Fig. 6
From: Ultrafast modulation of valley dynamics in multiple WS2 − Ag gratings strong coupling system
Valley modulation of the WS2-spiral Ag grating device. a Schematic diagram of WS2-spiral Ag grating device. b The CD spectra of clockwise spiral Ag grating, circular Ag grating and flat Ag film. c, d The near-field intensity of clockwise spiral Ag grating with 400 nm period at x − y plane for σ + and σ- excitation at 617 nm. e Valley modulation schematics of the WS2-spiral Ag grating strong coupling device