Linear optical anisotropy

Linear Optical Anisotropy in Aromatic Polyimide Films and Its Applications in Negative Birefrii ent Compensators of Liquid-Crystal Displays... 

LI ET AL. Linear Optical Anisotropy in Aromatic PolyinUde Films... 

Chemical Backbone Structure Effect on Linear Optical Anisotropy... 

LI ETAL. linear Optical Anisotropy in Aromatic Polyinade Films 7... 

Non-centrosymmetric Y-type LB films of DCANP can easily be prepared in a thickness more than sufficient for optical waveguiding. Their non-linear optical susceptibility in transmission is approximately 25% of that of LiNbOs and there is no phase mismatch, up to a thickness of 270 bilayers. Multilayers show a strong optical and non-linear optical anisotropy with respect to the dipping direction, which is a consequence of the transfer process. 

Before being able to study the nonlinear optical properties of any material, it is necessary to have a complete understanding of its linear optical properties. Therefore, we start this section with a brief discussion of the techniques used to measure some of the most important linear properties, e.g., linear absorption, fluorescence, anisotropy, and fluorescence quantum yield. 

Analogous to the definitions of linear birefringence and linear dichroism following equations (2.15) and (2.21), the form of equation (2.30) suggests the following optical anisotropies for circularly polarized light ... 

Electro- and magnetooptical phenomena in colloids and suspensions are widely used for structure and kinetics analysis of those media as well as practical applications in optoelectronics [143,144]. The basic theoretical model used to study optical anisotropy of the disperse systems is the noninteracting Brownian particle ensemble. In the frame of this general approximation, several special cases according to the actual type of particle polarization response to the applied field may be distinguished (1) particles with permanent dipole moments, (2) linearly polarizable particles, (3) nonlinearly polarizable particles, and (4) particles with hysteretic dipole moment reorientation. 

In 1875 John Kerr carried out experiments on glass and detected electric-field-induced optical anisotropy. A quadratic dependence of n on E0 is now known as the Kerr effect. In 1883 both Wilhelm Rontgen and August Kundt independently reported a linear electro-optic effect in quartz which was analysed by Pockels in 1893. The linear electro-optical effect is termed the Pockels effect. 

The constant (200b) is highly characteristic in that its sign depends on the sign of the optical anisotropy (<% — a,) of the molecule, which is negative in planar molecules of the type QHs but positive in linear ones, e.g. CS2. The ratio of the constants (200b) and (177b) is, in the present approximation,... 

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