Applications in, e.g., optical communication, light routing, and emerging optical quantum technologies on a chip call for waveguide networks featuring tight control over the photons used. Quantum simulators on a chip harness this high level of control to guide and manipulate entangled photon states in sophisticated networks to gain insight into the role of entanglement in interacting many-body systems.
We have recently shown direct laser written polymer waveguides fabricated from a low-fluorescent negative tone photoresist via two-photon lithography . These waveguides feature bend radii down to 40 µm and loss coefficients smaller than 0.81 dB/mm, facilitating networks with high integration density. For coupling control, a novel three-dimensional coupler design was shown, giving optical access to all in- and outputs of the waveguide network simultaneously via one microscope objective.
We present an in-depth analysis and optimization of these coupling structures in simulation and experiment.
 A. Landowski et al., APL Photonics 2, 106102 (2017)
Alexander Landowski, Stefan Guckenbiehl, Marius Schönberg, Jonas Gutsche, Georg von Freymann, and Artur Widera, "Integrating quantum emitters into polymer waveguides (Conference Presentation)," Proc. SPIE 10675, 3D Printed Optics and Additive Photonic Manufacturing, 1067508 (Presented at SPIE Photonics Europe: April 23, 2018; Published: 29 May 2018); https://doi.org/10.1117/12.2306205.5791127125001.
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