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Descriptive Chemistry Of Self-Assembled Multilayer Second-Order NLO Materials. Chemical, Microstructural and Performance Interrelationships

Published online by Cambridge University Press:  16 February 2011

Shlomo Yitzchaik ,
Ashok K. Kakkar ,
Stephen B. Roscoe ,
Tobin J. Marks ,
Paul M. Lundquist ,
Weiping Lin  and
George K. Wong
Shlomo Yitzchaik
Affiliation:
Department of Chemistry, Materials Research Center, Northwestern University, Evanston, Illinois 60208–3113, (USA)
Ashok K. Kakkar
Affiliation:
Department of Chemistry, Materials Research Center, Northwestern University, Evanston, Illinois 60208–3113, (USA)
Stephen B. Roscoe
Affiliation:
Department of Chemistry, Materials Research Center, Northwestern University, Evanston, Illinois 60208–3113, (USA)
Tobin J. Marks
Affiliation:
Department of Chemistry, Materials Research Center, Northwestern University, Evanston, Illinois 60208–3113, (USA)
Paul M. Lundquist
Affiliation:
Department of Physics, Materials Research Center, Northwestern University, Evanston, Illinois 60208–3113, (USA)
Weiping Lin
Affiliation:
Department of Physics, Materials Research Center, Northwestern University, Evanston, Illinois 60208–3113, (USA)
George K. Wong
Affiliation:
Department of Chemistry, Materials Research Center, Northwestern University, Evanston, Illinois 60208–3113, (USA) Department of Physics, Materials Research Center, Northwestern University, Evanston, Illinois 60208–3113, (USA)
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Abstract

The construction of covalently self-assembled second-order nonlinear optical (NLO) Materials containing stilbazole or alkynyl-type high-β chromophores acentrically organized on inorganic oxide substrates is discussed. These structurally different chromophores exhibit differing packing densities on the surface when introduced under the same reaction conditions. In the stilbazolium chromophores, ion-exchange of the chloride counter-anion with very large anionie organic dyes results in appreciably enhanced second harmonic generation (SHG) efficiency. The frequency-dependent SHG response for self-assembled Monolayers derived from the alkynyl-type chromophore was also investigated. The linear absorption spectra exhibit two maxima in the visible region which are assigned to electronically isolated chromophores (480 nm) and aggregated species (540 nm). The dispersion of the second-order NLO coefficient reveals that both microstructures are NLO-active. The origin of the SHG response from both assemblies is discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 328: Symposium Q – Electrical, Optical, and Magnetic Properties of Organic Solid State Materials , 1993 , 27
Copyright
Copyright © Materials Research Society 1994

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References

REFERENCES

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