US 12,484,339 B2
Photon source and method of fabricating a photon source
Andrea Barbiero, Cambridge (GB); Joanna Krystyna Skiba-Szymanska, Cambridge (GB); Richard Mark Stevenson, Cambridge (GB); and Andrew James Shields, Cambridge (GB)
Assigned to Kabushiki Kaisha Toshiba, Tokyo (JP)
Filed by Kabushiki Kaisha Toshiba, Tokyo (JP)
Filed on Aug. 12, 2022, as Appl. No. 17/886,794.
Claims priority of application No. 2118970 (GB), filed on Dec. 23, 2021.
Prior Publication US 2023/0207727 A1, Jun. 29, 2023
Int. Cl. H10H 20/814 (2025.01); H10H 20/01 (2025.01); H10H 20/81 (2025.01); H10H 20/812 (2025.01); H10H 20/819 (2025.01); H10H 20/824 (2025.01)
CPC H10H 20/8142 (2025.01) [H10H 20/013 (2025.01); H10H 20/812 (2025.01); H10H 20/819 (2025.01); H10H 20/81 (2025.01); H10H 20/8242 (2025.01)] 17 Claims
OG exemplary drawing
 
1. A photon source comprising:
a quantum dot; and an optical cavity,
the optical cavity comprising:
a diffractive Bragg grating “DBG”; and
a planar reflection layer,
the DBG comprising a plurality of concentric reflective rings surrounding a central disk and at least one conductive track extending from the central disk across the plurality of concentric rings, the quantum dot being provided within the central disk and the planar reflection layer being provided on one side of the DBG to cause light to be preferentially emitted from the opposing side of the DBG.