Electro-optic effect in thin film strontium barium niobate (SBN) grown by RF magnetron sputtering on SrTiO3 substrates

Author:

Christensen Adam1ORCID,Reynaud Marc1ORCID,Posadas Agham B.1ORCID,Zhan Xun2,Warner Jamie H.23,Demkov Alexander A.1ORCID

Affiliation:

1. Department of Physics, University of Texas at Austin 1 , Austin, Texas 78712, USA

2. Texas Materials Institute, University of Texas at Austin 2 , Austin, Texas 78712, USA

3. Walker Department of Mechanical Engineering, University of Texas at Austin 3 , Austin, Texas 78712, USA

Abstract

Ferroelectric strontium barium niobate (SrxBa1−xNb2O6 or SBN) is a material with high electro-optic (EO) response. It is currently of interest in low voltage silicon-integrated photonics (SiPh). We have grown strongly textured SBN films with x = 0.65 by radio frequency sputtering on (100)-oriented SrTiO3 substrates where grains with mixed (310) and (001) out-of-plane orientation form. For these mixed orientation films, we observed a maximum effective EO coefficient of 230 pm/V using a transmission EO measurement geometry that is responsive only to the in-plane polarization component coming from the (310)-oriented grains. We also demonstrate that by growing SBN on TiO2-terminated SrTiO3 substrates, we can obtain predominantly (001)-oriented SBN films with out-of-plane polarization. Transmission EO measurements on such (001)-oriented films show a reduced effective Pockels coefficient of 88 pm/V, which is consistent with the overall ferroelectric polarization becoming out-of-plane. This work shows that controlling substrate termination is effective in controlling the grain orientation of SBN films grown on top and that one can readily integrate SBN films on SrTiO3-buffered Si for use in SiPh.

Funder

Air Force Office of Scientific Research

Publisher

AIP Publishing

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