Room-temperature Distributed Feedback CsPbBr$_3$ Perovskite Laser Integrated on a Silicon Nitride Waveguide Platform

TL;DR

This paper reports the first room-temperature distributed feedback CsPbBr3 perovskite laser integrated on a silicon nitride platform, demonstrating low-threshold lasing in the green spectral region suitable for photonic integrated circuits.

Contribution

It introduces a monolithically integrated, room-temperature DFB CsPbBr3 perovskite laser on a silicon nitride platform, advancing on-chip green laser technology.

Findings

Achieved room-temperature lasing at 540 nm in CsPbBr3 perovskite.

Demonstrated low ASE threshold of 14.5 μJcm$^{-2}$.

Lasing threshold of 0.755 mJcm$^{-2}$ at room temperature.

Abstract

Silicon photonic integrated circuits (PICs) require cost-effective laser sources that can be monolithically integrated. The low cost and low-temperature solution processability of metal halide perovskites (MHPs) make them attractive alternatives to established III-V compound semiconductors for on-chip laser sources in PICs. Cesium lead bromide (CsPbBr$_3$) perovskites are emerging materials for green light-emitting diodes and lasers. To date, amplified spontaneous emission (ASE) at room temperature has been frequently achieved in CsPbBr$_3$ thin films, while reports on lasing are more limited. Here, we demonstrate a first-order grating distributed feedback (DFB) CsPbBr$_3$ thin-film laser operating at room temperature. Planar hot-pressed (PHP)-CsPbBr$_}$, with a low ASE threshold of 14.5 $\mu$Jcm$^{-2}$ under 0.3 nanosecond (ns) pump pulses, was monolithically integrated into a silicon nitride (Si$_3$N$_4$) waveguide platform via a compatible top-down patterning process. The first-order grating DFB PHP-CsPbBr$_3$ thin-film laser operated at 540 nm in the green spectral region, where III-V lasers have limitations, and exhibited a lasing threshold of 0.755 mJcm$^{-2}$ at room temperature. This work marks a significant step toward utilizing MHPs for on-chip green lasers in PICs for commercial applications.