Reference : High-contrast imaging of 180 degrees ferroelectric domains by optical microscopy usin...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Physics and Materials Science
http://hdl.handle.net/10993/45523
High-contrast imaging of 180 degrees ferroelectric domains by optical microscopy using ferroelectric liquid crystals
English
Nataf, Guillaume F. [Univ Cambridge, Dept Mat Sci, 27 Charles Babbage Rd, Cambridge CB3 OFS, England.]
Guennou, Mael mailto [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)]
Scalia, Giusy mailto [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)]
Moya, Xavier [Univ Cambridge, Dept Mat Sci, 27 Charles Babbage Rd, Cambridge CB3 OFS, England.]
Wilkinson, Tim D. [Univ Cambridge, Ctr Mol Mat Photon & Elect, Dept Engn, Elect Engn Div, 9 JJ Thomson Ave, Cambridge CB3 OFA, England.]
Lagerwall, Jan mailto [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)]
2020
APPLIED PHYSICS LETTERS
Amer Inst Physics
116
21
Yes (verified by ORBilu)
International
0003-6951
Melville
[en] Ferroelectric liquid crystals (FLCs) couple the direction of their spontaneous electric polarization to the direction of tilt of their optic axis. Consequently, reversal of the electric polarization by an electric field gives rise to an immediate and lasting optical response when an appropriately aligned FLC is observed between crossed polarizers, with one field direction yielding a dark image and the opposite direction yielding a bright image. Here, this peculiar electro-optic response is used to image, with high optical contrast, 180 degrees ferroelectric domains in a crystalline substrate of magnesium-doped lithium niobate. The lithium niobate substrate contains a few domains with upward electric polarization surrounded by regions with downward electric polarization. In contrast to a reference non-chiral liquid crystal that is unable to show ferroelectric behavior due to its high symmetry, the FLC, which is used as a thin film confined between the lithium niobate substrate and an inert aligning substrate, reveals ferroelectric domains as well as their boundaries, with strong black and white contrast. The results show that FLCs can be used for non-destructive readout of domains in underlying ferroelectrics, with potential applications in, e.g., photonic devices and non-volatile ferroelectric memories.
Royal Commission for the Exhibition of 1851 ; Royal SocietyRoyal Society of London
http://hdl.handle.net/10993/45523
10.1063/5.0008845
G.F.N. would like to thank the Royal Commission for the Exhibition of 1851 for the award of a Research Fellowship. X.M. is grateful for support from the Royal Society.

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