Fig. 7
From: Ultrafast modulation of valley dynamics in multiple WS2 − Ag gratings strong coupling system
Valley-polarized PL spectra of monolayer WS2 and WS2-spiral Ag grating devices at room temperature. a Circularly polarized PL spectra of monolayer WS2 on SiO2/Si substrate under σ + excitation. The value of the PL circular polarizability is almost 0. b, c Circularly polarized PL spectra of WS2-spiral Ag gratings device under the of σ + (b) and σ- (c) excitation. The PL circular polarizability are Pσ+ = 14.9% and Pσ- = 10.8%, respectively. The devices were excited by a 532 nm continuous-wave solid-state laser