Single-Crystalline Perovskite Microlasers for High-Contrast and Sub-Diffraction Imaging

Bottom-up synthesized single-crystalline micro- and nanolasers have been intensively studied in past decades. While the potential of single-crystalline lasers in integrated photonics has been seriously considered for years, their device performances are restricted by the scattering loss. Here, in contrast to the utilization of Q-factor or laser linewidth, the ultrasmooth surfaces of lead halide perovskite microplate lasers are exploited and their potential in subdiffraction limit imaging is explored for the first time. The nanostructures on the surface of the microplate can effectively scatter the evanescent waves and make the corresponding subwavelength spatial information detectable at far field. With the assistance of perovskite microlasers, a 41 nm nanogap and complex nanostructures are resolved with a conventional microscope. Meanwhile, more than 1000 determinants within the lasing are imaged simultaneously and the image contrast is further improved by the amplification of perovskite microlasers. This work shall revolutionize the applications of single-crystalline microlasers and subdiffraction limit imaging techniques.