Perovskite quantum dot one-dimensional topological laser

Jingyi Tian (), Qi Ying Tan, Yutao Wang, Yihao Yang, Guanghui Yuan, Giorgio Adamo and Cesare Soci ()
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Jingyi Tian: Nanyang Technological University
Qi Ying Tan: Nanyang Technological University
Yutao Wang: Nanyang Technological University
Yihao Yang: Nanyang Technological University
Guanghui Yuan: Nanyang Technological University
Giorgio Adamo: Nanyang Technological University
Cesare Soci: Nanyang Technological University

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract Various topological laser concepts have recently enabled the demonstration of robust light-emitting devices that are immune to structural deformations and tolerant to fabrication imperfections. Current realizations of photonic cavities with topological boundaries are often limited by outcoupling issues or poor directionality and require complex design and fabrication that hinder operation at small wavelengths. Here we propose a topological cavity design based on interface states between two one-dimensional photonic crystals with distinct Zak phases. Using a few monolayers of solution-processed all-inorganic cesium lead halide perovskite quantum dots as the ultrathin gain medium, we demonstrate a lithography-free, vertical-emitting, low-threshold, and single-mode laser emitting in the green. We show that the topological laser, akin to vertical-cavity surface-emitting lasers (VCSELs), is robust against local perturbations of the multilayer structure. We argue that the design simplicity and reduction of the gain medium thickness enabled by the topological cavity make this architecture suitable for low-cost and efficient quantum dot vertical emitting lasers operating across the visible spectral region.

Date: 2023
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DOI: 10.1038/s41467-023-36963-6

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