Blue-to-green single photons from InGaN/GaN dot-in-a-nanowire ordered arrays

Abstract

Single-photon emitters (SPEs) are at the basis of many applications for\nquantum information management. Semiconductor-based SPEs are best suited for\npractical implementations because of high design flexibility, scalability and\nintegration potential in practical devices. Single-photon emission from ordered\narrays of InGaN nano-disks embedded in GaN nanowires is reported. Intense and\nnarrow optical emission lines from quantum dot-like recombination centers are\nobserved in the blue-green spectral range. Characterization by electron\nmicroscopy, cathodoluminescence and micro-photoluminescence indicate that\nsingle photons are emitted from regions of high In concentration in the\nnano-disks due to alloy composition fluctuations. Single-photon emission is\ndetermined by photon correlation measurements showing deep anti-bunching minima\nin the second-order correlation function. The present results are a promising\nstep towards the realization of on-site/on-demand single-photon sources in the\nblue-green spectral range operating in the GHz frequency range at high\ntemperatures.\n