Lasing action from CsPbBr 3 perovskite microcrystals coupled to hyperbolic metamaterials

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Hyperbolic metamaterials (HMMs) are a unique type of anisotropic material. Its unbounded isofrequency surface allows for the large photonic density of states, which can enhance the spontaneous emission rate when the gain material is coupled to it. Recently, perovskite has rapidly emerged as a promising gain material for on-chip optical electronic devices, especially for nanolasers. In this work, we experimentally propose the CsPbBr 3 perovskite microcrystal coupled HMM, which consists of alternating layers of Au and Al 2 O 3 . By strategically designing the HMM’s plasmonic frequency consistent with the perovskite emission wavelength, lasing action is observed with a threshold at 20 μW/cm 2 . In comparison, when the same perovskite microcrystals are coupled to a regular silicon substrate, only spontaneous emission appears at a similar pump density. Benefiting from the spontaneous emission rate enhancement, the photon lifetime of the microcrystal coupled HMM substrate is 3.32 ns, which is almost 10 times smaller than that on SiO 2 and silicon substrate. Our work paves an avenue toward inserting HMM into the next generation of perovskite on-chip laser.