Erlangen 2022 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 38: Photonics II
Q 38.1: Talk
Wednesday, March 16, 2022, 14:00–14:15, Q-H15
Cryogenic electro-optic modulation in titanium in-diffused lithium niobate waveguides — •Frederik Thiele1, Felix vom Bruch2, Julian Brockmeier1, Maximilian Protte1, Thomas Hummel1, Raimund Ricken2, Victor Quiring2, Sebastian Lengeling2, Harald Herrmann2, Christof Eigner2, Christine Silberhorn2, and Tim J. Bartley1 — 1Mesoscopic Quantum Optics, Department of Physics, Paderborn University, Warburger Str. 100, 33098 Paderborn, Germany — 2Integrated Quantum Optics, Department of Physics, Paderborn University, Warburger Str. 100, 33098 Paderborn, Germany
Lithium niobate is an important platform for integrated quantum photonics given its high second-order nonlinearity and electro-optic properties. The integration of superconducting single photon detectors offers new prospects for efficiency and scalability. In recent years frequency conversion, integrated SNSPDs and electro-optic modulation has been shown in lithium niobate at cryogenic temperatures. To combine single photon detection together with modulators, the electrooptic modulation in lithium niobate must be characterized. We show the characterization of electro-optic modulators in titanium in diffused lithium niobate waveguides at cryogenic temperatures. To do so, we realized a phase modulator, directional coupler and polarization converter below 8.5K. The decrease of the operation temperature shows an increase of the required operation voltage for all three modulators. Additionally, we give an outlook on the optimization for the cryogenic operation.