lin  »View Author Affiliations


Optics Express, Vol. 19, Issue 9, pp. 8930-8938 (2011)
http://dx.doi.org/10.1364/OE.19.008930


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Abstract

We report a novel micro-fiber Bragg grating (µFBG) sensor that takes advantage of the degeneracy of stop-band and rapid emergence of spectral modes when an effective phase shift occurs. The phase shift can be enabled by a range of perturbations in a central segment of the grating, including monolayer immobilization of bio-molecules or change in refractive index in the surrounding, thereby constituting the possibility of a highly sensitive sensor with the merit of scalable performance. The use of µFBG ensures strong evanescent field coupling to the surrounding in order to maximize signal transduction. Simulation results indicate very favorable sensor signal characteristics such as large wavelength shift and sharp reflection dips. A general relation between the peak position within the stop-band and the amount of effective phase shift is also provided, and may generally serve as helpful guideline for FBG sensor design. A typical µFBG sensor device may detect surface protein/DNA adsorption with limit-of-detection (LOD) as low as 3.3 pg.mm−2 for surface mass density and 51.8 fg for total mass. For refractive index (RI) sensing, the LOD is 2.5*10−6 refractive index unit (RIU).

© 2011 OSA

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.3735) Fiber optics and optical communications : Fiber Bragg gratings
(130.3990) Integrated optics : Micro-optical devices

ToC Category:
Sensors

History
Original Manuscript: November 30, 2010
Revised Manuscript: February 16, 2011
Manuscript Accepted: February 22, 2011
Published: April 22, 2011

Virtual Issues
Vol. 6, Iss. 5 Virtual Journal for Biomedical Optics

Citation
Guanghui Wang, Perry Ping Shum, Ho-pui Ho, Xia Yu, Dora Juan Juan Hu, Ying Cui, Limin Tong, and Chinlon Lin, "Modeling and analysis of localized biosensing and index sensing by introducing effective phase shift in microfiber Bragg grating (µFBG)," Opt. Express 19, 8930-8938 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-9-8930


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