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Q: Fachverband Quantenoptik und Photonik

Q 17: Quantum Optics (Miscellaneous) III

Q 17.2: Talk

Tuesday, March 15, 2022, 11:00–11:15, Q-H14

Exploring precise loss characterization methods for LNOI waveguides — •Silia Babel, Laura Padberg, Marcello Massaro, Christof Eigner, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute of Photonic Quantum Systems (PhoQS), Warburger Str. 100, 33098 Paderborn

Lithium Niobate (LN) has been a groundbreaking and benchmarking material platform for numerous integrated optical devices due to its great property portfolio, e.g. its large second-order nonlineartiy and electro-optical coefficients. A miniaturization of the current devices is desirable as this reduces the footprint and allows to integrate more complex structures on a chip, to increase the efficiency and to reduce the energy consumption. Here, the novel material platform Lithium Niobate on Insulator (LNOI) allows an tremendous step towards a further significant reduction as it combines the advantages of LN with a high index contrast change of the waveguides which makes it a very promising material for integrated photonic quantum technologies. For quantum applications low-loss optical devices are indispensable. This includes an optimization of waveguide propagation losses. In literature, different methods are used for estimating the propagation losses in LNOI waveguides. Yet, the question for a profound comparison between different methods remains unanswered. In order to provide this, we explore and compare different methods for waveguide loss characterization in LNOI waveguides, such as Fabry-Pérot or ring resonator method. These different methods will later set the ground for a versatile toolbox for nano-waveguide characterization.