Fig. 2: Photoluminescence enhancement and Purcell effect in WS2 monolayers coupled to GaP nanoantennas.
From: Radiative suppression of exciton–exciton annihilation in a two-dimensional semiconductor
a Map of WS2 monolayer PL on top of an array of resonant GaP nanoantennas. b PL signal of the WS2 on top of a GaP resonant nanoantennas with different radii (in red), and on top of the bare SiO2 substrate (in blue). The dashed line marks the unstrained exciton energy. Inset: experimental PL enhancement factor, \(\left\langle {\rm{EF}}\right\rangle\), extracted from the integrated PL intensity. c Time-resolved PL traces from a WS2 monolayer coupled to a GaP nanoantenna with r = 90 nm (in red) and on the glass substrate (in blue), revealing a twofold reduction of the exciton decay dynamics ascribed to the Purcell effect. The data is fitted with a single exponential decay with offset (solid lines)
