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Near-field characterization of conductive micro-resonators for terahertz sensing

Khromova, I; Mitrofanov, O; (2017) Near-field characterization of conductive micro-resonators for terahertz sensing. In: Pereira, MF and Shulika, O, (eds.) Proceedings of the NATO Advanced Research Workshop on THz for CBRN and Explosives Detection and Diagnosis. (pp. pp. 23-28). Springer: Dordrecht, Netherlands. Green open access

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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 micrometrescale 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 microfibres, we show the advantages of NF THz TDS for non-contact THz conductivity probing and direct observation of the fundamental and the third-order surfaceplasmon resonance modes in conductive THz micro-resonators.

Type: Proceedings paper
Title: Near-field characterization of conductive micro-resonators for terahertz sensing
Event: NATO Advanced Research Workshop on THz for CBRN and Explosives Detection and Diagnosis, 3–5 November 2015, Çeşme, Turkey
ISBN-13: 9789402410921
Open access status: An open access version is available from UCL Discovery
DOI: 10.1007/978-94-024-1093-8_3
Publisher version: https://doi.org/10.1007/978-94-024-1093-8_3
Language: English
Additional information: This version is the author accepted manuscript. The final publication is available on https://link.springer.com/chapter/10.1007%2F978-94-024-1093-8_3. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Terahertz spectroscopy, Metamaterials, Carbon fibre, Near field
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10042692
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