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Relaxation Of Polar Orientational Order In Nonlinear Optical Polymers By Second Harmonic Generation
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Book Synopsis Relaxation of Polar Orientational Order in Nonlinear Optical Polymers by Second Harmonic Generation by :
Download or read book Relaxation of Polar Orientational Order in Nonlinear Optical Polymers by Second Harmonic Generation written by and published by . This book was released on 1993 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation of the decay of the second harmonic generation (SHG) signals from a main chain accordion and a guest/host nonlinear optical (NLO) polymer has been carried out. The shape of the decay of the SHG signal from the main chain polymer is stretched exponential with the width parameter, B, increasing with increasing, temperature. The increase in B indicates a narrowing of the distribution of relaxation times. On the other hand, the SHG decay signal from the guest/host system is found to be better described by the sum of two single exponential functions with the first short time component affected strongly by the surface change effect and the second slow component associated with the relaxation of the macroscopic polarization. The time constant of the slow component is found to be successively increasing with the poling-decay cycle and it reaches a steady state value after several cycles. The relaxation time lengthening effect is obtained both above and below T(sub g); however, the effect rapidly diminishes as the temperature is increased above T(sub g). The temperature dependence of the steady state relaxation time is not Arrhenius; the Vogel-Fulcher-Tamann equation gives a satisfactory fit to the temperature dependence data.
Book Synopsis Polar Order and Relaxation of Second Order Nonlinear Optical Susceptibility in an Electric Field Polarized Amorphous Polymer by :
Download or read book Polar Order and Relaxation of Second Order Nonlinear Optical Susceptibility in an Electric Field Polarized Amorphous Polymer written by and published by . This book was released on 1993 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dependence of the second harmonic generation (SHG) signal of an amorphous polymer system containing nonlinear optical (NLO) chromophores on the polarizing electric field is investigated. It is shown that under a weak poling field condition, the SHG intensity is proportional to E sub p2, provided that the polarizing electric field E sub p is greater than a threshold field, E sub s. Above E sub s the macroscopic polar orientational order is established. The lengthening of the relaxation time for polar orientational order with increasing E sub p is also observed. Theoretical analysis shows that the relaxation time is proportional to the polar order initially induced by the polarizing field. Experiments have been carried out to confirm the theoretical prediction.
Book Synopsis Orientational Pair Correlation, Polar Order Parameter and Temporal Stability in the Second Harmonic Generation of Amorphous Polymers by :
Download or read book Orientational Pair Correlation, Polar Order Parameter and Temporal Stability in the Second Harmonic Generation of Amorphous Polymers written by and published by . This book was released on 1993 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of the second harmonic generation (SHG) signal were made on the DAN/PMMA guest/host system as a function of the nonlinear optical (NLO) chromophore concentration and the poling field strength. The temporal stability of the SHG signal, after the poling field was removed, was also investigated. The polar orientational order parameters, L(sub 33) and L(sub 31) (see text for definition), were deduced from the second order nonlinear susceptibility. Both of the polar orientational order parameters and the relaxation time of the nonlinear susceptibility were found to increase with increasing NLO chromophore concentration. The concentration dependence was interpreted as due to the anisotropic intermolecular interaction, particularly the dipole-dipole interaction. The anisotropic intermolecular interaction introduces the orientational pair correlation function which enhances the polar order as well as the temporal stability of the NLO effect.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cinderella Writer written by and published by . This book was released on 1996 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hawaiʻi - Authors - Books - Deborah Iida.
Book Synopsis Polymers for Second-order Nonlinear Optics by : Geoffrey A. Lindsay
Download or read book Polymers for Second-order Nonlinear Optics written by Geoffrey A. Lindsay and published by . This book was released on 1995 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents the most recent developments in second-order nonlinear optical polymers. Covers the most important technologies necessary to achieve commercially viable devices based on special polymeric materials with second-order nonlinear optical properties. Discusses important molecular design considerations, how to process the polymers into films, the stability of the films, their optical properties, and prototype devices that can be made from these films.
Book Synopsis Dipolar Orientational Relaxation in Guest/Host Amorphous Polymer Probed by Second Harmonic Generation by :
Download or read book Dipolar Orientational Relaxation in Guest/Host Amorphous Polymer Probed by Second Harmonic Generation written by and published by . This book was released on 1993 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: The decay of the second harmonic signal of a nonlinear optical chromophore dispersed in an amorphous polymer matrix is investigated. The decay curve can be fit either to the Kohrausch-Williams-Watts (KWW) stretched exponential function or to a bi-exponential function. The bi-exponential fit gives a better description of the decay of the second order nonlinear optical susceptibility of the contact electrode poled amorphous NLO polymer film. The fast decay component of the relaxation curve is attributed to the combined effect of reorientation of NLO dipole and the third order optical nonlinearity. The slow decay is due to the rotational diffusion of the NLO dipole. The temperature dependence of the rotational relaxation time is found to follow the Vogel-Fulcher-Tamman equation.
Book Synopsis Frontal Polymer Research by : Robert K. Bregg
Download or read book Frontal Polymer Research written by Robert K. Bregg and published by Nova Publishers. This book was released on 2006 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymers are substances containing a large number of structural units joined by the same type of linkage. These substances often form into a chain-like structure. Starch, cellulose, and rubber all possess polymeric properties. Today, the polymer industry has grown to be larger than the aluminium, copper and steel industries combined. Polymers already have a range of applications that far exceeds that of any other class of material available to man. Current applications extend from adhesives, coatings, foams, and packaging materials to textile and industrial fibres, elastomers, and structural plastics. Polymers are also used for most composites, electronic devices, biomedical devices, optical devices, and precursors for many newly developed high-tech ceramics. This new book presents leading-edge research in this rapidly-changing and evolving field.
Book Synopsis Polymers in Telecommunication Devices by : G. H. Cross
Download or read book Polymers in Telecommunication Devices written by G. H. Cross and published by iSmithers Rapra Publishing. This book was released on 2002 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report discusses the use of the use of polymers instead of and in conjunction with, traditional platforms such as indium phosphide and ferroelectric ceramic lithium niobate. Critical comparisons are made between use of polymers and alternative. This review report gives an overview of all the elements of optical transmission and switching systems that are used in telecommunications and is a fully interdisciplinary account of materials and device design issues. An additional indexed section containing several hundred abstracts from the Rapra Polymer Library database gives useful references for further reading.
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1994-12 with total page 1302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1994 with total page 1754 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Mirosław A. Karpierz Publisher :SPIE-International Society for Optical Engineering ISBN 13 : Total Pages :426 pages Book Rating :4.3/5 (91 download)
Book Synopsis Nonlinear Optics Applications by : Mirosław A. Karpierz
Download or read book Nonlinear Optics Applications written by Mirosław A. Karpierz and published by SPIE-International Society for Optical Engineering. This book was released on 2005 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of SPIE present the original research papers presented at SPIE conferences and other high-quality conferences in the broad-ranging fields of optics and photonics. These books provide prompt access to the latest innovations in research and technology in their respective fields. Proceedings of SPIE are among the most cited references in patent literature.
Book Synopsis Isothermal Annealing and Relaxation of the Second Harmonic Generation Signal from a Nonlinear Optical Polymer by :
Download or read book Isothermal Annealing and Relaxation of the Second Harmonic Generation Signal from a Nonlinear Optical Polymer written by and published by . This book was released on 1993 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of the first detailed study of the effect of isothermal annealing on the relaxation behavior of the second harmonic generation signal below Tg of nonlinear optical (NLO) polymers are presented. Lengthening of the NLO chromophore relaxation time by isothermal poling suggests a strategy for preparing a stable NLO material.
Book Synopsis Relaxation Studies and Molecular Design of Second Order Nonlinear Optical Polymers by : Sutiyao Marturunkakul
Download or read book Relaxation Studies and Molecular Design of Second Order Nonlinear Optical Polymers written by Sutiyao Marturunkakul and published by . This book was released on 1993 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Photoreactive Organic Thin Films by : Zouheir Sekkat
Download or read book Photoreactive Organic Thin Films written by Zouheir Sekkat and published by Elsevier. This book was released on 2002-12-07 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wolfgang Knoll is a former Directory of Polymer research at the Max Planck Institute. He is extremely well know for his research in this area. Zouheir Sekkat was a Postdoctoral researcher at Max Planck working under Professor Knoll. With Knoll's involvement, we can be confident that the best people in this field will be contributing to the reference.
Book Synopsis Polymers for Photonics Applications II by : Kwang-Sup Lee
Download or read book Polymers for Photonics Applications II written by Kwang-Sup Lee and published by Springer Science & Business Media. This book was released on 2003-03-05 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: The future of information technology requires ultra high speed processing and large data storage capacity. Since the electronics technology using semi conduc tors and inorganic materials is about to reach its limits, much current research is focused on utilizing much faster photons than electrons, namely photonics. To achieve any significant effect on the actual use of the science of photonics, devel opments of more efficient photonics materials, better optical property evaluations, manufacture of devices for system applications, etc. are the subjects which need to be explored. In particular, the development of photonics materials stands in the forefront of research as this constitutes the most pertinent factor with regard to the development of ultra high speed and large capacity information processing. In this respect, there has been continuous research on photo responsive materials through molecular structure design and architecture and the results so far are very promising as functions and performances are beginning to realize their high expectations. The two special volumes "Polymers for Photonics Applications" give authorita tive and critical reviews on up to date activities in various fields of photonic poly mers including their promising applications. Seven articles have been contributed by internationally recognized and they deal with, polymers for second and third order nonlinear optics, quadratic parametric interactions in polymer waveguides, electroluminescent polymers as light sources, photoreflective polymers for holo graphic information storage, and highly efficient two photon absorbing organics and polymers.
Book Synopsis Thin Films for Integrated Optics Applications: Volume 392 by : Bruce W. Wessels
Download or read book Thin Films for Integrated Optics Applications: Volume 392 written by Bruce W. Wessels and published by . This book was released on 1995-10-19 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: The combination of electro-optic (EO) thin films with silicon-integrated circuits provides a promising approach to creating optoelectronic integrated circuits (OEICs) capable of sending information at data rates greater than 1 Gbit/second with low power consumption. These devices are of two basic types - very highly parallel (64K channels or greater) or very high speed (Gbits/ second/channel). Materials scientists, chemists and physicists come together in this new volume to discuss EO thin-film materials and devices, and to learn about advances in fields outside of their specific areas. Electro-optic materials featured include organic polymers and/or multilayers, liquid crystals, and inorganic thin films. Materials design, processing, and device issues are addressed. Topics include: nonlinear organics; liquid crystals for integrated optics; ferroelectric thin films; Er-doped inorganic thin films; inorganic thin film waveguides.
