3D-printed microoptics for efficient coupling of quantum components

Project of Prof. Dr. Alois Herkommer (ITO), Prof. Dr. Harald Giessen (PI4)

Non-classical light sources, such as single quantum dots or NV centers, need to be efficiently coupled to the other components of the quantum or photonic network. Photon transport between components can be achieved via optical fibers, however a critical aspect is the associated photon loss at the interfaces. Goal of this project is to employ modern 3D-printing technologies to develop micro-optical components to minimize the loss, increase the efficiency and maximize the level of integration.

In detail we want to design and fabricate highly efficient micro-optical and micro-alignment systems via 3D femtosecond direct laser writing to maximize the transfer of photons from the quantum dot to a single mode optical fiber. Two Ph.D. candidates will theoretically investigate limitations of light transfer from the emission mode of the light source to the mode of the optical fiber. Based on that, they will design and create appropriate CAD-models for the optics, their support structures and micro-alignment structures. In the printing process possible shrinkage of the material, as well as achromaticity and material aspects need to be taken into account to finally provide an efficient, transportable and robust photonic coupling system for quantum devices to the research cluster.

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