Purcell-Enhanced, Directional Light-Matter Interaction in a Waveguide-Coupled Nanocavity
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arXiv
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909459142410240 |
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| author | Martin, Nicholas J. Hallett, Dominic Duda, Mateusz Hallacy, Luke Callus, Elena Brunswick, Luke Dost, René Clarke, Edmund Patil, Pallavi K. Kok, Pieter Skolnick, Maurice S. Wilson, Luke R. |
| author_facet | Martin, Nicholas J. Hallett, Dominic Duda, Mateusz Hallacy, Luke Callus, Elena Brunswick, Luke Dost, René Clarke, Edmund Patil, Pallavi K. Kok, Pieter Skolnick, Maurice S. Wilson, Luke R. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_10351 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Purcell-Enhanced, Directional Light-Matter Interaction in a Waveguide-Coupled Nanocavity Martin, Nicholas J. Hallett, Dominic Duda, Mateusz Hallacy, Luke Callus, Elena Brunswick, Luke Dost, René Clarke, Edmund Patil, Pallavi K. Kok, Pieter Skolnick, Maurice S. Wilson, Luke R. Optics Applied Physics Quantum Physics 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. |
| title | Purcell-Enhanced, Directional Light-Matter Interaction in a Waveguide-Coupled Nanocavity |
| topic | Optics Applied Physics Quantum Physics |
| url | https://arxiv.org/abs/2501.10351 |