Highly photo-stable Perovskite nanocubes: towards integrated single photon sources based on tapered nanofibers

TL;DR

This paper demonstrates highly photo-stable perovskite nanocubes as efficient single photon emitters with reduced blinking and strong antibunching, and successfully couples them to tapered nanofibers for integrated quantum photonic applications.

Contribution

It introduces a synthesis method that enhances nanocube photostability and reports the first coupling of a single nanocube with a tapered nanofiber for integrated photon sources.

Findings

Enhanced photostability of perovskite nanocubes under optical excitation.

Reduced blinking and strong photon antibunching observed.

Successful coupling of nanocubes with tapered nanofibers achieved.

Abstract

The interest in perovskite nanocrystals (NCs) such as CsPbBr$_3$ for quantum applications is rapidly raising, as it has been demonstrated that they can behave as very efficient single photon emitters. The main problem to tackle in this context is their photo-stability under optical excitation. In this article, we present a full analysis of the optical and quantum properties of highly efficient perovskite nanocubes synthesized with an established method, which is used for the first time to produce quantum emitters, and is shown to ensure an increased photostability. These emitters exhibit reduced blinking together with a strong photon antibunching. Remarkably these features are hardly affected by the increase of the excitation intensity well above the emission saturation levels. Finally, we achieve for the first time the coupling of a single perovskite nanocube with a tapered optical nanofiber in order to aim for a compact integrated single photon source for future applications.