We report finite difference time domain simulations of GaAs-Al0.95Ga0.05As micropillars containing single quantum dots with SiO2 microlenses of differing shapes and heights, finding an approximately linear reduction in the numerical aperture and mode field diameter of the outcoupled emissions via the fundamental mode. This opens the possibility of modifying our previously reported direct-write lithography process to leave an amount of hard mask on top of the pillar, which could modify the light emitted from our single photon sources to be more efficiently coupled into an output single mode fibre.
In this work we demonstrate a record optical power of single-photon flux measured on a SI-traceable trap detector. This flux was measured using a single-mode fiber, allowing for the absolute calibration of a superconducting nanowire detector. Single-photons from an InGaAs quantum dot in a micropillar cavity were determined to have an optical power of 1.06±0.03pW or 4.95±0.14 ×10^6 photons per second as measured on the calibrated trap detector. The single-photon fluorescence at this power exhibited a g(2)(τ=0) of 0.13.
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