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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 2, Iss. 10 — Oct. 31, 2007

Intra-cavity absorption spectroscopy with narrow-ridge microfluidic quantum cascade lasers

Mikhail A. Belkin, Marko Lončar, Benjamin G. Lee, Christian Pflügl, Ross Audet, Laurent Diehl, Federico Capasso, David Bour, Scott Corzine, and Gloria Höfler  »View Author Affiliations

Optics Express, Vol. 15, Issue 18, pp. 11262-11271 (2007)

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We demonstrate microfluidic laser intra-cavity absorption spectroscopy with mid-infrared λ≈9µm quantum cascade lasers. A deep-etched narrow ridge waveguide laser is placed in a microfluidic chamber. The evanescent tails of the laser mode penetrate into a liquid on both sides of the ridge. The absorption lines of the liquid modify the laser waveguide loss, resulting in significant changes in the laser emission spectrum and the threshold current. A volume of liquid as small as ~10pL may, in principle, be sufficient for sensing using the proposed technique. This method, similar to the related gas-phase technique, shows promise as a sensitive means of detecting chemicals in small volumes of solutions.

© 2007 Optical Society of America

OCIS Codes
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.5960) Lasers and laser optics : Semiconductor lasers
(220.4000) Optical design and fabrication : Microstructure fabrication
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(300.6340) Spectroscopy : Spectroscopy, infrared

ToC Category:
Lasers and Laser Optics

Original Manuscript: June 18, 2007
Revised Manuscript: August 12, 2007
Manuscript Accepted: August 16, 2007
Published: August 21, 2007

Virtual Issues
Vol. 2, Iss. 10 Virtual Journal for Biomedical Optics

Mikhail A. Belkin, Marko Loncar, Benjamon G. Lee, Christian Pflugl, Ross Audet, Laurent Diehl, Federico Capasso, David Bour, Scott Corzine, and Gloria Hofler, "Intra-cavity absorption spectroscopy with narrow-ridge microfluidic quantum cascade lasers," Opt. Express 15, 11262-11271 (2007)

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