The aim of this project is to generate non-classical light at telecom wavelengths (1.55 μm). It is based on self-assembled InP quantum dots that are deterministically integrated into photonic microstructures. The project has three main goals: External control of electronic states of the quantum dots, increasing the decoupling efficiency of the quantum dots for effective single-photon emission and twin-photon emission studies, and electrical generation of single photons.
These goals are achieved through optimized epitaxial growth, emission control via strain tuning, and integration of quantum dots into microlenses via in-situ electron beam lithography. In combination with a substrate-side mirror, the microlenses have a spectrally broadband decoupling efficiency as an ideal basis for effective optical and quantum-optical spectroscopy of the telecom quantum emitters. Single photon emission is realized via electrically contacted microlenses, which also control the charge carrier configuration of excitonic complexes. The generation of twin photon pairs is based on the temporally correlated photon emission of the spectrally degenerate biexciton-exciton cascade. For a systematic study of this process, optically driven microlenses are equipped with piezoelectric elements so that the biexciton binding energy is tuned to the fine structure splitting of the bright exciton, which is the basis for twin photon emission.
|Deutsche Forschungsgemeinschaft (DFG)