LIGHT-SCATTERING STUDY OF FREEDERICKSZ TRANSITIONS IN NEMATIC LIQUID-CRYSTALS

被引：8

作者：

GALATOLA, P ^{[1
]}

机构：

[1] POLITECN TORINO, CONSORZIO INTERUNIV NAZL FIS MAT, I-10128 TURIN, ITALY

来源：

JOURNAL DE PHYSIQUE II | 1992年 / 2卷 / 11期

关键词：

D O I：

10.1051/jp2:1992247

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

We introduce a novel technique to study the static distortion of a nematic liquid crystal in the neighbourhood of a Freedericksz transition, based on the analysis of the power spectral density of quasi-elastic light-scattering. Under suitable conditions the symmetry breaking of the director profile due to the Freedericksz transition induces a. similar symmetry breaking in the angular dependence of the power spectral density, thus allowing a precise determination of the critical field. Experimental results are shown for the case of splay (twist) transition induced by an electric (magnetic) field. The correlation of the scattered fields at different angles is analyzed.

引用

页码：1995 / 2010

页数：16

共 36 条

[1] NOISE OF THE LIGHT SCATTERED BY A NEMATIC LIQUID-CRYSTAL NEAR THE FREEDERICKSZ TRANSITION [J].

ALLIA, P ;

OLDANO, C ;

VALABREGA, PT ;

TROSSI, L .

PHYSICA SCRIPTA, 1991, 44 (04) :388-390

[2]

ALLIA P, IN PRESS MOL CRYST L

[3]

Arakelyan S. M., 1984, Soviet Physics - Doklady, V29, P202

[4] BISTABILITY INDUCED BY CROSSED ELECTRIC AND MAGNETIC-FIELDS IN A NEMATIC FILM [J].

BARBERO, G ;

MIRALDI, E ;

OLDANO, C .

PHYSICAL REVIEW A, 1988, 38 (06) :3027-3034

[5] FLOW-MEASUREMENTS OF THE VISCOSITY COEFFICIENTS OF 2 NEMATIC LIQUID-CRYSTALLINE AZOXYBENZENES [J].

BEENS, WW ;

DEJEU, WH .

JOURNAL DE PHYSIQUE, 1983, 44 (02) :129-136

[6] THE FRANK CONSTANTS OF NEMATIC 5CB AT ATMOSPHERIC-PRESSURE [J].

BUNNING, JD ;

FABER, TE ;

SHERRELL, PL .

JOURNAL DE PHYSIQUE, 1981, 42 (08) :1175-1182

[7] NEW METHOD FOR MEASURING TWIST ELASTIC-CONSTANT K22-CHI-ALPHA AND SHEAR VISCOSITY GAMMA1-CHI-ALPHA FOR NEMATICS [J].

CLADIS, PE .

PHYSICAL REVIEW LETTERS, 1972, 28 (25) :1629-&

[8]

DEGENNES PG, 1974, PHYSICS LIQUID CRYST

[9] HYSTERESIS IN DEFORMATION OF NEMATIC LIQUID-CRYSTAL LAYERS WITH HOMEOTROPIC ORIENTATION [J].

DEULING, HJ ;

HELFRICH, W .

APPLIED PHYSICS LETTERS, 1974, 25 (03) :129-130

[10] DEFORMATION OF NEMATIC LIQUID-CRYSTALS IN AN ELECTRIC-FIELD [J].

DEULING, HJ .

MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 1972, 19 (02) :123-131

← 1 2 3 4 →