23 February 2013 Aperture-less terahertz near-field imaging
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Terahertz based spectroscopy and imaging has become an active field of research in the past decade for a plethora of applications including security screening, biomedical imaging, chemical analysis, and investigation of carrier dynamics. Several advantages exist for the use of THz techniques since investigation of a sample can be performed without contact or ionization; however, fine detail is difficult to determine due to the diffraction limit of the radiation. The resolution limit of THz imaging and sensing can be overcome by the incorporation of near-field optical techniques; which can allow image resolution as fine as tens of nanometers at THz frequencies. With this expanded resolution capability, THz imaging can decipher micro- and nano-structural information which, when coupled with the non-contact features of these techniques, makes THz spectroscopy ideal for the analysis micro and nano-optical devices. In this study, we demonstrate the development and performance of an aperture-less near-field system which has been integrated to perform highly-spatially resolved Terahertz Time-Domain Spectroscopic (THz-TDS) imaging.
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William E. Baughman, Zachary Smithson, Mathieu Baker, David S. Wilbert, Patrick Kung, Seongsin M. Kim, "Aperture-less terahertz near-field imaging", Proc. SPIE 8585, Terahertz and Ultrashort Electromagnetic Pulses for Biomedical Applications, 858510 (23 February 2013); doi: 10.1117/12.2005688; https://doi.org/10.1117/12.2005688

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