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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 34, Iss. 3 — Feb. 1, 2009
  • pp: 322–324

Ultrasensitive photonic crystal fiber refractive index sensor

Darran K.C. Wu, Boris T. Kuhlmey, and Benjamin J. Eggleton  »View Author Affiliations

Optics Letters, Vol. 34, Issue 3, pp. 322-324 (2009)

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We introduce a microfluidic refractive index sensor based on a directional coupler architecture using solid-core photonic crystal fibers. The sensor achieves very high sensitivity by coupling the core mode to a mode in the adjacent fluid-filled waveguide that is beyond modal cutoff, and with strong field overlap. We demonstrate the device through the selective infiltration of a single hole with fluid along a microstructured optical fiber. A detection limit of 4.6 × 10 7 refractive index units has been derived from measurements with a sensitivity of 30,100 nm per refractive index unit, which is the highest for a fiber device to date.

© 2009 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.4005) Fiber optics and optical communications : Microstructured fibers
(060.5295) Fiber optics and optical communications : Photonic crystal fibers

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: November 11, 2008
Manuscript Accepted: December 5, 2008
Published: January 27, 2009

Virtual Issues
Vol. 4, Iss. 4 Virtual Journal for Biomedical Optics

Darran K. C. Wu, Boris T. Kuhlmey, and Benjamin J. Eggleton, "Ultrasensitive photonic crystal fiber refractive index sensor," Opt. Lett. 34, 322-324 (2009)

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