2025/03/12 by Luke Brunswick, L. Hallacy, Brunswick, Luke A. F. +9 · 2 citations
Physics and Astronomy · #Applied Physics (physics.app-ph) #FOS: Physical sciences #Optics (physics.optics) #Photonic Crystals and Applications #Quantum Physics (quant-ph)
paper · pdf · doi:10.48550/arxiv.2503.09482
openalex publication_date 2025/03/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 Δλ= 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 FP = 3.5.