Electro-mechanically tunable, waveguide-coupled photonic-crystal cavities with embedded quantum dots
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 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 .
Cite
@article{arxiv.2503.09482,
title = {Electro-mechanically tunable, waveguide-coupled photonic-crystal cavities with embedded quantum dots},
author = {Luke A. F. Brunswick and Luke Hallacy and René Dost and Edmund Clarke and Maurice S. Skolnick and Luke R. Wilson},
journal= {arXiv preprint arXiv:2503.09482},
year = {2025}
}