Dispersion of the nonlinear susceptibility of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">MoS</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">WS</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> from second-harmonic scattering spectroscopy
Kévin Bredillet, Jérémy Riporto, Gregory T. Forcherio, Jeremy R. Dunklin, Jean‐Pierre Wolf, Luigi Bonacina, Yannick Mugnier, Ronan Le Dantec
Abstract
Dispersion of the absolute second-order susceptibility of both $\mathrm{Mo}{\mathrm{S}}_{2}$ and $\mathrm{W}{\mathrm{S}}_{2}$ is assessed on a wide spectral excitation range (710--1300 nm) by using second-harmonic scattering spectroscopy (SHS). SHS is an accurate ensemble measurement here applied on well-dispersed suspensions of monodisperse liquid-exfoliated nanosheets showing a high monolayer content. The as-derived, high susceptibility values shed light on the discrepancies between available literature values while evidencing resonances associated with the main excitonic transitions.
Topics & Concepts
Dispersion (optics)SpectroscopyExcitationAnalytical Chemistry (journal)PhysicsHarmonicDispersion relationMaterials scienceCondensed matter physicsOpticsChemistryQuantum mechanicsChromatography2D Materials and ApplicationsPerovskite Materials and ApplicationsChalcogenide Semiconductor Thin Films