Intrinsic ionic screening of the ferroelectric polarization of KTP revealed by second-harmonic generation microscopy | Zendy

Mario Maglione | Zendy; Anand Theerthan | Zendy; Vincent Rodriguez | Zendy; Alexandra Peña | Zendy; Carlota Canalias | Zendy; Bertrand Ménaert | Zendy; Benoı̂t Boulanger | Zendy

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Intrinsic ionic screening of the ferroelectric polarization of KTP revealed by second-harmonic generation microscopy

Author(s) -

Mario Maglione,

Anand Theerthan,

Vincent Rodriguez,

Alexandra Peña,

Carlota Canalias,

Bertrand Ménaert,

Benoı̂t Boulanger

Publication year - 2015

Publication title -

optical materials express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.925

H-Index - 66

ISSN - 2159-3930

DOI - 10.1364/ome.6.000137

Subject(s) - ferroelectricity , second harmonic generation , ionic bonding , materials science , dipole , polarization (electrochemistry) , condensed matter physics , ion , piezoresponse force microscopy , space charge , screening effect , optics , optoelectronics , chemical physics , dielectric , chemistry , physics , electron , laser , organic chemistry , quantum mechanics

10 pages, 5 figuresInternational audienceMobile charges and lattice polarization interact in ferroelectric materials because of the Coulomb interaction between the mobile free charges and the fixed lattice dipoles. We have investigated this mutual screening in KTiOPO4, a ferroelectric/superionic single crystal in which the mobile charges are K+ ions. The ionic accumulation close to the crystal surfaces leads to orders of magnitude increase of the Second Harmonic Generation. This ionic space charge model is supported by the absence of such an effect in non-ionic conductor but ferroelectric BaTiO3, by its temperature dependence in KTiOPO4 and by its broad depletion at domain walls

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