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Title: Transient grating in a KNbO{sub 3}/KTaO{sub 3} superlattice

Abstract

Time-resolved degenerate-four-wave-mixing (DFWM) techniques have been used to characterize the nonlinear optical response of a KNbO{sub 3}/KTaO{sub 3} superlattice grown by pulsed laser deposition on a 1 mm thick, (001)-oriented KTaO{sub 3} substrate. With a 30 psec pulsed laser, the difference in the nonlinear optical response between bulk KTaO{sub 3} and the superlattice was measured. Results indicate that a significant contribution to the response signal is due to the KNbO{sub 3} superlattice. The {chi}{sup (3)} value was estimated to have increased by 2 orders of magnitude compared to the bulk crystal.

Authors:
; ;  [1];  [2]
+ Show Author Affiliations
  1. Univ. of Puerto Rico, Mayaguez (Puerto Rico). Dept. of Physics
  2. Oak Ridge National Lab., TN (United States). Solid State Div.
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (United States)
Sponsoring Org.:
USDOE Office of Energy Research, Washington, DC (United States); National Aeronautics and Space Administration, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
OSTI Identifier:
658429
Report Number(s):
ORNL/CP-98324; CONF-980731-
ON: DE98005662; BR: KC0202020; CNN: Grant DE-FRO2-94ER757640;Grant US ARO DAAH04-96-10416;Grant NASA-URC NCCW-0088;Grant NSF EHR-9108775; TRN: AHC2DT06%%313
DOE Contract Number:
AC05-96OR22464
Resource Type:
Technical Report
Resource Relation:
Conference: 43. international symposium on optical science, engineering, and instrumentation, San Diego, CA (United States), 19-24 Jul 1998; Other Information: PBD: Jun 1998
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; HARMONIC GENERATION; NONLINEAR OPTICS; OPTICAL PROPERTIES; SUPERLATTICES; NIOBATES; TANTALATES; POTASSIUM COMPOUNDS; EXPERIMENTAL DATA

Citation Formats

Liu, H., Fernandez, F., Jia, W., and Boatner, L.A.. Transient grating in a KNbO{sub 3}/KTaO{sub 3} superlattice. United States: N. p., 1998. Web. doi:10.2172/658429.
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Liu, H., Fernandez, F., Jia, W., & Boatner, L.A.. Transient grating in a KNbO{sub 3}/KTaO{sub 3} superlattice. United States. doi:10.2172/658429.
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Liu, H., Fernandez, F., Jia, W., and Boatner, L.A.. Mon . "Transient grating in a KNbO{sub 3}/KTaO{sub 3} superlattice". United States. doi:10.2172/658429. https://www.osti.gov/servlets/purl/658429.
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@article{osti_658429,
title = {Transient grating in a KNbO{sub 3}/KTaO{sub 3} superlattice},
author = {Liu, H. and Fernandez, F. and Jia, W. and Boatner, L.A.},
abstractNote = {Time-resolved degenerate-four-wave-mixing (DFWM) techniques have been used to characterize the nonlinear optical response of a KNbO{sub 3}/KTaO{sub 3} superlattice grown by pulsed laser deposition on a 1 mm thick, (001)-oriented KTaO{sub 3} substrate. With a 30 psec pulsed laser, the difference in the nonlinear optical response between bulk KTaO{sub 3} and the superlattice was measured. Results indicate that a significant contribution to the response signal is due to the KNbO{sub 3} superlattice. The {chi}{sup (3)} value was estimated to have increased by 2 orders of magnitude compared to the bulk crystal.},
doi = {10.2172/658429},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jun 01 00:00:00 EDT 1998},
month = {Mon Jun 01 00:00:00 EDT 1998}
}
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Technical Report:
View Technical Report (0.43 MB)
DOI:  10.2172/658429
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  • ; ; ; ... - Applied Physics Letters
    Symmetric superlattice structures consisting of alternating atomic-scale layers of KTaO{sub 3} and KNbO{sub 3} with variable periodicity were grown on KTaO{sub 3} substrates by pulsed laser deposition. The in-plane structure of KNbO{sub 3} closely matches that of the KTaO{sub 3} substrate, resulting in KTaO{sub 3}/KNbO{sub 3} heterostructures that are uniformly strained in-plane without misfit dislocations. This strain imposes an in-plane KNbO{sub 3} lattice spacing identical to that of the KTaO{sub 3} substrate for the temperature range 30{degree}C{lt}T{lt}700{degree}C, and a tetragonal-to-tetragonal transition is observed whose phase transition temperature T{sub c} depends on the KNbO{sub 3} layer thickness. The in-plane strain resultsmore » in a significant increase in this ferroelectric-paraelectric T{sub c} for superlattices with relatively thick KNbO{sub 3} layers (T{sub c}=535{degree}C for a 17 nm thick layer, as compared to 435{degree}C for bulk KNbO{sub 3}) and for K(Nb{sub 0.5}Ta{sub 0.5})O{sub 3} random-alloy thin films. As the superlattice period decreases, a reduction of T{sub c} is observed. For superlattices with periodicities of 50 {Angstrom} or less, the Curie temperature is identical to that of the K(Ta{sub 0.5}Nb{sub 0.5})O{sub 3} random-alloy film, indicating significant long-range ferroelectric coupling across the KTaO{sub 3} layers. {copyright} {ital 1998 American Institute of Physics.}« less

  • ; ; ; ... - Applied Physics Letters
    Potassium niobate (KNbO{sub 3}) thin films and potassium niobate/tantalate (KNbO{sub 3}/KTaO{sub 3}) superlattices have been grown on KTaO{sub 3} (001) substrates by pulsed laser deposition. The thin-film structures were analyzed by Rutherford backscattering/ion-channeling techniques, x-ray {theta}{endash}2{theta} and {Phi} scans, and both conventional and {ital Z}-contrast scanning transmission electron microscopy. Excellent film flatness and crystallinity are evidenced by these techniques. At room temperature, the KNbO{sub 3} films are characterized by an orthorhombic structure which differs from that of bulk KNbO{sub 3}. The interfaces between the layers in the KNbO{sub 3}/KTaO{sub 3} superlattice structures were found to be compositionally sharp on anmore » atomic scale. {copyright} {ital 1996 American Institute of Physics.}« less

  • ; ; ; ...
    We use molecular-dynamics simulation to examine the order-disorder behavior in pure ferroelectric KNbO{sub 3} and in KNbO{sub 3}-KTaO{sub 3} ferroelectric-paraelectric solid solutions and superlattices. We find that the order-disorder behavior is remarkably robust and plays an important role in both the polarization rotation associated with switching of the perfect crystal and in the dynamical behavior of the solid solutions and superlattices.

  • - Physical Review Letters
    No abstract prepared.

  • ; ; ; ... - Journal of Vacuum Science & Technology A
    The synthesis and properties of asymmetric KNbO{sub 3}KTaO{sub 3} superlattices is examined. Interdigitated electrodes are fabricated for temperature-dependent capacitance measurements. The nonlinear dielectric response of 1/N superlattice exhibits the anomalous positive tunability behavior indicative of antiferroelectricity. In contrast, the N/1 KNbO{sub 3}/KTaO{sub 3} structures (N > 1) appear to be either ferroelectric or paraelectric, depending on the temperature. Discussion of possible mechanisms for this behavior is given.