Poling Dynamics of Nonlinear Optical Guest-host Polymer Systems PDF Download
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Author: Chi Wing To
Publisher:
ISBN:
Category : Polymers
Languages : en
Pages : 208
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Author: Chi Wing To
Publisher:
ISBN:
Category : Polymers
Languages : en
Pages : 208
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Author: Sung-chun Chan
Publisher:
ISBN:
Category : Nonlinear optics
Languages : en
Pages : 218
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 26
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Hawaiʻi - Authors - Books - Deborah Iida.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 38
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Book Description
The behaviour of surface and trapped charges that originate during contact electric-field poling of a model guest-host nonlinearly active polymer has been investigated. Charge effects in this films of para-nitroaniline doped polymethylmethacrylate were studied during and after the poling process by simultaneous measurement of the current through the poling circuit and the SHG signal from the polymer system. The poling current present in a fresh sample is found to differ in both magnitude and temporal dependence to that observed in the sample during subsequent polings. These effects are interpreted by the initial presence of ionic impurities in the sample and the injection of charge into the polymer matrix during poling. The magnitude of the steady-state current eventually reached during the poling process is found to depend on temperature and is related to the mobility of charges. A sharp drop-off in SHG signal intensity that occurs when the poling electrodes are grounded is shown to result from the removal of surface charge that orients chromophore dipoles near the surface of the film; the decay in the macroscopic polarization that then occurs is prolonged by charges trapped in the polymer matrix. The build-up of trapped charge explains a memory effect in which the SHG signal relaxation time gradually increases as the polymer is subjected to multiple polings until a steady-state value is reached. Finally, it is demonstrated that the charges trapped in the polymer matrix are released only after the polymer is heated to high above it temperature of glass transition and the SHG signal has completely decayed away. (MM).
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 1
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Author: Manthos G. Papadopoulos
Publisher: Springer Science & Business Media
ISBN: 1402048505
Category : Science
Languages : en
Pages : 676
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Book Description
This book assembles both theory and application in this field, to interest experimentalists and theoreticians alike. Part 1 is concerned with the theory and computing of non-linear optical (NLO) properties while Part 2 reviews the latest developments in experimentation. This book will be invaluable to researchers and students in academia and industry, particularlrly to anyone involved in materials science, theoretical and computational chemistry, chemical physics, and molecular physics.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
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An easily processable photocrosslinking guest-host system with stable second order nonlinear optical properties using polyvinylcinnamate as a host polymer has been developed. Samples were made as free standing films from photo-crosslinkable polyvinylcinnamate and different concentration levels of 3-cinnamoyloxy-4-4-(N, N'-diethylamino)-2-cinnamoyloxy phenyl azo nitrobenzene. Photo-crosslinking was carried out by ultraviolet radiation at the major wavelengths viz. 297 and 313 nm subsequent to corona poling. Dynamic mechanical properties of these polymer films were investigated. The changes in the storage and loss moduli, as well as relaxation behavior of the system upon crosslinking and poling are discussed.
Author: Henry Norris Russell
Publisher:
ISBN:
Category : Spectrum analysis
Languages : en
Pages : 30
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Author:
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ISBN:
Category :
Languages : en
Pages : 35
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The goals of the research are two fold; First, determine the internal electric field effects from studies of charge magnitude, symmetry and distribution in dye-doped polymer systems. Second, a better understanding of the electric field effects on the chromophore mobility during and after poling. To this end, several techniques are being employed. Electrochromism technique is being used to determine the charge magnitude inside film samples. The films are 4-dimethylamino-4'-nitrostilbene and disperse red 1 chromophores doped into poly(Methyl methacrylate) guest-host systems. Charge symmetry is also being studies using thermal pulse experiments. Preliminary result show that the charges are distributed linearly in the sample. More tests will be performed in search of any local charge distribution inhomogeneities. An interferometric technique with in-situ poling was used to probe the poling field- induced molecular alignment of the chromophores as a function of temperature. Results are showing the dependence of poling on electric fields (magnitude and polarity). Integrated systems will further reveal the loses in the films due to the field Dependent chromophore orientation.
Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 994
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