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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 8 — Apr. 15, 2012
  • pp: 1304–1306

Double resonance 1-D photonic crystal cavities for single-molecule mid-infrared photothermal spectroscopy: theory and design

Hongtao Lin, Zou Yi, and Juejun Hu  »View Author Affiliations

Optics Letters, Vol. 37, Issue 8, pp. 1304-1306 (2012)

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We propose and theoretically examine a novel mid-infrared (mid-IR) photothermal spectroscopic sensing technique capable of detecting a single small molecule. Our conceptual design attains such high sensitivity by leveraging dramatically amplified photothermal effects in an optical nanocavity doubly resonant at both mid-IR pump and near-IR probe wavelengths. Unlike conventional mid-IR spectroscopy, the technique eliminates the need for cryogenically cooled mid-IR photodetectors, as optical detection is performed solely at the near-IR probe wavelength. A device design based on nested one-dimensional nanobeam photonic crystal cavities is numerically analyzed to demonstrate the technique’s potential for single small gas molecule detection.

© 2012 Optical Society of America

OCIS Codes
(130.6010) Integrated optics : Sensors
(300.6430) Spectroscopy : Spectroscopy, photothermal
(140.3945) Lasers and laser optics : Microcavities
(230.5298) Optical devices : Photonic crystals

ToC Category:

Original Manuscript: December 1, 2011
Revised Manuscript: January 10, 2012
Manuscript Accepted: February 15, 2012
Published: April 6, 2012

Hongtao Lin, Zou Yi, and Juejun Hu, "Double resonance 1-D photonic crystal cavities for single-molecule mid-infrared photothermal spectroscopy: theory and design," Opt. Lett. 37, 1304-1306 (2012)

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