Controllable Spin-Resolved Photon Emission Enhanced by Slow-Light Mode in Photonic Crystal Waveguides on Chip

TL;DR

This paper demonstrates controllable, spin-resolved photon emission from a quantum dot in a photonic crystal waveguide, enhanced by slow-light effects, with potential applications in integrated quantum photonics.

Contribution

It introduces a method to enhance and control spin-resolved photon emission using slow-light modes in photonic crystal waveguides on chip.

Findings

Achieved circular polarization degree up to 0.81.

Demonstrated spin-dependent emission enhancement via slow-light modes.

Showed potential for on-chip quantum network applications.

Abstract

We report the slow-light enhanced spin-resolved in-plane emission from a single quantum dot (QD) in a photonic crystal waveguide (PCW). The slow light dispersions in PCWs are designed to match the emission wavelengths of single QDs. The resonance between two spin states emitted from a single QD and a slow light mode of a waveguide is investigated under a magnetic field with Faraday configuration. Two spin states of a single QD experience different degrees of enhancement as their emission wavelengths are shifted by combining diamagnetic and Zeeman effects with an optical excitation power control. A circular polarization degree up to 0.81 is achieved by changing the off-resonant excitation power. Strongly polarized photon emission enhanced by a slow light mode shows great potential to attain controllable spin-resolved photon sources for integrated optical quantum networks on chip.