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

Dane J. Phillips; Elizabeth A. Tanner; Henry O. Everitt; Ivan R. Medvedev; Christopher F. Neese; Jennifer Holt; Frank C. De Lucia

doi:10.1117/12.853309

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26 April 2010 Infrared/terahertz double resonance for chemical remote sensing: signatures and performance predictions

Dane J. Phillips, Elizabeth A. Tanner, Henry O. Everitt, Ivan R. Medvedev, Christopher F. Neese, Jennifer Holt, Frank C. De Lucia

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Proceedings Volume 7671, Terahertz Physics, Devices, and Systems IV: Advanced Applications in Industry and Defense; 76710F (2010) https://doi.org/10.1117/12.853309
Event: SPIE Defense, Security, and Sensing, 2010, Orlando, Florida, United States

Abstract

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.

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Dane J. Phillips, Elizabeth A. Tanner, Henry O. Everitt, Ivan R. Medvedev, Christopher F. Neese, Jennifer Holt, and Frank C. De Lucia "Infrared/terahertz double resonance for chemical remote sensing: signatures and performance predictions", Proc. SPIE 7671, Terahertz Physics, Devices, and Systems IV: Advanced Applications in Industry and Defense, 76710F (26 April 2010); https://doi.org/10.1117/12.853309

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