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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 21 — Oct. 11, 2010
  • pp: 22174–22186

Ultra-sensitive chemical vapor detection using micro-cavity photothermal spectroscopy

Juejun Hu  »View Author Affiliations

Optics Express, Vol. 18, Issue 21, pp. 22174-22186 (2010)

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In this paper, I systematically investigated Micro-Cavity PhotoThermal Spectroscopy (MC-PTS), a novel technique for ultra-sensitive detection of chemical molecular species. I first derive the photothermal enhancement factor and noise characteristics of the technique using a generic theoretical model, followed by numerical analysis of a design example using chalcogenide glass micro-disk cavities. Guidelines for sensor material selection and device design are formulated based on the theoretical insight. The numerical analysis shows that this technique features a record photothermal enhancement factor of 104 with respect to conventional cavity-enhanced (multi-pass) infrared absorption spectroscopy, and is capable of detecting non-preconcentrated chemical vapor molecules down to the ppt level with a moderate cavity quality factor of 105 and a pump laser power of 0.1 W. Such performance qualifies this technique as one of the most sensitive methods for chemical vapor spectroscopic analysis.

© 2010 OSA

OCIS Codes
(130.3060) Integrated optics : Infrared
(130.3120) Integrated optics : Integrated optics devices
(130.6010) Integrated optics : Sensors
(300.1030) Spectroscopy : Absorption
(300.6430) Spectroscopy : Spectroscopy, photothermal
(140.3948) Lasers and laser optics : Microcavity devices
(070.5753) Fourier optics and signal processing : Resonators

ToC Category:

Original Manuscript: September 3, 2010
Revised Manuscript: September 28, 2010
Manuscript Accepted: September 28, 2010
Published: October 5, 2010

Virtual Issues
Vol. 5, Iss. 14 Virtual Journal for Biomedical Optics

Juejun Hu, "Ultra-sensitive chemical vapor detection using micro-cavity photothermal spectroscopy," Opt. Express 18, 22174-22186 (2010)

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