Fig. 5From: Ultrafast modulation of valley dynamics in multiple WS2 − Ag gratings strong coupling systemCircular polarization TA spectra of WS2-circular Ag grating device. a Schematic diagram of WS2-circular Ag gratings device. b, c Circular polarization TA spectra of the WS2-circular Ag gratings devices under the σ + (b) and σ- (c) excitation. d The dynamics of the circular polarization degree at WS2-circular Ag gratings under σ + and σ- excitationBack to article page