On-Chip Waveguide Coupling of a Layered Semiconductor Single-Photon Source

4 years ago

On-Chip Waveguide Coupling of a Layered Semiconductor Single-Photon Source

Rudolf Bratschitsch, Steffen Michaelis de Vasconcellos, Philipp Tonndorf, Alexander I. Dmitriev, Nico Gruhler, Wolfram Pernice, Anatoly P. Bakhtinov, Robert Schmidt, Alexander I. Tartakovskii, Osvaldo Del Pozo-Zamudio, Johannes Kern

Fully integrated quantum technology based on photons is in the focus of current research, because of its immense potential concerning performance and scalability. Ideally, the single-photon sources, the processing units, and the photon detectors are all combined on a single chip. Impressive progress has been made for on-chip quantum circuits and on-chip single-photon detection. In contrast, nonclassical light is commonly coupled onto the photonic chip from the outside, because presently only few integrated single-photon sources exist. Here, we present waveguide-coupled single-photon emitters in the layered semiconductor gallium selenide as promising on-chip sources. GaSe crystals with a thickness below 100 nm are placed on Si₃N₄ rib or slot waveguides, resulting in a modified mode structure efficient for light coupling. Using optical excitation from within the Si₃N₄ waveguide, we find nonclassicality of generated photons routed on the photonic chip. Thus, our work provides an easy-to-implement and robust light source for integrated quantum technology.

Publisher URL: http://dx.doi.org/10.1021/acs.nanolett.7b02092

DOI: 10.1021/acs.nanolett.7b02092