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Spectroscopy and mapping of resonant fields in terahertz plasmonic resonators

Mitrofanov, O; Han, Z; Ding, F; Bozhevolnyi, SI; Brener, I; Reno, JL; (2017) Spectroscopy and mapping of resonant fields in terahertz plasmonic resonators. In: Razeghi, M, (ed.) Quantum Sensing and Nano Electronics and Photonics XIV. (pp. 101110R1-101110R7). SPIE Green open access

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Abstract

Plasmonic terahertz (THz) resonators provide a promising route for exploring strong light-matter coupling phenomena. Double-metal resonator designs in particular enable strong enhancement of the THz field and provide well-defined field orientation and confinement within a sub-wavelength size volume. The strong field confinement however limits access to the internal fields essential for investigations of light-matter coupling. We propose and investigate a method for mapping and spectroscopic analysis of the internal fields in double-metal plasmonic THz resonators. We use aperture-type scanning near-field THz microscopy to access strongly confined fields with sub-wavelength spatial resolution of ~5 μm (~λ/100). Combined with the THz time-domain spectroscopy technique, the near-field method allows us to perform spectroscopic studies and investigate the field evolution inside the resonator. This experimental method opens doors to studies of strong light-matter coupling at THz frequencies in individual plasmonic resonators.

Type: Proceedings paper
Title: Spectroscopy and mapping of resonant fields in terahertz plasmonic resonators
Event: SPIE OPTO 2017: Conference on Quantum Sensing and Nano Electronics and Photonics XIV, 28 January - 2 February 2017, San Francisco, California, United States
Location: San Francisco, CA
Dates: 29 January 2017 - 02 February 2017
ISBN-13: 9781510606630
Open access status: An open access version is available from UCL Discovery
DOI: 10.1117/12.2254416
Publisher version: http://dx.doi.org/10.1117/12.2254416
Language: English
Additional information: This is the published version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: terahertz, near-field microscopy, terahertz time-domain spectroscopy, plasmons, resonators, light-matter coupling, metamaterials
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/1573058
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