8 September 2004 THz time domain sensing and imaging
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Over the past decade the experimental technique of THz time domain spectroscopy (THz-TDS) has proved to be a versatile method for investigating a wide range of phenomena in the THz or far infrared spectral region from 100 GHz to 5 THz. THz-TDS has wide potential for sensing and imaging. The experimental technique is described along with recent results on THz beam propagation for long base-line THz measurements. THz imaging has been demonstrated using both quasi-optical and synthetic aperture approaches, results are presented including images of scatterers as well as non-destructive evaluation of ceramics. Two potential sensing applications of THz-TDS are discussed, thin film characterization and use of waveguides for sensing.
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R. Alan Cheville, R. Alan Cheville, Matthew T. Reiten, Matthew T. Reiten, John O'Hara, John O'Hara, Daniel R. Grischkowsky, Daniel R. Grischkowsky, } "THz time domain sensing and imaging", Proc. SPIE 5411, Terahertz for Military and Security Applications II, (8 September 2004); doi: 10.1117/12.555373; https://doi.org/10.1117/12.555373

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