Experimental study of perovskite nanocrystals as single photon sources for integrated quantum photonics

TL;DR

This paper investigates the optimization of perovskite nanocrystals as stable single-photon sources and demonstrates their coupling with photonic nanostructures for integrated quantum photonics applications.

Contribution

It provides a comprehensive characterization of improved perovskite nanocrystals and demonstrates their integration with nanofibers and waveguides for quantum photonics.

Findings

Enhanced photo-stability of perovskite nanocrystals

Successful coupling with nanofibers for single-photon emission

Use of ion exchange waveguides for emitter trapping

Abstract

This thesis is devoted to the study of the coupling of single-photon emitters with photonic nanostructures by using the properties of the near field of a photonic structure in view of the realization of a compact integrated single-photon source for quantum applications. The first part of my thesis work was consecrated to the optimization of perovskites nanocrystals. Although perovskites nanocrystals are very promising single-photon sources, they still need improvements: in this work, I review the main properties of these emitters and present a full characterization of perovskite nanocrystals with improved photo-stability, reduced blinking ad strong antibunching. In the second part of the thesis, I focus on the coupling of quantum emitters with various photonic structures: namely the tapered optical nanofibers and the ion-exchange waveguides. The fabrication method and the optical properties of the nanofibers are described in detail and the coupling of a single perovskite nanocrystal with a nanofiber is achieved, which constitutes a proof of principle of a hybrid integrated single-photon source. Finally, I show how the near field around ion exchange waveguides can be employed together with near-field polymerization to trap single-photon emitters onto the waveguides.