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Dipolar resonances in conductive carbon micro-fibers probed by near-field terahertz spectroscopy

Khromova, I; Navarro-Cia, M; Brener, I; Reno, JL; Ponomarev, A; Mitrofanov, O; (2015) Dipolar resonances in conductive carbon micro-fibers probed by near-field terahertz spectroscopy. APPLIED PHYSICS LETTERS , 107 (2) 10.1063/1.4926628. Green open access

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Abstract

We observe dipole resonances in thin conductive carbon micro-fibers by detecting an enhanced electric field in the near-field of a single fiber at terahertz (THz) frequencies. Time-domain analysis of the electric field shows that each fiber sustains resonant current oscillations at the frequency defined by the fiber's length. Strong dependence of the observed resonance frequency and degree of field enhancement on the fibers' conductive properties enable direct non-contact probing of the THz conductivity in single carbon micro-fibers. We find the conductivity of the fibers to be within the range of 1– 5×104 S/m. This approach is suitable for experimental characterization of individual doped semiconductor resonators for THz metamaterials and devices.

Type: Article
Title: Dipolar resonances in conductive carbon micro-fibers probed by near-field terahertz spectroscopy
Open access status: An open access version is available from UCL Discovery
DOI: 10.1063/1.4926628
Publisher version: http://dx.doi.org/10.1063/1.4926628
Language: English
UCL classification: UCL
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/1470575
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