Počet záznamů: 1  

Strain-controlled optical absorption in epitaxial ferroelectric BaTiO.sub.3./sub. films

  1. 1. 0449010 - FZU-D 2016 RIV US eng J - Článek v odborném periodiku
    Chernova, Ekaterina - Pacherová, Oliva - Chvostová, Dagmar - Dejneka, Alexandr - Kocourek, Tomáš - Jelínek, Miroslav - Tyunina, Marina
    Strain-controlled optical absorption in epitaxial ferroelectric BaTiO3 films.
    Applied Physics Letters. Roč. 106, č. 19 (2015), "192903-1"-"192903-4" ISSN 0003-6951
    Grant CEP: GA ČR GA15-13778S; GA ČR GA15-15123S
    Institucionální podpora: RVO:68378271
    Klíčová slova: thin-films * polarization * evolution * SrTiO3
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 3.142, rok: 2015

    A lattice strain of 0.3%-1.3% is achieved in epitaxial tetragonal BaTiO3 films grown on (001)-oriented SrTiO3 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 BaTiO3 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.
    Trvalý link: http://hdl.handle.net/11104/0250598