Nanowire Quantum Dot Emitters Evanescently Coupled On-Chip via Curved and Segmented SiN Waveguides.

This work implements a hybrid device based on a semiconductor quantum dot embedded within a nanowire to bridge a noncontinuous curved waveguide structure. The geometry takes advantage of evanescent coupling between the photonic structures to recover single photons emitted from both outputs of the device. Auto- and cross-correlation measurements were performed on different output facets of the device. We demonstrate single-photon emission from both ends of the nanowire for both neutral, X and XX, and charged X -, excitonic complexes. We further demonstrate the cascaded XX - X emission by collecting each complex from a different facet. This work lays the foundation for on-chip architectures which utilize multidirectional integration of quantum emitters.