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Q: Fachverband Quantenoptik und Photonik

Q 13: Quantum Optics and Photonics II

Q 13.3: Vortrag

Montag, 11. März 2019, 14:45–15:00, S Gr. HS Maschb.

Integrated Electrooptic Modulators in LiNbO₃ for Quantum Optics — •Patrick Bartkowiak, Marcello Massaro, Felix vom Bruch, Christof Eigner, Raimund Ricken, Viktor Quiring, Kai Hong Luo, Harald Herrmann, and Christine Silberhorn — Universität Paderborn, Integrierte Quantenoptik, Warburger Str. 100, D-33098 Paderborn

Compact, low-loss modulators are key components for numerous quantum optic applications in the future. Such devices must be capable to manipulate the light which propagates through the device regarding polarization, phase or amplitude by an electrical control signal. Integrated electro-optic modulators in LiNbO₃ are attractive candidates to fulfill such requirements. Presently, such devices are well established components in particular in high bandwidth optical transmission systems. Quantum optic experiments demand fast, low loss, and compact devices. Therefore, the modulator’s design and fabrication technology require a refinement.
We report on our progress in the development of low-loss electro-optic modulators relying on titanium in-diffused waveguides and directional couplers in LiNbO₃. The results on the development of a fiber-coupled 2x2 spatial switch based on an electro-optically switchable directional coupler will be presented. In particular, the optimized coupler design, the electrode configuration for fast switching and means for minimizing fiber-waveguide coupling losses will be discussed. Potential implementation for such 2x2 low-loss switches can be in realizing time-multiplexed heralded single photon sources.