We propose an optical cavity with deep subwavelength confinement of light in a region that simultaneously works as a quantum dot. The design is based on a dielectric membrane with a buried quantum well and restricts the electron and hole wave functions to the area of the optical hotspot to overcome the challenge of colocating an optical cavity with a quantum emitter. Combined with proper surface passivation, this geometry points towards the deterministic fabrication of functional quantum dots in optical cavities by lithographic means.

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• Integrated optics
• Semiconductor quantum optics
• Optical microcavities
• Quantum dots