Fig. 3: Widely tunable lattice polaritons.
a Momentum-resolved PL spectra of the 1D linear chain with a lens diameter of D = 5 µm and an overlap D/A = 1.7 for increasing DBR separations from left to right. The PL emission arises as a result of the coupling between the photonic lattice and the WS2 excitons. The pump power is ~ 227 µW and an integration time of 480 is used for each individual spectrum. The PL map intensities are coded in a false colour scale included on the right side of the panels. b Dependence of the s- (magenta circles) and p-band (violet squares) energy versus cavity length Lcav. The energy was tuned over 87.8 meV (s-band) 86.3 meV (p-band) with a change of the DBR separation by 135 nm. The error bars in (b) represent the accuracy in the energy determination.
