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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 22 — Nov. 4, 2013
  • pp: 26714–26720

Bending effect on modal interference in a fiber taper and sensitivity enhancement for refractive index measurement

Li-Peng Sun, Jie Li, Yanzhen Tan, Shuai Gao, Long Jin, and Bai-Ou Guan  »View Author Affiliations


Optics Express, Vol. 21, Issue 22, pp. 26714-26720 (2013)
http://dx.doi.org/10.1364/OE.21.026714


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Abstract

We demonstrate the bending effect of microfiber on interference fringes in a compact taper-based modal interferometer and sensitivity for refractive index (RI) measurement. For the bend curvature ranging from 0 to 0.283 mm−1, the measured RI sensitivity distinctively increases from 342.5 nm/RIU (refractive-index unit) to 1192.7nm/RIU around RI = 1.333 and from 3847.1 nm/RIU to 11006.0 nm/RIU around RI = 1.430, respectively. Theoretical analysis reveals that such enhancement is determined by the dispersion property of the intermodal index rather than other parameters, such as the variation of the straightforward evanescent field. The magnitude of sensitivity varies as a function of the microfiber bend curvature. Approaching a critical curvature (the intermodal-index dispersion factor approaches zero), the sensitivity is significantly enhanced, exhibiting great potential in RI sensing areas.

© 2013 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(230.1150) Optical devices : All-optical devices
(230.3990) Optical devices : Micro-optical devices
(260.3160) Physical optics : Interference

ToC Category:
Sensors

History
Original Manuscript: September 3, 2013
Revised Manuscript: October 20, 2013
Manuscript Accepted: October 23, 2013
Published: October 29, 2013

Citation
Li-Peng Sun, Jie Li, Yanzhen Tan, Shuai Gao, Long Jin, and Bai-Ou Guan, "Bending effect on modal interference in a fiber taper and sensitivity enhancement for refractive index measurement," Opt. Express 21, 26714-26720 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-22-26714


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