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Observation of Intersubband Polaritons in a Single Nanoantenna Using Nano-FTIR Spectroscopy

Mitrofanov, O; (2019) Observation of Intersubband Polaritons in a Single Nanoantenna Using Nano-FTIR Spectroscopy. Nano Letters , 19 (7) pp. 4620-4626. 10.1021/acs.nanolett.9b01623. Green open access

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Abstract

Strong coupling of an intersubband (ISB) electron transition in quantum wells to a subwavelength plasmonic nanoantenna can give rise to intriguing quantum phenomena, such as ISB polariton condensation, and enable practical devices including low threshold lasers. However, experimental observation of ISB polaritons in an isolated subwavelength system has not yet been reported. Here, we use scanning probe near-field microscopy and Fourier-transform infrared (FTIR) spectroscopy to detect formation of ISB polariton states in a single nanoantenna. We excite the nanoantenna by a broadband IR pulse and spectrally analyze evanescent fields on the nanoantenna surface. We observe the distinctive splitting of the nanoantenna resonance peak into two polariton modes and two π-phase steps corresponding to each of the modes. We map ISB polariton dispersion using a set of nanoantennae of different sizes. This nano-FTIR spectroscopy approach opens doors for investigations of ISB polariton physics in the single subwavelength nanoantenna regime.

Type: Article
Title: Observation of Intersubband Polaritons in a Single Nanoantenna Using Nano-FTIR Spectroscopy
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/acs.nanolett.9b01623
Publisher version: https://doi.org/10.1021/acs.nanolett.9b01623
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Intersubband polariton, near-field microscopy, quantum well, nanoantenna, nano-FTIR
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/10075995
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