Second and Fourth Harmonic Frequencies in Electric Field-Induced Liquid Crystal Reorientations

Abstract

The second and fourth harmonics of low frequency electric field-induced liquid crystal reorientations are analyzed theoretically and confirming results observed experimentally. These transient dynamic optical responses manifest when the phase of a homogeneous cell is nearby Np or ðN À 1 2 Þp, where N is an integer. These ripples would influence the grayscales of liquid crystal devices if the driving electric field frequency is comparable to the liquid crystal response rate.

Synthesis and Nonlinear Optical Properties of Novel Y-type Polyester Containing Nitrophenylazoresorcinoxy Group

“…Recently nonlinear optical (NLO) materials are extensively studied because of their potential applications in the field of electro-optic devices, including high speed optical modulators and ultrafast optical switches [1][2][3]. In the developments of NLO polymers for electro-optic device applications, stabilization of electrically induced dipole alignment is one of important criteria [4]; in this context, two approaches to minimize the randomization have been proposed namely the use of cross-linking method [5] and the utilizing high glass-transition temperature (T g ) polymers such as polyimides [6].…”