Dispersion of the nonlinear susceptibility of MoS2 and WS2 from second-harmonic scattering spectroscopy

Kévin Bredillet (1) , Jérémy Riporto (1) , Gregory T Forcherio , Jeremy R Dunklin , Jean-Pierre Wolf , Luigi Bonacina , Yannick Mugnier (1) , Ronan Le Dantec (1)

1 SYMME - Laboratoire SYstèmes et Matériaux pour la MEcatronique

Dispersion of the absolute second-order susceptibility of both MoS2 and WS2 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.

Domaines: Optique [physics.optics]; Optique / photonique

Kévin Bredillet, Jérémy Riporto, Gregory T Forcherio, Jeremy R Dunklin, Jean-Pierre Wolf, et al.. Dispersion of the nonlinear susceptibility of MoS2 and WS2 from second-harmonic scattering spectroscopy. Physical Review B, 2020, 102 (23), pp.235408. ⟨10.1103/PhysRevB.102.235408⟩. ⟨hal-03045815⟩