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26 September 2007 On the relative utility of infrared (IR) versus terahertz (THz) for optical sensors
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Pacific Northwest National Laboratory (PNNL) has active programs investigating the optical absorption strengths of several types of molecules including toxic industrial chemicals (TICs), microbiological threats such as bacteria, as well as explosives such as RDX, PETN and TNT. While most of our work has centered on the mid-infrared domain (600 to 6,500 cm-1), more recent work has also included work in the far-infrared, also called the terahertz (THz) region (500 to ~8 cm-1). Using Fourier transform infrared spectroscopy, we have been able to compare the relative, and in some cases absolute, IR/THz cross sections of a number of species in the solid and liquid phases. The relative band strengths of a number of species of interest are discussed in terms of both experimental and computational results.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
T. J. Johnson, N. B. Valentine, P. L. Gassman, D. A. Atkinson, S. W. Sharpe, and Steven D. Williams "On the relative utility of infrared (IR) versus terahertz (THz) for optical sensors", Proc. SPIE 6756, Chemical and Biological Sensors for Industrial and Environmental Monitoring III, 675604 (26 September 2007);

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