# Near-field collection of fluorescence of quantum dots with a fiber-integrated multimode plasmonic probe

## TL;DR

This paper introduces a fiber-integrated multimode silver nanowire probe for near-field collection of quantum dot fluorescence, achieving near-unity efficiency and advancing quantum nanophotonics applications.

## Contribution

A novel fiber-integrated plasmonic probe for efficient near-field fluorescence collection from quantum dots is proposed and experimentally validated.

## Key findings

- Near-unity collection efficiency theoretically achieved.
- Enhanced coupling between quantum dots and plasmonic modes demonstrated.
- Potential applications in quantum information devices suggested.

## Abstract

Strong light-matter interaction and high-efficiency optical collection of fluorescence from quantum emitters are crucial topics in quantum and nanophotonic fields. High-quality cavities, dispersive photonic crystal waveguides and even plasmonic structures have been used to enhance the interaction with quantum emitters, thus realize efficient collection of the fluorescence. In this work, a new method is proposed to collect the fluorescence of quantum dots (QDs) with a fiber-integrated multimode silver nanowire (AgNW) waveguide. Fluorescence lifetime measurement is performed to investigate the coupling between QDs and different plasmonic modes. Compared with far-field collection method, the AgNW-fiber probe can realize near-unity collection efficiency theoretically. This fiber-integrated plasmonic probe may be useful in the area of nanophotonics and also promising for quantum information devices.