On-chip Integrable Spectrally Uniform Quantum Dot Single Photon Source Array for Scalable Quantum Optical Networks: Study of QD symmetry and Excitonic Structure*

Towards the goal of building scalable on-chip optical networks we have proposed a new paradigm that integrates an array of single quantum dot single photon sources (SPSs) with dielectric light manipulating elements (LMEs) [1] and demonstrated arrays of InGaAs/GaAs mesa top single quantum dot (MTSQD) [1, 2] SPSs with ~80% single photon emission purity up to 77K and an order of magnitude better spectral uniformity [1] than the typical self-assembled island QDs. With planarizing overgrowth, the MTSQD arrays can be readily integrated with LMEs towards interconnected optical networks. In this talk we present power dependent photoluminescence (PL), time resolved PL, and polarization dependent PL studies to reveal the QD excitonic structure and the symmetry of the electron and hole wavefunctions towards the QD-LME integration and demonstration of photon entanglement. The impact of the mesa on the symmetry of the far-field emission pattern is studied using finite element method to assist the assessment of the QD confinement potential symmetry. Work on QD-LME integration is undergoing.

[1] J. Zhang et.al, J. Appl. Phys. 120, 243103 (2016).
[2] J. Zhang et.al, Jour. Vac. Sc. Tech. B32, 02C106 (2014).