Ultracompact\nand Uniform Nanoemitter Array Based on\nPeriodic Scattering

As emerging gain materials, lead halide perovskites have\ndrawn\nconsiderable attention in coherent light sources. With the development\nof patterning and integration techniques, a perovskite laser array\nhas been realized by distributing perovskite microcrystals periodically.\nNevertheless, the packing density is limited by the crystal size and\nthe channel gap distance. More importantly, the lasing performance\nfor individual laser units is quite random due to variation of size\nand crystal quality. Herein an ultracompact perovskite nanoemitter\narray with uniform emission has been demonstrated. Individual emitters\nare formed via scattering evanescent components from a shared Fabry–Perot\nlaser, ensuring uniform lasing emission in a unit cell with a side\nlength of 160 nm and lattice constant of 400 nm. And the periodic\nsilicon scatterers do not deteriorate the lasing threshold dramatically.\nIn addition, the surface emitting efficiency increased significantly.\nThe direct integration of a densely packed nanoemitter array with\na silicon platform promises high-throughput sensing and high-capacity\noptical interconnects.