Electro-Optical Modulation Based on Pockels Effect in BaTiO3 With a Multi-Domain Structure

P. Castéra (1) , Ana Gutierrez (1) , Domenico Tulli (2) , Sébastien Cueff (3) , Régis Orobtchouk (3) , Pedro Rojo Romeo (3) , Guillaume Saint-Girons (4) , Pablo Sanchis (1)

1 Nanophotonics Technology Center
2 DAS Photonics - DAS Photonics
3 INL - Photonique - INL - Nanophotonique
4 INL - H&N - INL - Hétéroepitaxie et Nanostructures

The influence of an in-plane multi-domain structure in BaTiO3 films grown on SrTiO3/Si buffers for highly efficient electro-optic modulation has been analyzed. The modulation performance can be significantly enhanced by rotating a certain angle, the optical waveguide, with respect to the BaTiO3 crystallographic axes. A robust electro-optical performance against variations in the domain structure as well as the lowest Vπ voltage can be achieved by using the rotation angles between 35° and 55°. Our calculations show that Vπ voltages below 1.7 V for a modulation length of 2 mm can be obtained by means of a CMOS compatible hybrid silicon/BaTiO3 waveguide structure.

Mots clés: modulators; Waveguide modulator; ferroelectrics; Electrooptical waveguides; Optical refraction; Electrooptic modulators; Optical variables control; Optical polarization

Domaines: Sciences de l'ingénieur [physics]; Micro et nanotechnologies/Microélectronique; Optique / photonique

P. Castéra, Ana Gutierrez, Domenico Tulli, Sébastien Cueff, Régis Orobtchouk, et al.. Electro-Optical Modulation Based on Pockels Effect in BaTiO3 With a Multi-Domain Structure. IEEE Photonics Technology Letters, 2016, 28 (9), pp.990. ⟨10.1109/LPT.2016.2522509⟩. ⟨hal-01489122⟩