Freiburg 2019 – scientific programme
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FM: Fall Meeting
FM 84: Poster: Quantum Networks
FM 84.9: Poster
Thursday, September 26, 2019, 16:30–18:30, Tents
Towards hybrid waveguides in lithium niobate for quantum optical applications — •Maxmilian Protte1, Lena Ebers2, Jan Philipp Höpker1, Basudeb Sain1, Julian Brockmeier1, Raimund Ricken1, Manfred Hammer2, Christof Eigner1, Jens Förstner2, Christine Silberhorn1, and Tim Bartley1 — 1Department Physik, Universität Paderborn, Warburger Straße 100, 33098 Paderborn, Germany — 2Department Elektrotechnik und Informationstechnik, Universität Paderborn, Warburger Straße 100, 33098 Paderborn, Germany
In recent years there has been a great number of optical devices realized in titanium in-diffused lithium niobate waveguides. One great advantage is the on-chip coupling efficiency (≥80%) which results from the good overlap between the fiber mode and the waveguide mode. A significant challenge is efficiently coupling between titanium in-diffused waveguides and material systems with much smaller optical mode dimensions, such as semiconductor waveguides or superconducting detectors. One approach is the use of tapers consisting of a high refractive index material such as silicon, and vertical evanescent coupling between the two waveguide structures. We theoretically and experimentally investigate this approach to increase the detection efficiency of superconducting integrated detectors, which would further increase the versatility of an already promising platform for integrated photonics.