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Bullseye dielectric cavities for photon collection from a surface-mounted quantum-light-emitter

Hekmati, Reza, Hadden, John P. ORCID:, Mathew, Annie ORCID:, Bishop, Samuel G., Lynch, Stephen A. ORCID: and Bennett, Anthony J. ORCID: 2023. Bullseye dielectric cavities for photon collection from a surface-mounted quantum-light-emitter. Scientific Reports 13 (1) , 5316. 10.1038/s41598-023-32359-0

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Coupling light from a point source to a propagating mode is an important problem in nano-photonics and is essential for many applications in quantum optics. Circular “bullseye” cavities, consisting of concentric rings of alternating refractive index, are a promising technology that can achieve near-unity coupling into a first lens. Here we design a bullseye structure suitable for enhancing the emission from dye molecules, 2D materials and nano-diamonds positioned on the surface of these cavities. A periodic design of cavity, meeting the Bragg scattering condition, achieves a Purcell factor of 22.5 and collection efficiency of 80%. We also tackle the more challenging task of designing a cavity for coupling to a low numerical aperture fibre in the near field. Finally, using an iterative procedure, we study how the collection efficiency varies with apodised (non-periodic) rings.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Advanced Research Computing @ Cardiff (ARCCA)
Physics and Astronomy
Additional Information: License information from Publisher: LICENSE 1: URL:, Type: open-access
Publisher: Nature Research
Funders: EPSRC
Date of First Compliant Deposit: 3 April 2023
Date of Acceptance: 27 March 2023
Last Modified: 10 Jun 2024 09:18

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