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Title: Strain-controlled optical absorption in epitaxial ferroelectric BaTiO{sub 3} films

A lattice strain of 0.3%–1.3% is achieved in epitaxial tetragonal BaTiO{sub 3} films grown on (001)-oriented SrTiO{sub 3} single-crystal substrates. Our experimental studies of absorption spectra in the range of 0.74–9.0 eV demonstrate that epitaxy produces significant changes in the optical properties of the films compared with those of a reference polydomain BaTiO{sub 3} crystal: the absorption edge and the peak at 5 eV strongly blue-shift by 0.2–0.4 eV, the magnitude of the peak at 5 eV drops, and certain spectral features disappear, whereas the absorption peak at 8.5 eV remains unchanged. The observed behavior is attributed to ferroelectric polarization, which is enhanced by epitaxial strain in the films. Our results indicate that epitaxially induced variations of ferroelectric polarization may be used to tailor the optical properties of thin films for photonic and optoelectronic applications.
Authors:
 [1] ;  [2] ; ; ; ; ;  [1] ;  [3] ;  [2]
  1. Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 18221 Prague 8 (Czech Republic)
  2. (Czech Republic)
  3. Microelectronics and Materials Physics Laboratories, University of Oulu, P.O. Box 4500, FI-90014 Oulun yliopisto (Finland)
Publication Date:
OSTI Identifier:
22399049
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 19; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTRA; BARIUM COMPOUNDS; COMPARATIVE EVALUATIONS; CRYSTAL STRUCTURE; EPITAXY; EV RANGE; FERROELECTRIC MATERIALS; MONOCRYSTALS; OPTICAL PROPERTIES; POLARIZATION; STRAINS; STRONTIUM TITANATES; SUBSTRATES; THIN FILMS