Ferroelectric microdomain reversal on Y-cut LiNbO3 surfaces

Holger Seibert; Wolfgang Sohler

doi:10.1117/12.24553

1 February 1991 Ferroelectric microdomain reversal on Y-cut LiNbO₃ surfaces

Holger Seibert, Wolfgang Sohler

Proceedings Volume 1362, Physical Concepts of Materials for Novel Optoelectronic Device Applications II: Device Physics and Applications; (1991) https://doi.org/10.1117/12.24553
Event: Physical Concepts of Materials for Novel Optoelectronic Device Applications, 1990, Aachen, Germany

Abstract

A periodic, electric field induced reversal of ferroelectric microdomains on (+Y)- and (—Y)- LiNbO3 surfaces was achieved for the first time at temperatures (< 400 °C) well below the Curie point. Contrary to the recently developed domain inversion processes on Z-cut substrates, no modification of the material (e.g. by a Ti-doping) nor an electron bombardment was necessary. The pyroelectric effect was used to generate an electrical field between photolithographically structured, periodic Al-electrodes on the surface of the crystal concentrating the electric field in the small volume of the microdomains to be inverted. As (+Y)- and (—Y)-LiNbO3 faces have strongly different etching rates in HF/HNO3, a successful domain reversal could be identified by selective etching. Microdomains of different dimensions (of typical 6x 15xO.25tm3), number of periodicities (100 and 1500) and periodicities (3Opm, 6.5,um and 7.6im) have been fabricated not only in undoped LiNbO3 surface layers, but also in Ti:LiNbO3 optical strip waveguides. The chosen periodicities will allow quasi-phase matched optical second harmonic generation.

Citation Download Citation

Holger Seibert and Wolfgang Sohler "Ferroelectric microdomain reversal on Y-cut LiNbO₃ surfaces", Proc. SPIE 1362, Physical Concepts of Materials for Novel Optoelectronic Device Applications II: Device Physics and Applications, (1 February 1991); https://doi.org/10.1117/12.24553

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