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

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 spectrosco...

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Vydáno v:Nature communications Ročník 14; číslo 1; s. 4098 - 7
Hlavní autoři: Bergeron, Alaric, Gradziel, Clément, Leonelli, Richard, Francoeur, Sébastien
Médium: Journal Article
Jazyk:angličtina
Vydáno: London Nature Publishing Group UK 11.07.2023
Nature Publishing Group
Nature Portfolio
Témata:
639/301/930/527/1821
639/624/400/2797
639/766/119/1000/1018
639/766/119/995
Anisotropy
Backscattering
Configurations
Confinement
Crystals
Dispersion
Excitation
Excitons
Humanities and Social Sciences
Incidence angle
multidisciplinary
Optical density
Phonons
Polaritons
Propagation
Raman spectra
Raman spectroscopy
Science
Science (multidisciplinary)
Spectroscopy
Spectrum analysis
Two dimensional materials
ISSN:2041-1723, 2041-1723
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Popis
Shrnutí: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. Hyperbolic phonon polaritons (HPhPs) in anisotropic van der Waals materials hold promise for nanophotonic applications, but their far-field characterization remains challenging. Here, the authors demonstrate the application of Raman spectroscopy in a backscattering configuration to determine the dispersion of HPhPs in thin GaSe crystals.
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ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-023-39809-3