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The Use of Electron Diffraction and High Resolution Imaging to Explain why the Non-Dipolar Molecules of l,3,5-Triamino-2,4,6-Trinitrobenzene Display Strong Powder Second Hamonic Generation Efficiency.

Published online by Cambridge University Press:  02 July 2020

Ingrid G. Voigt-Martin ,
Gao Li  and
A. Yakimanski
Ingrid G. Voigt-Martin
Affiliation:
Institut für Physikalische Chemie der Universität Mainz, Jakob Weider Weg 11, D 55099Mainz
Gao Li
Affiliation:
Institut für Physikalische Chemie der Universität Mainz, Jakob Weider Weg 11, D 55099Mainz
A. Yakimanski
Affiliation:
Institut für Physikalische Chemie der Universität Mainz, Jakob Weider Weg 11, D 55099Mainz
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Extract

The exploration of light for applications in optical integrated devices has received world wide attention during the past decade.Organic compounds are of interest because of their large hyperpolarisabilities β and fast response times as well as offering many diferent types of processing geometry. It has been generally understood in the past that the requirements which must be satisfied by the microscopic system (i.e.the molecule) in order for the macroscopic system (i.e. the crystal ) to display second harmonic generation are the following: (a) the molecule must have a dipole moment μ (b) the molecule must have large components of hyperpolarisability β (c) the molecules must adopt a mutual orientation in the unit cell which avoids centro-symmetry .

In practice, TATB was found to have a very large optical susceptibility,although it did not satisfy conditions (a) and (c). With regard to condition (c), it was suggested that structural defects might explain the appearance of second harmonic generation in a centro-symmetric crystal. For this reason we decided to re-examine the problem using electron microscopy and diffraction.

Type
Electron Crystallography; the Electron Phase Problem
Information
Microscopy and Microanalysis , Volume 3 , Issue S2: Proceedings: Microscopy & Microanalysis '97, Microscopy Society of America 55th Annual Meeting, Microbeam Analysis Society 31st Annual Meeting, Histochemical Society 48th Annual Meeting, Cleveland, Ohio, August 10-14, 1997 , August 1997 , pp. 1061 - 1062
Copyright
Copyright © Microscopy Society of America 1997

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References

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