Enhanced nanoscopy of individual CsPbBr3 perovskite nanocrystals using dielectric sub-micrometric antennas

Abstract

We demonstrate an efficient, simple, and low-cost approach for enhanced nanoscopy in individual green emitting perovskite (CsPbBr3)nanocrystals via TiO2dielectric nanoantenna. The observed three- to five-fold emission enhancement is attributed to near-field effects andemission steering promoted by the coupling between the perovskite nanocrystals and the dielectric sub-micrometric antennas. The dark-fieldscattering configuration is then exploited for surface-enhanced absorption measurements, showing a large increase in detection sensitivity,leading to the detection of individual nanocrystals. Due to the broadband spectral response of the Mie sub-micrometric antennas, the methodcan be easily extended to electronic transitions in other spectral regions, paving the way for absorption nanoscopy of many different quantumemitters from organic molecules to quantum dots.