MIOMD-XI Speakers    
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1.  Dr. Henry Everitt, Army' Aviation & Missile Research, Development, and Engineering Center, USA
Late-Breaking Results: Double Resonance Spectroscopy for Remote Sensing of Trace Molecular Gases
Speaker Biography: Dr. Everitt is the chief scientist of the Army's Aviation & Missile Research, Development, and Engineering Center, Weapons Sciences Directorate. There, he leads two active research groups and advises the Army and DoD on a variety of emerging technologies. One lab focuses on plasmonics and the ultrafast optical characterization of wide bandgap semiconductor heterostructures and nano structures. Another lab focuses on developing THz spectroscopic and imaging techniques, serving as an honest broker for the Army in emerging THz technologies.

Summary: The remote sensing of gases in complex mixtures at atmospheric pressure is a challenging problem and much attention has been paid to it. The most fundamental difference between this application and highly successful astrophysical and upper atmospheric remote sensing is the line width associated with atmospheric pressure broadening, ~ 5 GHz in all spectral regions. This talk will quantitatively present a new approach that would use a short pulse infrared laser to modulate the submillimeter/terahertz (SMM/THz) spectral absorptions on the time scale of atmospheric relaxation. This scheme has three important attributes: (1) The time resolved pump makes it possible and efficient to separate signal from atmospheric and system clutter, thereby gaining as much as a factor of 106 in sensitivity, (2) The 3-D information matrix (infrared pump laser frequency, SMM/THz probe frequency, and time resolved SMM/THz relaxation) can provide orders of magnitude greater specificity than a sensor that uses only one of these three dimensions, and (3) The congested and relatively weak spectra associated with large molecules can actually be an asset because the usually deleterious effect of their overlapping spectra can be used to increase signal strength.
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