Optical seminar | 15 January 2021

Halide perovskites are known to be a very prospective class material for all-dielectric resonant nanophotonics due to their unique optical properties which make them perfect candidates for effective nanoscale light sources. 

In this talk, I will show how to employ halide perovskites to create light-emitting nanoantennas by laser printing method with enhanced photoluminescence, will report the first observation of a Fano resonance in halide perovskite MAPbBr3 nanoparticles originating from coupling of exciton resonance to their Mie resonances, and will demonstrate results where that monolithic dielectric nanoparticles made of CsPbBr3 halide perovskites grown by the simple chemical method can exhibit efficient Mie-resonant lasing in visible frequency ranges.

Plasmonic nanosponges are apowerful platform for various nanophotonic applications owing to extremely highlocal field enhancement in metallic nanopores. The filling of the nanoporeswith high-refractive index semiconductors (e.g. Si, Ge, GaP, etc.)opens up opportunities for the enhancement of nonlinear effects in thesematerials. However, this task remains challenging due to the lack of knowledgeon the integration process of metal and high-index semiconductor components insuch nanoobjects. Here, we investigate metal-dielectric nanoparticlesfabricated from bilayer Si/Au films by the laser printing technique via acombination of theoretical and experimental methods. We reveal that thesehybrid nanoparticles represent the Au sponge-like nanostructure filled with Sinanocrystallites. We also demonstrate that the Au net provides strongnear-field enhancement in the Si grains increasing the white lightphotoluminescence in the hybrid nanostructures compared to uniform Sinanoparticles. These results pave the way for engineering the internalstructure of the sponge-like hybrid nanoparticles possessing white lightluminescence and control of their optical properties on demand.