Purcell‐Enhanced Single‐Photon Emission in the Telecom C‐Band

Abstract

Abstract Purcell‐enhanced quantum dot single‐photon emission in the telecom C‐band from InAs quantum dots inside circular Bragg grating cavities is shown. The InAs quantum dots are grown by means of molecular beam epitaxy on an InP substrate and are embedded into a quaternary In 0.53 Al 0.23 Ga 0.24 As membrane structure. In a post‐growth flip‐chip process with subsequent substrate removal and electron beam‐lithography, circular Bragg grating (“bullseye”) resonators are defined. Micro‐photoluminescence studies of the devices at cryogenic temperatures of K reveal individual quantum dot emission lines into a pronounced cavity mode. Time‐correlated single‐photon counting measurements under above‐band gap excitation yield Purcell‐enhanced excitonic decay times of ps corresponding to a Purcell factor of . Pronounced photon antibunching with a background limited is observed, which demonstrates that the light originated mostly from one single quantum dot.