Fig. 2: Lasing characterizations of a monocrystalline CsPbBr3 microwire.
From: Inorganic perovskite-based active multifunctional integrated photonic devices
a SEM image. Scale bar: 3 μm. PL microscope images below (b) the threshold (0.92 Pth) and above (c) the threshold (1.23 Pth), respectively. Scale bar: 3 μm. d FDTD simulation of the 2D normalized electric field intensity distribution along the microwire (λ = 538.63 nm, n = 2.53), defining a FP cavity standing-wave mode. e The PL spectra emitted from the microwire with the pump fluence increasing from 46 to 58 μJ cm−2. The inset shows one magnified lasing oscillation mode with a linewidth of 0.219 nm and a Q-factor of 2460 above the threshold (at 55 μJ cm−2). f The evolution of the integrated PL emission intensity (red curve) and linewidth (blue curve) as functions of pump fluence of the microwire, showing the threshold of 48.7 μJ cm-2. g ARPL (left) and PL (right) spectra of the microwire above the threshold (1.23 Pth). The patterns of the ARPL spectra originate from the interference of coherent lasing modes emitted from two edges of the such microwire.
