Continuous‐Wave Lasing in Cesium Lead Bromide Perovskite Nanowires. Issue 2 (18th December 2017)

• Record Type: Journal Article
• Authors: Evans, Tyler J. S.; Schlaus, Andrew; Fu, Yongping; Zhong, Xinjue; Atallah, Timothy L.; Spencer, Michael S.; Brus, Louis E.; Jin, Song; Zhu, X.‐Y.
• Is Part Of: Advanced optical materials. Volume 6:Issue 2(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-12-18
• Subjects: continuous wave lasers -- lead halide perovskites -- nanowire lasers -- polaritons; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.201700982
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: Lead halide perovskite nanowires (NWs) have been demonstrated in pulsed lasing with high quantum yields, low thresholds, and broad tunability. However, continuous‐wave (CW) lasing, necessary for many optoelectronic applications, has not been achieved to date. This is thought to be due to many‐body screening, which reduces the excitonic resonance enhancement of the oscillator strength at high excitation densities necessary for population inversion. Here CW lasing in CsPbBr3 perovskite NWs is reported. Analysis of the cavity modes and their temperature dependence reveals that both CW and pulsed lasing originate from polariton modes near the bottleneck region on the lower polariton branch, with a vacuum Rabi splitting of 0.20 ± 0.03 eV. These findings suggest that lead halide perovskite NWs may serve as low‐power CW coherent light sources and as model systems for polaritonics in the strong‐coupling regime. Abstract : Optically pumped, continuous‐wave lasing in a CsPbBr3 nanowire is enabled by strong confinement‐enhanced light–matter coupling. Nanowire waveguide‐cavity photons are strongly coupled to the CsPbBr3 exciton resonance to give suboptical bandgap exciton–polariton states that undergo stimulated emission. The Rabi splitting is quantified by modeling the light leaking out at the end facets. This interaction leads to low‐threshold lasing and high effective Q‐factors.