Near-field probing of strong light-matter coupling in single IR antennae

Journal Article · 20 August 2020 · Proceedings of SPIE - The International Society for Optical Engineering

DOI: https://doi.org/10.1117/12.2568033 · OSTI ID:1650163

Mitrofanov, Oleg ^[1]; Wang, Chih-Feng ^[2]; Habteyes, Terefe G. ^[3]; Luk, Ting Shan ^[4]; Klem, John F. ^[5]; Brener, Igal ^[4]; Chen, Hou-Tong  ^[6]

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1. University College, London (United Kingdom); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies
2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States; Univ. of New Mexico, Albuquerque, NM (United States). Center for High Technology Materials (CHTM); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
3. Univ. of New Mexico, Albuquerque, NM (United States). Center for High Technology Materials (CHTM)
4. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies
5. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Quantum well intersubband polaritons are traditionally studied in large scale ensembles, over many wavelengths in size.In this presentation, we demonstrate that it is possible to detect and investigate intersubband polaritons in a single sub-wavelength nanoantenna in the IR frequency range. We observe polariton formation using a scattering-type near-fieldmicroscope and nano-FTIR spectroscopy. In this work, we will discuss near-field spectroscopic signatures of plasmonic antennae withand without coupling to the intersubband transition in quantum wells located underneath the antenna. Evanescent fieldamplitude spectra recorded on the antenna surface show a mode anti-crossing behavior in the strong coupling case. Wealso observe a corresponding strong-coupling signature in the phase of the detected field. We anticipate that this near-fieldapproach 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.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
• Grant/Contract Number: AC04-94AL85000; NA0003525; 89233218CNA000001; 1651478
• OSTI ID: 1650163
• Alternate ID(s): OSTI ID: 1897438
• Report Number(s): SAND-2020-8384J; LA-UR-22-24801; 689916
• Journal Information: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 11499; Conference: SPIE Optical Engineering + Applications, Held Virtually (United States), 24 Aug-04 Sep 2020; ISSN 0277-786X
• Publisher: SPIECopyright Statement
• Country of Publication: United States
• Language: English