title: Magnetically tunable selective reflection of light by heliconical cholesterics.
abstract: We present studies of chiral nematic liquid crystals composed of flexible dimer molecules subject to large dc magnetic fields between 0 and 31 T. We observe that these fields lead to selective reflection of light depending on temperature and magnetic field. The band of reflected wavelengths can be tuned from ultraviolet to beyond the IR-C band. A similar effect induced by electric fields has been presented previously, and was explained by a field-induced oblique-heliconical director deformation in accordance with early theoretical predictions. The use of magnetic field here instead of electric field allows precise measurements of some material constants and holds promise for wireless tuning of selective reflection.
authors.affiliation: Chemical Physics Interdisciplinary Program & Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA.
authors.forename: S M
authors.initials: SM
authors.lastname: Salili
authors.affiliation: Chemical Physics Interdisciplinary Program & Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA.
authors.forename: J
authors.initials: J
authors.lastname: Xiang
authors.affiliation: Chemical Physics Interdisciplinary Program & Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA.
authors.forename: H
authors.initials: H
authors.lastname: Wang
authors.affiliation: Chemical Physics Interdisciplinary Program & Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA.
authors.forename: Q
authors.initials: Q
authors.lastname: Li
authors.affiliation: Department of Chemistry, University of Aberdeen, AB24 3UE Scotland, United Kingdom.
authors.forename: D A
authors.initials: DA
authors.lastname: Paterson
authors.affiliation: Department of Chemistry, University of Aberdeen, AB24 3UE Scotland, United Kingdom.
authors.forename: J M D
authors.initials: JM
authors.lastname: Storey
authors.affiliation: Department of Chemistry, University of Aberdeen, AB24 3UE Scotland, United Kingdom.
authors.forename: C T
authors.initials: CT
authors.lastname: Imrie
authors.affiliation: Chemical Physics Interdisciplinary Program & Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA.
authors.forename: O D
authors.initials: OD
authors.lastname: Lavrentovich
authors.affiliation: Department of Physics, Kent State University, Kent, Ohio 44242, USA.
authors.forename: S N
authors.initials: SN
authors.lastname: Sprunt
authors.affiliation: Department of Physics, Kent State University, Kent, Ohio 44242, USA.
authors.forename: J T
authors.initials: JT
authors.lastname: Gleeson
authors.affiliation: Chemical Physics Interdisciplinary Program & Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA.|Complex Fluid Group, Wigner Research Centre, Budapest, Hungary.
authors.forename: A
authors.initials: A
authors.lastname: Jákli