Fig. 2: Input-output characteristic of quasi-2D HaP polariton device.
From: Room-temperature polariton condensate in a quasi-2D hybrid perovskite
a Power-dependent polariton emission spectra as a function of excitation pulse energy (525 nm central wavelength, 140 fs pulse duration, 80 MHz repetition rate). Spectra are vertically offset for better visibility. Excitation powers are indicated on the left in multiples of lasing threshold. Inset: Electron micrograph of the upper cavity distributed Bragg reflector (DBR) shaped into a (100 µm)3 mesa to allow short cavity distances. Sphere cap-shaped indentations (6 µm diameter, 150 nm depth) result in three-dimensionally confined, discrete Laguerre-Gaussian type optical modes that we couple to the halide perovskite (HaP) flake. b Double logarithmic plot of the input-output curve extracted from the areas under Voigt fits to the spectra in a. Inset: Linear representation of the same data as in the main panel. From linear fits (dashed red) we extract a polariton lasing threshold of \(0.41\, {{\mu}{{\rm{Jcm}}}^{-2}}\) per pulse. c Spectral position of the Voigt fit as a function of pulse energy relative to the first data point. The emission undergoes a blueshift continuing beyond the lasing threshold. d Spectral linewidth extracted from the Voigt fits as a function of pulse energy. Error bars in b-d correspond to 95% confidence intervals of the fit.
