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arXiv · 2503.09482

Electro-mechanically tunable, waveguide-coupled photonic-crystal cavities with embedded quantum dots

Luke A. F. Brunswick·Luke Hallacy·René Dost·Edmund Clarke·Maurice S. Skolnick·Luke R. Wilson
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Abstract

On-chip micro-cavities with embedded quantum emitters provide an excellent platform for high-performance quantum technologies. A major difficulty for such devices is overcoming the detrimental effects of fluctuations in the device dimensions caused by the limitations of the fabrication processes. We present a fully tunable system based on a 1D photonic-crystal cavity with an embedded quantum dot, which enables tuning of both the quantum dot emission energy and the cavity mode wavelength. A micro-electromechanical cantilever is used to tune the cavity mode wavelength via index modulation and the quantum-confined Stark effect is used to tune the quantum dot emission energy, mitigating the effect of fabrication imperfections. To demonstrate the operation of the device, a maximum, voltage-controllable cavity tuning range of $\Delta \lambda = 1.8$ nm is observed. This signal is measured at the end of a bus waveguide which side-couples to the cavity, enabling the coupling of multiple cavities to a common waveguide, a key requirement for scale-up in these systems. Additionally, a quantum dot is tuned into resonance with the cavity mode, exhibiting an enhanced emission rate with a resolution limited Purcell factor of $F_P = 3.5$.

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Luke A. F. Brunswick, Luke Hallacy, René Dost, Edmund Clarke, Maurice S. Skolnick, Luke R. Wilson. 2025-03-12. Electro-mechanically tunable, waveguide-coupled photonic-crystal cavities with embedded quantum dots. https://arxiv.org/abs/2503.09482

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