Suppression of background emission for efficient single-photon generation in micropillar cavities

We optimize the efficiency of a quantum-dot-based micropillar single-photon source by minimizing spontaneous emission into unwanted background modes. perform numerical investigation emission, where we identify semi-periodic enhancement with diameter. At these peaks is reduced ?20%, and show how this reduction can be avoided simply choosing diameter away from peaks. Finally, analyze discrepancy between Purcell factor estimated experimental lifetime measurements true factor.