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Near-Field Characterization of Conductive Micro-resonators for Terahertz Sensing

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THz for CBRN and Explosives Detection and Diagnosis

Abstract

Near-field (NF) terahertz (THz) time-domain spectroscopy (TDS) is an excellent tool for direct studies of THz electromagnetic resonances occurring on a micrometre scale. Micro-resonators are at the heart of numerous promising THz sensing and detecting solutions. Experimental studies of individual micrometre-scale THz resonances are essential, yet extremely challenging for the common far-field spectroscopic methods due to extreme sensitivity requirements. NF THz spectroscopy and microscopy are non-contact techniques for spectroscopic studies of individual micro-resonators and mapping the field patterns of THz resonant modes excited in individual conductive or insulating micro-objects. They give access to essential parameters of micro-resonators, including their resonance frequency, local field enhancement and quality factors. It allows for material and structural characterisation of micro-objects. Using the example of carbon micro-fibres, we show the advantages of NF THz TDS for non-contact THz conductivity probing and direct observation of the fundamental and the third-order surface-plasmon resonance modes in conductive THz micro-resonators.

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Authors and Affiliations

  1. Department of EEE, University College London, London, UK

    Irina Khromova & Oleg Mitrofanov

  2. CINT, Sandia National Laboratories, Livermore, California, USA

    Oleg Mitrofanov

Authors
  1. Irina Khromova
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  2. Oleg Mitrofanov
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Corresponding author

Correspondence to Irina Khromova .

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Editors and Affiliations

  1. Materials & Engineering Research In, Sheffield Halam University, Sheffield, United Kingdom

    Mauro F. Pereira

  2. Campus Irapuato-Salamanca, Univ de Guanajuato, Dept Ingeniería Campus Irapuato-Salamanca, Salamanca, Guanajuato, Mexico

    Oleksiy Shulika

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Khromova, I., Mitrofanov, O. (2017). Near-Field Characterization of Conductive Micro-resonators for Terahertz Sensing. In: Pereira, M., Shulika, O. (eds) THz for CBRN and Explosives Detection and Diagnosis. NATO Science for Peace and Security Series B: Physics and Biophysics. Springer, Dordrecht. https://doi.org/10.1007/978-94-024-1093-8_3

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