Infrared/terahertz double resonance for chemical remote sensing: Signatures and performance predictions


Conference Paper

Single resonance chemical remote sensing, such as Fourier-transform infrared spectroscopy, has limited recognition specificity because of atmospheric pressure broadening. Active interrogation techniques promise much greater chemical recognition that can overcome the limits imposed by atmospheric pressure broadening. Here we introduce infrared - terahertz (IR/THz) double resonance spectroscopy as an active means of chemical remote sensing that retains recognition specificity through rare, molecule-unique coincidences between IR molecular absorption and a line-tunable CO2 excitation laser. The laser-induced double resonance is observed as a modulated THz spectrum monitored by a THz transceiver. As an example, our analysis indicates that a 1 ppm cloud of CH3F 100 m thick can be detected at distances up to 1 km using this technique. © 2010 Copyright SPIE - The International Society for Optical Engineering.

Full Text

Duke Authors

Cited Authors

  • Phillips, DJ; Tanner, EA; Everitt, HO; Medvedev, IR; Neese, CF; Holt, J; De Lucia, FC

Published Date

  • June 22, 2010

Published In

Volume / Issue

  • 7671 /

International Standard Serial Number (ISSN)

  • 0277-786X

International Standard Book Number 13 (ISBN-13)

  • 9780819481351

Digital Object Identifier (DOI)

  • 10.1117/12.853309

Citation Source

  • Scopus