Highly Efficient Coupling of Nanolight Emitters to a Ultra-wide Tunable Nanofibre Cavity

TL;DR

This paper presents a nanofibre Bragg cavity with ultra-small mode volume and wide-range tunability, enabling efficient coupling to quantum dots and potential applications in nanophotonics and quantum networks.

Contribution

The authors developed an integrated nanofibre cavity with tunable resonance and lossless fiber coupling, demonstrating enhanced quantum dot emission.

Findings

Mode volume under 1 cubic micrometer

Tunable over 20 nm at visible wavelengths

Emission enhancement factor of 2.7

Abstract

Solid-state microcavities combining ultra-small mode volume, wide-range resonance frequency tuning, as well as lossless coupling to a single mode fibre are integral tools for nanophotonics and quantum networks. We developed an integrated system providing all of these three indispensable properties. It consists of a nanofibre Bragg cavity (NFBC) with the mode volume of under 1 micro cubic meter and repeatable tuning capability over more than 20 nm at visible wavelengths. In order to demonstrate quantum light-matter interaction, we establish coupling of quantum dots to our tunable NFBC and achieve an emission enhancement by a factor of 2.7.