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We report on the design of nanohole/nanobeam cavities in ridge waveguides for on-chip, quantum-dot-based single-photon generation. Our design overcomes limitations of a low-refractive-index-contrast material platform in terms of emitter-mode coupling efficiency and yields an outcoupling efficiency of 0.73 to the output ridge waveguide. Importantly, this high coupling efficiency is combined with broadband operation of 9 nm full-width half-maximum. We provide an explicit design procedure for identifying the optimum geometrical parameters according to the developed design. Besides, we fabricate and optically characterize a proof-of-concept waveguide structure. The results of the microphotoluminescence measurements provide evidence for cavity-enhanced spontaneous emission from the quantum dot, thus supporting the potential of our design for on-chip single-photon sources applications.
We report on a simple nanopost single-photon source geometry based on a quantum dot in a mesa placed on a metal mirror. A remarkably large Purcell enhancement of 9 for the smallest structure is obtained.
We theoretically investigate the potential of the extreme mode-confinement waveguides for single-photon sources. Confining light far below the diffraction limit in a V-groove GaAs-on-insulator waveguide, we enhance the Purcell factor by a factor of eight.
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