Liquid crystal as material for highly efficient phase shifters in integrated photonics

Jeroen Beeckman; Wim Bogaerts; Lukas Van Iseghem; Javier Pereiro García; Jiayi Liu

doi:10.1117/12.3017133

18 June 2024 Liquid crystal as material for highly efficient phase shifters in integrated photonics

Jeroen Beeckman, Wim Bogaerts, Lukas Van Iseghem, Javier Pereiro García, Jiayi Liu

Proceedings Volume PC13016, Liquid Crystals Optics and Photonic Devices; PC130160H (2024) https://doi.org/10.1117/12.3017133
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

Efficient, reliable and low power optical phase shifters are required in many applications of photonic integrated circuits. Thanks to their large birefringence, liquid crystals are an interesting material for obtaining large phase shifts with low voltages. Due to the high index difference between liquid crystal and silicon, the mode overlap is often small and the tuning effect limited. It is important to consider configurations in which there is a large mode overlap or periodic configurations that can enhance the electro-optic effect. We review a number of interesting configurations and discuss the need for accurate simulations of the liquid crystal behavior, both in two dimensional and three dimensional geometries. Next to maximising the tuning efficiency, it is important to keep the losses introduced by the liquid crystal minimal. We present accurate measurements of the scattering induced by liquid crystal and discuss theoretical models to estimate the amount of light scattering as a function of applied voltages.

Conference Presentation

Citation Download Citation

Jeroen Beeckman, Wim Bogaerts, Lukas Van Iseghem, Javier Pereiro García, and Jiayi Liu "Liquid crystal as material for highly efficient phase shifters in integrated photonics", Proc. SPIE PC13016, Liquid Crystals Optics and Photonic Devices, PC130160H (18 June 2024); https://doi.org/10.1117/12.3017133

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