Electro-optics; Electro=optic coefficients; Electrooptic effects; Electrooptical properties; Ferroelectric thin-films; Integrated photonic circuit; Linear electro-optic effect; Polycrystalline; Strain engineering; Thin film material; Electronic, Optical and Magnetic Materials
Résumé :
[en] Electro-optic thin film materials, which change their refractive index upon the application of an electric field, are crucial for the fabrication of optical modulators in integrated photonic circuits. Therefore, it is key to develop strategies to tune the linear electro-optic effect. Strain engineering has arisen as a powerful tool to optimize the electro-optic coefficients in ferroelectric thin films. In this report, the electro-optical properties of polycrystalline bismuth ferrite (BiFeO3) thin films are studied. The electro-optic coefficients (reff) of low-cost solution-processed BiFeO3 films under different substrate-induced thermal stress are characterized using a modified Teng-Man technique in transmission geometry. The influence of poling state and substrate stress on the electro-optical properties are discussed. The films show a notable piezo-electro-optic effect: the effective electro-optic coefficient increases both under compressive and tensile in-plane stress, with compressive stress having a much more profound impact. Electro-optic coefficients of 2.2 pm/V are obtained in films under a biaxial compressive stress of 0.54 GPa.
Disciplines :
Physique
Auteur, co-auteur :
Martínez, Alfredo Blázquez; Luxembourg Institute of Science and Technology, Materials Research and Technology, Belvaux, Luxembourg ; Department of Physics and Materials Science, University of Luxembourg, Belvaux, Luxembourg ; Inter-institutional Research Group Uni.lu–LIST on Ferroic Materials, Belvaux, Luxembourg
Grysan, Patrick; Luxembourg Institute of Science and Technology, Materials Research and Technology, Belvaux, Luxembourg
Girod, Stéphanie; Luxembourg Institute of Science and Technology, Materials Research and Technology, Belvaux, Luxembourg
Glinsek, Sebastjan; Luxembourg Institute of Science and Technology, Materials Research and Technology, Belvaux, Luxembourg ; Inter-institutional Research Group Uni.lu–LIST on Ferroic Materials, Belvaux, Luxembourg
Aruchamy, Naveen; Luxembourg Institute of Science and Technology, Materials Research and Technology, Belvaux, Luxembourg ; Department of Physics and Materials Science, University of Luxembourg, Belvaux, Luxembourg
BISWAS, Pranab ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS) ; Inter-institutional Research Group Uni.lu–LIST on Ferroic Materials, Belvaux, Luxembourg
GUENNOU, Mael ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS) ; Inter-institutional Research Group Uni.lu–LIST on Ferroic Materials, Belvaux, Luxembourg
Granzow, Torsten ; Luxembourg Institute of Science and Technology, Materials Research and Technology, Belvaux, Luxembourg ; Inter-institutional Research Group Uni.lu–LIST on Ferroic Materials, Belvaux, Luxembourg
Co-auteurs externes :
no
Langue du document :
Anglais
Titre :
Strain engineering of the electro-optic effect in polycrystalline BiFeO3 films [Invited]
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