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 TiO2 dielectric nanoantenna. The observed three- to five-fold emission enhancement is attributed to near-field effects and emission steering promoted by the coupling between the perovskite nanocrystals and the dielectric sub-micrometric antennas. The dark-field scattering 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 method can be easily extended to electronic transitions in other spectral regions, paving the way for absorption nanoscopy of many different quantum emitters from organic molecules to quantum dots.

Light Emitting Si‐Based Mie Resonators: Toward a Huygens Source of Quantum Emitters

“…In the case of perovskite nanocrystals coupled to TiO 2 ‐based Mie resonators, the PL enhancement reached a value of five with respect to bare emitters. [ 54 ] This enhancement is not far from what was previously reported by dispersing colloidal quantum dots atop Si‐based Mie resonators. [ 7 ] This latter analysis clearly points out the importance of embedding the emitters within the resonant cavities when targeting a large brightness of the sources (e.g., as for quantum optics applications).…”

Strong Purcell enhancement at telecom wavelengths afforded by spinel Fe3O4 nanocrystals with size-tunable plasmonic properties

“…For similar systems, enhancement ranged from 2.7 to 24. [14][15][16][17][18] Here, we replace metal NCs with Fe 3 O 4 NCs and CdSe QDs with PbS/CdS QDs (Fig. 5(a)).…”

“…Finally, the Fe 3 O 4 sp-MO NCs are assembled into hybrid layered structures with infrared-emitting colloidal QDs to quantify distance-dependent Purcell enhancement, which has previously only been documented for coupled metallic NC and emitter couples active in the visible spectral range. [14][15][16][17][18]…”

Enhanced Spontaneous Emission of CsPbI3 Perovskite Nanocrystals Using a Hyperbolic Metamaterial Modified by Dielectric Nanoantenna

“…The TiO 2 nanoresonators of such a size present a fundamental MIE resonance at around 700 nm [ 33 ], which is close to the emission wavelength of our PNCs. In these conditions, the TiO 2 nanoantennas are able to scatter the emitted light from PNCs towards the normal direction to the HMM plane and with it, to further improve the exciton radiative rate [ 32 ].…”

“…In the simulations, the permittivity of lithium fluoride (LiF) was taken to be ε LiF = 1.95, whereas those of silver (Ag), silicon (Si), and TiO 2 spheres were taken from Refs. [ 30 , 31 , 32 ].…”