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Fig. 4 | PhotoniX

Fig. 4

From: Ultrafast modulation of valley dynamics in multiple WS2 − Ag gratings strong coupling system

Fig. 4

Comparison of energy valley dynamics between monolayer WS2 and WS2-linear Ag grating device. a Circular polarization TA spectra of monolayer WS2 at 0.3 ps under σ + (solid line) and σ- (dotted line) excitation. b Valley dynamics of monolayer WS2 probed at 617.0 nm. c The dynamics of the circular polarization degree of monolayer WS2 at 617.0 nm under σ + and σ- excitation. The insert diagram describes the valley band transition in TMDC. d Circular polarization TA spectra of WS2-linear Ag grating device with the period of 425 nm at 0.3 ps. e Valley dynamics of WS2-linear grating device probed at 613.6 nm. f The dynamics of the circular polarization degree of the WS2-linear Ag grating device at 613.6 nm. The excitation wavelength is 560 nm

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