title: Competition of lattice and basis for alignment of nematic liquid crystals.
abstract: Due to elastic anisotropy, two-dimensional patterning of substrates can promote weak azimuthal alignment of adjacent nematic liquid crystals. Here we consider how such alignment can be achieved using a periodic square lattice of circular or elliptical motifs. In particular, we examine ways in which the lattice and motif can combine to favor differing orientations. Using Monte Carlo simulation and continuum elasticity we find, for circular motifs, that the coverage fraction controls both the polar anchoring angle and a transition in the azimuthal orientation. If the circles are generalized to ellipses, arbitrary control of the effective easy axis and effective anchoring potential becomes achievable by appropriate tuning of the ellipse motif relative to the periodic lattice patterning. This has possible applications in both monostable and bistable liquid crystal device contexts.
authors.affiliation: Department of Physics and Astronomy, Tufts University, 574 Boston Avenue, Medford, Massachusetts 02155, USA.
authors.forename: Andrew
authors.initials: A
authors.lastname: DeBenedictis
authors.affiliation: Department of Physics and Astronomy, Tufts University, 574 Boston Avenue, Medford, Massachusetts 02155, USA.
authors.forename: Timothy J
authors.initials: TJ
authors.lastname: Atherton
authors.affiliation: Materials and Engineering Research Institute, Sheffield Hallam University, City Campus, Howard Street, Sheffield S1 1WB, United Kingdom.
authors.forename: Candy
authors.initials: C
authors.lastname: Anquetil-Deck
authors.affiliation: Materials and Engineering Research Institute, Sheffield Hallam University, City Campus, Howard Street, Sheffield S1 1WB, United Kingdom.
authors.forename: Douglas J
authors.initials: DJ
authors.lastname: Cleaver
authors.affiliation: Department of Mathematics, Tufts University, 503 Boston Avenue, Medford, Massachusetts 02155, USA.
authors.forename: David B
authors.initials: DB
authors.lastname: Emerson
authors.affiliation: Department of Mathematics, Tufts University, 503 Boston Avenue, Medford, Massachusetts 02155, USA.
authors.forename: Mathew
authors.initials: M
authors.lastname: Wolak
authors.affiliation: Department of Mathematics, Tufts University, 503 Boston Avenue, Medford, Massachusetts 02155, USA.
authors.forename: James H
authors.initials: JH
authors.lastname: Adler