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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 34, Iss. 18 — Sep. 15, 2009
  • pp: 2808–2810

Observation of interference in a fiber taper interferometer with a subwavelength tip and its sensing applications

Yizheng Zhu, Xiaopei Chen, and Anbo Wang  »View Author Affiliations

Optics Letters, Vol. 34, Issue 18, pp. 2808-2810 (2009)

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We present an ultraminiature fiber-optic sensor based on a fiber taper interferometer with a subwavelength tip. The interferometer is fabricated on the end face of a single-mode fiber by wet etching using buffered hydrofluoric acid. The process creates a protruding core on the end face with a tapered shape. Strong interference is observed between the reflections from the fiber cladding and the tip of the taper even for tip size as small as λ 4 . A time-domain analysis of the sensor spectrum recorded during the etching process produces the temporal evolution of both reflections, indicating that the interference mechanism involves intermodal coupling. The interferometer’s sensing application is demonstrated by the effective measurement of refractive index and temperature.

© 2009 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.6780) Instrumentation, measurement, and metrology : Temperature

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: June 16, 2009
Revised Manuscript: July 28, 2009
Manuscript Accepted: August 13, 2009
Published: September 10, 2009

Virtual Issues
Vol. 4, Iss. 11 Virtual Journal for Biomedical Optics

Yizheng Zhu, Xiaopei Chen, and Anbo Wang, "Observation of interference in a fiber taper interferometer with a subwavelength tip and its sensing applications," Opt. Lett. 34, 2808-2810 (2009)

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