Purcell-Enhanced, Directional Light-Matter Interaction in a Waveguide-Coupled Nanocavity

• URL: http://arxiv.org/abs/2501.10351v1
• Date: Fri, 17 Jan 2025 18:47:00 GMT
• Title: Purcell-Enhanced, Directional Light-Matter Interaction in a Waveguide-Coupled Nanocavity
• Authors: Nicholas J. Martin, Dominic Hallett, Mateusz Duda, Luke Hallacy, Elena Callus, Luke Brunswick, René Dost, Edmund Clarke, Pallavi K. Patil, Pieter Kok, Maurice S. Skolnick, Luke R. Wilson,
• Abstract summary: We demonstrate electrically, spin-dependent, directional coupling of single photons by embedding quantum dots (QDs) in a waveguide-coupled nanocavity. The nanocavity enables wide-range electrical tuning of the emitter's directional contrast. In combination, these characteristics make this cavity-waveguide approach promising for use as a building block in directional nanophotonic circuits.
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• Abstract: We demonstrate electrically tunable, spin-dependent, directional coupling of single photons by embedding quantum dots (QDs) in a waveguide-coupled nanocavity. The directional behavior arises from direction-dependent interference between two cavity modes when coupled to the device waveguides. The small mode volume cavity enables simultaneous Purcell enhancement (${10.8\pm0.7}$) and peak directional contrast (${88\pm1\%}$), exceeding current state-of-the-art waveguide-only systems. We also present a scattering matrix model for the transmission through this structure, alongside a quantum trajectory-based model for predicting the system's directionality, which we use to explain the observed asymmetry in directional contrast seen in QD devices. Furthermore, the nanocavity enables wide-range electrical tuning of the emitter's directional contrast. We present results showing precise tuning of a QD emission line from a directional contrast of ${2\%}$ to ${96\%}$. In combination, these characteristics make this cavity-waveguide approach promising for use as a building block in directional nanophotonic circuits.

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