Christian Koos Wolfgang Freude Sebastian Randel Philipp-Immanuel Dietrich Matthias Blaicher Yilin Xu Muhammad Rodlin Billah Tobias Hoose Mareike Trappen A. Hofmann Efficient Coupling Interfaces in Photonic Systems Enabled by Printed Freeform Micro-Optics. 1-2 2018 ICTON https://doi.org/10.1109/ICTON.2018.8473851 conf/icton/2018 db/conf/icton/icton2018.html#KoosFRDBXBHTH18