Mitrofanov, O;
Wang, C-F;
Habteyes, T;
Luk, TS;
Klem, J;
Brener, I;
Chen, H-T;
(2020)
Near-field probing of strong light-matter coupling in single IR antennae.
In: Razeghi, M and Baranov, AN, (eds.)
Terahertz Emitters, Receivers, and Applications XI.
SPIE: California, USA.
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Abstract
Quantum well intersubband polaritons are traditionally studied in large scale systems, over many wavelengths in size. In this presentation, we demonstrate that it is possible to detect and investigate intersubband polaritons in a single subwavelength nanoantenna in the IR frequency range. We observe polariton formation using a scattering-type near-field microscope and nano-FTIR spectroscopy. We will discuss near-field spectroscopic signatures of plasmonic antennae with and without coupling to the intersubband transition in quantum wells located underneath the antenna. Evanescent field amplitude spectra recorded on the antenna surface show a mode anti-crossing behavior in the strong coupling case. We also observe a corresponding strong-coupling signature in the phase of the detected field. We anticipate that this near-field approach will enable explorations of strong and ultrastrong light-matter coupling in the single nanoantenna regime, including investigations of the elusive effect of ISB polariton condensation.
| Type: | Proceedings paper |
|---|---|
| Title: | Near-field probing of strong light-matter coupling in single IR antennae |
| Event: | SPIE Optical Engineering + Applications, 2020 |
| Location: | California, USA |
| Dates: | 24 August 2020 - 04 September 2020 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1117/12.2568033 |
| Publisher version: | https://doi.org/10.1117/12.2568033 |
| 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. |
| 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/10108926 |
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