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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. 7, Iss. 7 — Jun. 25, 2012

Integrated fiber optic incoherent broadband cavity enhanced absorption spectroscopy detector for near-IR absorption measurements of nanoliter samples

Anthony L. Gomez, Ronald F. Renzi, Julia A. Fruetel, and Ray P. Bambha  »View Author Affiliations


Applied Optics, Vol. 51, Issue 14, pp. 2532-2540 (2012)
http://dx.doi.org/10.1364/AO.51.002532


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Abstract

An integrated fiber-optic sensor is described that uses incoherent broadband cavity enhanced absorption spectroscopy for sensitive detection of aqueous samples in nanoliter volumes. Absorption was measured in a 100 µm gap between the ends of two short segments of multimode graded-index fiber that were integrated into a capillary using a precision machined V-grooved fixture that allowed for passive fiber alignment. The other ends of the fibers were coated with dielectric mirrors to form a 9.5 cm optical resonator. Light from a fiber-coupled superluminescent diode was directly coupled into one end of the cavity, and transmission was measured using a fiber-coupled silicon photodiode. Dilute aqueous solutions of near infrared dye were used to determine the minimum detectable absorption change of 2.4×104 under experimental conditions in which pressure fluctuations limited performance. We also determined that the absolute minimum detectable absorption change would be 1.6×105 for conditions of constant pressure in which absorption measurement is limited by electronic and optical noise. Tolerance requirements for alignment are also presented.

© 2012 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(130.3120) Integrated optics : Integrated optics devices
(290.5850) Scattering : Scattering, particles
(300.1030) Spectroscopy : Absorption
(280.1415) Remote sensing and sensors : Biological sensing and sensors

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: February 3, 2012
Revised Manuscript: February 3, 2012
Manuscript Accepted: February 3, 2012
Published: May 4, 2012

Virtual Issues
Vol. 7, Iss. 7 Virtual Journal for Biomedical Optics

Citation
Anthony L. Gomez, Ronald F. Renzi, Julia A. Fruetel, and Ray P. Bambha, "Integrated fiber optic incoherent broadband cavity enhanced absorption spectroscopy detector for near-IR absorption measurements of nanoliter samples," Appl. Opt. 51, 2532-2540 (2012)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-51-14-2532

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