Page 11 - Photoreactive Organic Thin Films
P. 11

CONTENTS

              10 Photoassisted Poling and Photoswitching of NLO Properties of
                  Spiropyrans and Other Photochromic Molecules in Polymers
                  and Crystals
                 JACQUES A. DELAIRE, ELENA ISHOW, AND KEITARO NAKATANI

                  10.1 Introduction 306
                  10.2 Molecular Second-Order Nonlinear Optical Polarizabilities of
                       Photochromic Molecules 307
                       20.2.1 Definitions 307
                       10.2.2 Methods of Determining Molecular Hyperpolarizabiliti.es:
                              Experiments and Calculations 308
                       10.2.3 Influence of Photochromism on Molecular
                              Hyperpolarizabilities  311
                  10.3 Photoassisted Poling of Photochromes Other Than Azo Derivatives in
                       Polymers 315
                       103.1 Principle 315
                       10.3.2 Measurement Techniques 317
                       10.3.3 Examples 318
                       10.3.4 Applications 320
                  10.4 Photoswitching of NLO Properties in Organized Systems and
                       Materials 321
                       10.4.1 Introduction 321
                       10.4.2 Photoswitching in Polymers 321
                       10.4.3 Photoswitching of NLO Properties of Noncentrosymmetric
                              Photochromic Crystals 322
                       10.4.4 Potential Applications 324
                  10.5 Conclusion 326







               11 All Optical Poling in Polymers and Applications
                  ALEKSANDRAAPOSTOLUK, CELINE FIORINI-DEBUISSCHERT, AND
                 JEAN-MICHEL NUNZI
                  11.1 Standard Poling Techniques 332
                       11.1.1 Electric Field Poling (Corona Poling)  332
                       11.1.2 Photo-Assisted Electric Field Poling 333
                  11.2 All Optical Poling 334
                       11.2.1 Quasi-Permanent AII Optical Encoding of
                              Noncentrosymmetry 33 7
                       11.2.2 Relevant Parameters for an Efficient All Optical
                              Poling 340
                                                                 2)
                       11.2.3 Characterization of the Photoinduced %*  Susceptibility  347
                       11.2.4 Optimization of the Poling Efficiency  353
                       11.2.5 Perspectives 360
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