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Probing hyperbolic and surface phonon-polaritons in 2D materials using Raman spectroscopy

Alaric Bergeron, Clément Gradziel, Richard Leonelli and Sébastien Francoeur

Article (2023)

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Abstract

The hyperbolic dispersion relation of phonon-polaritons (PhPols) in anisotropic van der Waals materials provides high-momentum states, directional propagation, subdiffractional confinement, large optical density of states, and enhanced light-matter interactions. In this work, we use Raman spectroscopy in the convenient backscattering configuration to probe PhPol in GaSe, a 2D material presenting two hyperbolic regions separated by a double reststrahlen band. By varying the incidence angle, dispersion relations are revealed for samples with thicknesses between 200 and 750 nm. Raman spectra simulations confirm the observation of one surface and two extraordinary guided polaritons and match the evolution of PhPol frequency as a function of vertical confinement. GaSe appears to provide relatively low propagation losses and supports confinement factors matching or exceeding those reported for other 2D materials. Resonant excitation close to the 1s exciton singularly exalts the scattering efficiency of PhPols, providing enhanced scattering signals and means to probe the coupling of PhPols to other solid-state excitations.

Uncontrolled Keywords

electronic properties and materials; polaritons; raman spectroscopy; two-dimensional materials

Subjects: 3100 Physics > 3100 Physics
Department: Department of Engineering Physics
Funders: CRSNG/NSERC, Photonique Quantique Québec, Canada Foundation for Innovation, Fonds de Recherche du Québec - Nature et Technologies (FRQNT)
Grant number: RGPIN-2017-06284, RGPIN2023-04675
PolyPublie URL: https://publications.polymtl.ca/55993/
Journal Title: Nature Communications (vol. 14, no. 1)
Publisher: Nature Portfolio
DOI: 10.1038/s41467-023-39809-3
Official URL: https://doi.org/10.1038/s41467-023-39809-3
Date Deposited: 23 Jan 2024 12:57
Last Modified: 25 May 2024 12:25
Cite in APA 7: Bergeron, A., Gradziel, C., Leonelli, R., & Francoeur, S. (2023). Probing hyperbolic and surface phonon-polaritons in 2D materials using Raman spectroscopy. Nature Communications, 14(1), 4098 (7 pages). https://doi.org/10.1038/s41467-023-39809-3

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