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Detection of internal fields in double-metal terahertz resonators

Mitrofanov, O; Han, Z; Ding, F; Bozhevolnyi, SI; Brener, I; Reno, JL; (2017) Detection of internal fields in double-metal terahertz resonators. Applied Physics Letters , 110 (6) , Article 061109. 10.1063/1.4975802. Green open access

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Abstract

Terahertz (THz) double-metal plasmonic resonators enable enhanced light-matter coupling by exploiting strong field confinement. The double-metal design however restricts access to the internal fields. We propose and demonstrate a method for spatial mapping and spectroscopic analysis of the internal electromagnetic fields in double-metal plasmonic resonators. We use the concept of image charges and aperture-type scanning near-field THz time-domain microscopy to probe the fields confined within the closed resonator. The experimental method opens doors to studies of light-matter coupling in deeply sub-wavelength volumes at THz frequencies.

Type: Article
Title: Detection of internal fields in double-metal terahertz resonators
Open access status: An open access version is available from UCL Discovery
DOI: 10.1063/1.4975802
Publisher version: http://dx.doi.org/10.1063/1.4975802
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Physics, Applied, Physics, MICROCAVITIES, PROBE, ANTENNAS, WAVES
UCL classification: UCL
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/1573056
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