TY - JOUR
T1 - Prewavy pattern
T2 - A director-modulation structure in nematic liquid crystals
AU - Huh, Jong Hoon
AU - Hidaka, Yoshiki
AU - Yusuf, Yusril
AU - Éber, Nándor
AU - Tóth-Katona, Tibor
AU - Buka, Ágnes
AU - Kai, Shoichi
N1 - Funding Information:
This work has been done as a part of a Japanese-Hungarian cooperative research project between JSPS and HAS. A. B., 8. N. and T. T.-K. ac- knowledge the kind hospitality of the Kyushu University. We would like to thank W. Pesch, A. G. Rossberg and L. Kramer for useful discussions and comments. This work has been partiaUy supported by a Grant in-Aid for Scientific Research from the Ministry of Education, Sports, Science and Culture in Japan (Nos. 10440117 and 12740238), and by Hungarian Research Grants OTKA TO3 1808, TO22772 and F022771.
PY - 2001
Y1 - 2001
N2 - A periodic structure (the prewavy pattern) found below the onset of electroconvection in a homeotropically aligned nematic liquid crystal is reported. It is characterized by a periodic modulation of the director in the xy-plane, which can be distinguished from electroconvection patterns with modulation in the xz-plane. The prewavy instability is investigated in detail; a phase diagram in the frequency-voltage plane, the voltage dependence of the azimuthal rotation angle, the voltage and frequency dependence of the wavelength of the prewavy pattern, and the director field in the prewavy pattern are provided. This prewavy pattern always evolves into the so-called chevrons above onset of convection. The wavelength of the chevrons and the orientation of their alternating zig and zag rolls depend on the director structure of the prewavy pattern.
AB - A periodic structure (the prewavy pattern) found below the onset of electroconvection in a homeotropically aligned nematic liquid crystal is reported. It is characterized by a periodic modulation of the director in the xy-plane, which can be distinguished from electroconvection patterns with modulation in the xz-plane. The prewavy instability is investigated in detail; a phase diagram in the frequency-voltage plane, the voltage dependence of the azimuthal rotation angle, the voltage and frequency dependence of the wavelength of the prewavy pattern, and the director field in the prewavy pattern are provided. This prewavy pattern always evolves into the so-called chevrons above onset of convection. The wavelength of the chevrons and the orientation of their alternating zig and zag rolls depend on the director structure of the prewavy pattern.
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U2 - 10.1080/10587250108024981
DO - 10.1080/10587250108024981
M3 - Article
AN - SCOPUS:0012044818
SN - 1058-725X
VL - 364
SP - 111
EP - 122
JO - Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
JF - Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
ER -