Fig. 8
From: Ultrafast modulation of valley dynamics in multiple WS2 − Ag gratings strong coupling system
Circular polarized TA spectra of WS2-spiral Ag grating devices. a, b Circular polarized TA spectra of WS2-spiral Ag grating devices with a 400 nm period at different delay times (0.34 ps, 1.5 ps, 10 ps, 30 ps) under the σ + (a) and σ- (b) excitation. c The σ + σ + and σ-σ- TA spectra at different delay times are extracted and compared. The excitation wavelength is 560 nm