Vertical Green Lasing via Brillouin Zone Folded Guided Resonance in Quasi-2D Perovskite

Lead halide perovskites (LHPs) are promising gain materials for use in the green-gap spectral region. However, in this wavelength range, the breadth of photonic designs is limited due to the smaller critical dimensions and the requirement to integrate LHP deposition and growth methods. Here, we utilize a Brillouin zone folding (BZF) design which relies on the spatial positioning of elements in the unit cell, rather than precise shape and fill factor modulation to tune the mode coupling to the light cone. In this example, a BZF-guided resonance is utilized as the lasing mode to demonstrate vertical surface emission lasing from a quasi-2D LHP. The lowest lasing threshold fluence is approximately 200 μJ cm–2 under pumping with a 5 ns pulse width 355 nm wavelength laser. This work presents a method of designing and constructing a nanoscale laser for surface emission lasing in the green spectral region.