Towards an Electro-Optical Driven Single Photon Device

As a prototype towards a single photon source we present a quantum-dot-based device, which is tunable and fully electrically pumped. Both the electrical pumping process and the manipulation of the emission wavelength of the quantum dots are independently achieved in this three-terminal device. We realized this approach by electro-optically pumping the quantum dots via a light-emitting diode which is monolithically integrated underneath the quantum dot layer. Independently from the pumping process, electrical tuning of the emission wavelength of the quantum dots is achieved by the quantum confined Stark effect using a third contact. This device structure is fully extensible with high quality resonators based, for instance, on photonic crystal structures targeting high extraction efficiencies via the Purcell effect.