Perovskite Nanophotonic Devices and Topological Photonic Devices

Solution processed organic-inorganic lead halide perovskites have rapidly emerged as a promising gain material for development of the next generation of nanophotonic device ranging from nanolasers, nano LEDs, and solar cells. Here, continuous-wave operation of MAPbI3 perovskite nanolaser is achieved at room temperature with ultralow threshold, which is enabled by thermal nanoimprint lithography that directly patterns perovskite into laser cavities and improves perovskite’s emission characteristics. In the meantime, hyperbolic metamaterials and metasurfaces (HMMs), a special class of anisotropic media, has drawn tremendous research attention recently owing to its remarkable ability to manipulate electromagnetic waves at the subwavelength scale. However, the inevitable metal loss hinders the development of HMMs. Here, a luminescent perovskite HMM operating at 760 nm is achieved using alternating layers of MAPbI3 perovskite and Au, where the loss in Au is maximally compensated by MAPbI3. Simultaneously, topological photonics is a rapidly emerging field, aiming to apply topological physics in photonic systems. The topological protected photonic edge mode is immune to the system disorders and imperfections. However, all photonic edge modes reported in the pioneering works are from lattice systems. Here, a topological band theory is developed in continuous HMM through a nonHermitian Hamiltonian formulated Maxwell’s equations. Two types of edge mode can be induced by including gyromagnetic and chiral effect in HMM and can be numerically observed. Finally, a topological micro ring laser array that possesses edge mode lasing is designed and experimentally achieved on the III-V semiconductor platform.