Photoinduced Modifications of the Nonlinear Optical Response in Liquid Crystalline Azopolymers

• Κύριος συγγραφέας: Alicante, Raquel (Συγγραφέας)
• Συγγραφή απο Οργανισμό/Αρχή: SpringerLink (Online service)
• Μορφή: Ηλεκτρονική πηγή Ηλ. βιβλίο
• Γλώσσα: English
• Έκδοση: Berlin, Heidelberg : Springer Berlin Heidelberg : Imprint: Springer, 2013.
• Σειρά: Springer Theses, Recognizing Outstanding Ph.D. Research,
• Θέματα: Physics.; Amorphous substances.; Complex fluids.; Surfaces (Physics).; Interfaces (Physical sciences).; Thin films.; Lasers.; Photonics.; Optical materials.; Electronic materials.; Materials > Surfaces.; Laser Technology, Photonics.; Optical and Electronic Materials.; Surface and Interface Science, Thin Films.; Soft and Granular Matter, Complex Fluids and Microfluidics.; Surfaces and Interfaces, Thin Films.

 Nonlinear optical (NLO) phenomena such as frequency conversion have played a key role in the development of photonic technologies. This thesis reports a detailed study of the molecular response of a large variety of push-pull organic compounds using the Second Harmonic Generation technique, which will serve as a starting point for the investigation at the macroscopic scale of azobenzene-based liquid crystalline polymeric films and their blends with highly efficient NLO chromophores. These materials are designed with the aim of exploiting their photo-addressability in order to tailor their nonlinear behaviour. The magnitude and symmetry of their nonlinear response was successfully controlled via light irradiation and thermal treatments. Moreover, as a specific application, the recording of efficient NLO gratings was achieved and is described here. 

 Introduction and Basic Theory -- Experimental Methods.- Nonlinear Optical Molecular Response -- Piperazine Azopolymer Thin Films -- Films of Doped Low Polar Azopolymers -- Nonlinear Optical Gratings -- General Conclusions -- Appendices.