Kimura Y, Hara S, Hayakawa R
Department of Applied Physics, Graduate School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-Ku, Tokyo 113-8656, Japan.
Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics. 2000 Nov;62(5 Pt A):R5907-10. doi: 10.1103/physreve.62.r5907.
The nonlinear dielectric relaxation spectra of ferroelectric liquid crystals (FLCs) have been studied in the chiral smectic-C phase. The linear and third-order nonlinear dielectric spectra show the relaxation corresponding to the fluctuation in the azimuthal angle of directors called the Goldstone mode. We calculated the nonlinear dielectric spectra of the Goldstone mode theoretically by the torque balance equation which describes the dynamics of FLCs under the electric field. The calculated spectra make good agreement with the measured ones. We also evaluated the material constants of FLCs from the best-fitted values of the linear and nonlinear dielectric increment and relaxation time.
铁电液晶（FLC）的非线性介电弛豫谱已在手性近晶C相进行了研究。线性和三阶非线性介电谱显示出与指向矢方位角波动相对应的弛豫，即戈德斯通模。我们通过描述电场作用下FLC动力学的转矩平衡方程从理论上计算了戈德斯通模的非线性介电谱。计算得到的谱与测量值吻合良好。我们还根据线性和非线性介电增量及弛豫时间的最佳拟合值评估了FLC的材料常数。
