Fig. 4: Tunable coupling in a photonic lattice. | Nature Communications

Fig. 4: Tunable coupling in a photonic lattice.

From: Tunable exciton-polaritons emerging from WS2 monolayer excitons in a photonic lattice at room temperature

Fig. 4

a Momentum-resolved photoluminescence spectrum of a polariton chain with D/A = 1.7 for two different DBR separations of 2.184 and 2.192 µm in the regions of k|| < 0 (I, left) and k|| > 0 (II, right), respectively. The map intensity is coded in a false colour scale included in the right side of the map. Each spectrum is recorded with a pump power of ~ 100 µW and 480 s integration time. b, c Dependence of the s-band energy (magenta circles) and the p-band bandwidth (for Bloch modes 1 (BM1) and 3 (BM3), presenting an energy difference of 7 meV) versus cavity length. The labels (I, II) mark the corresponding Es and ΔEp values of panels in (a). The error bars in (c, d) represent the accuracy in the energy determination.

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