title: Electric-field-induced polar biaxial order in a nontilted smectic phase of an asymmetric bent-core liquid crystal.
abstract: A polarization reorientation process has been studied by means of optical second-harmonic generation in an optically uniaxial smectic phase of an asymmetric bent-core liquid crystal. A nontilted polar smectic order with a biaxial order is induced by applying an electric field to the uniaxial nonpolar smectic phase. This phenomenon was well simulated by the two-dimensional Langevin process, i.e., electric-field-induced continuous molecular reorientation against thermal agitation. The simulation suggests that about 200s of molecules form a polar domain and cooperatively respond to the applied field. The existence of the polar domains and their reorientation are consistent to the dielectric measurement; a high dielectric constant of about 60 at the kHz range is markedly suppressed by applying a bias field.
authors.affiliation: Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1, O-okayama, Meguro-ku, Tokyo 152-8552, Japan.
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Shimbo
authors.forename: Ewa
authors.initials: E
authors.lastname: Gorecka
authors.forename: Damian
authors.initials: D
authors.lastname: Pociecha
authors.forename: Fumito
authors.initials: F
authors.lastname: Araoka
authors.forename: Masanao
authors.initials: M
authors.lastname: Goto
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Takanishi
authors.forename: Ken
authors.initials: K
authors.lastname: Ishikawa
authors.forename: Jozef
authors.initials: J
authors.lastname: Mieczkowski
authors.forename: Kinga
authors.initials: K
authors.lastname: Gomola
authors.forename: Hideo
authors.initials: H
authors.lastname: Takezoe