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, William E. Baughman, Zachary Smithson, Zachary Smithson, Mathieu Baker, Mathieu Baker, David S. Wilbert, David S. Wilbert, Patrick Kung, Patrick Kung, Seongsin M. Kim, 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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