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Molecular crystals

  • R. T. Bailey
  • F. R. Cruickshank
  • P. J. Halfpenny
  • D. Pugh
  • J. N. Sherwood
  • G. S. Simpson
Chapter

Abstract

The special feature of molecular crystals that distinguishes them from ionic materials or semiconductors is that the constituent molecules retain most of their identity. A knowledge of the molecular properties, combined with crystallographic data specifying the orientation of the molecules in the crystal lattice, should therefore provide a basis for understanding the optical properties of the crystal. Molecular quantum theory, confirmed by measurements on well-separated molecules in vapours or dilute solution, provides a reasonably accurate guide to the strength of the molecular nonlinearities, and many molecules have now been synthesized specifically for the purpose of investigating their potentially powerful nonlinear properties. The prediction of crystal structure, which would also be necessary if materials for nonlinear optics applications were to be designed completely from theory, is not at present possible, although certain general guiding principles are useful in creating molecular structures that are likely to crystallize in the non-centrosymmetric forms required for second-order materials (Zyss and Chemla, 1987).

Keywords

Nonlinear Optical Property Molecular Crystal Organic Crystal Nonlinear Optical Material Zone Refining 
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© Springer Science+Business Media Dordrecht 1993

Authors and Affiliations

  • R. T. Bailey
  • F. R. Cruickshank
  • P. J. Halfpenny
  • D. Pugh
  • J. N. Sherwood
  • G. S. Simpson

There are no affiliations available

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