Fig. 4: Tunable strong coupling via electrostatic gating.
From: Electrically tunable strong coupling in a hybrid-2D excitonic metasurface for optical modulation
a Normal-incidence TE-polarized reflectance as function of gate voltage (color). The spectra measured at VG = 0 V, ±25 V are omitted for clarity. b Spectral reflectance versus nonradiative decay rate of excitons in monolayer WS2, simulated with the RCWA model for ħγA,r = 2.7 meV and EA = 2 eV. The colored datapoints represent the fitted energies, relative amplitudes (position and size of hexagons, respectively), and linewidths (width of bars) of the coupled modes. c Exciton nonradiative decay rate as a function of gate voltage (electron density) obtained from the RCWA fits (colored datapoints). Purple curve indicates the fitted optical rate equation, pink-shaded region represents the decay rates at which the system is strongly coupled. The coupling rates ħg obtained from the CMT analysis are shown in the inset (fitting uncertainty in green)
