Page 8 - Photoreactive Organic Thin Films

CONTENTS yii

•!• PHQTOISOMERIZATIQN IN ORGANIC THIN FILMS

4 Photoisomerization and Photo-Orientation of Azo Dye in Films
of Polymer: Molecular Interaction, Free Volume, and Polymer
Structural Effects
ZOUHEIR SEKKAT AND WOLFGANG KNOLL

4.1 Introduction 108
4.2 Photoisomerization of Azobenzenes in Molecularly Thin Self-Assembled
Monolayers: Photo-Orientation and Photo-Modulation of the Optical
Thickness 110
4.2.1 Pbotoisomerization of Azo-SAMs 110
4.2.2 Photo-Orientation in Molecularly Thin Layers (Smart
Monolayers) 111
4.2.3 Photo-Modulation of the Optical Thickness of Molecularly Thin
Layers 114
4.3 Photoisomerization and Photo-Orientation of Azobenzenes in
Supramolecular Assemblies: Photo-Control of the Structural and Optical
Properties of Langmuir-Blodgett-Kuhn Multilayers of Hairy-Rod
Azo-Polyglutamates 117
4.4 Polymer Structural Effects on Photo-Orientation 122
4.4.1 Photoisomerization and Photo-Orientation of High-Temperature
Azo-Polyimides 123
4.4.2 Photoisomerization and Photo-Orientation of the Flexible
Azo-Polyur ethanes 128
4.5 Pressure Effects on Photoisomerization and Photo-Orientation 134
4.6 Conclusion 140

5 Chiral Polymers with Photoaffected Phase Behavior for Optical
Data Storage
MIKHAILV. KOZLOVSKY, LEV M. BLINOV, AND W. HAASE
5.1 Introduction 145
5.2 Amorphous, Optically Isotropic Mesophase of Chiral Side-Chain
Polymers with a Hidden Layer Structure—The "Isotropic Smectic"
Phase 148
5.3 Photoinduced Birefringence in Photochromic IsoSm*
Copolymers 152
5.4 Holographic Grating Recording 160
5.5 Photoinduced Alignment of Low Molar Mass Liquid Crystals 166
5.6 Photoaffected Phase Behavior and the LCPT Photorecording 168
5.7 Conclusions 172