Dimension-programmable CsPbBr₃nanowires for plasmonic lasing with PDMS templated technique

Lead halide perovskites have superior gain properties, and they can be mass produced into nanowire structures through chemical synthesis. The application of perovskite materials into plasmonic nanowire lasers lowers the lasing threshold and simplifies the fabrication process. However, in nearly all previous reported cases, perovskite nanowires were randomly distributed onto metallic substrate when using the method of dry-transferring or direct chemical vapor deposition. As a result, the dimensions of perovskite nanowires are random and undesired photonic mode lasing may take place instead. Here we present a method for preparing polydimethylsiloxane templated CsPbBr3 nanowires upon Au substrate in controllable dimensions with height below cutoff size, therefore advantageous for plasmonic nanowire laser applications. Additionally, low threshold plasmonic lasing is observed in ridge structure CsPbBr3 nanowire waveguide with a total height of merely 160 nm on Au substrate. A faster radiative decay rate than its photonic counterpart is evident, as well as a dominant polarization parallel to the nanowire axial solidify plasmonic lasing. This work paves the way for mass production of perovskite plasmonic nanolasers.