AVS 52nd International Symposium
    Electronic Materials and Processing Tuesday Sessions
       Session EM-TuP

Paper EM-TuP30
Large Nonlinear Optical Properties of Lead Magnesium Niobate-Lead Titanate Thin Films Grown by Pulsed Laser Deposition

Tuesday, November 1, 2005, 4:00 pm, Room Exhibit Hall C&D

Session: Electronic Materials and Processing Poster Session
Presenter: D.-R. Liu, National Applied Research Laboratories,Taiwan
Authors: D.-R. Liu, National Applied Research Laboratories,Taiwan
P.-T. Cheng, National Applied Research Laboratories,Taiwan
S.-L. Ou, National Taiwan Normal University, Taiwan
J.-S. Chen, National Applied Research Laboratories, Taiwan
C.-P. Cheng, National Taiwan Normal University, Taiwan
Correspondent: Click to Email
Thin film optical devices have been especially attractive because of their potential for the integration with electronic and optoelectronic systems. Owing to its ferroelectricity, high dielectric constant, and large electro-optic coefficients, Lead magnesium niobate-lead titanate (PMN-PT) can be used in many applications that include pyroelectric detectors, thin film capacitors, nonvolatile memory, and nonlinear optical devices. Because of good transparency over a wide wavelength range of 500nm-7000nm, PMN-PT best suited for almost all the visible to mid IR optical applications. In this study, highly textured thin films of lanthanum doped lead titanate were grown by pulsed laser deposition (PLD) on MgO substrates. The measurement of glancing-angle x-ray powder diffraction (GAXRD) was used to determine the structure of the PMN-PT films. The thickness and roughness of the films were characterized by grazing-incidence x-ray reflectivity (GIXR), and the complex refractive indices were measured in the range from 1.5 to 4.1 eV by spectroscopic ellipsometry (SE). The average oscillator strength and its associated wavelength were estimated by using a Sellmeier-type dispersion equation. Z-scan measurements were performed to study the third-order optical nonlinearity. It was found that the PMN-PT films grown on MgO substrates exhibited strong nonlinear optical effect. The results show that PMN-PT thin films are promising materials for nonlinear optics.