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Layer-by-Layer Molecular Assembly Approaches to the Construction of Thin Films Having High Second-Order Optical Nonlinearities

Published online by Cambridge University Press:  25 February 2011

David S. Allan ,
Fuyuhiko Kubota ,
Ashok K. Kakkar ,
Tobin J. Marks ,
Tongguang Zhang ,
Weiping Lin ,
Mingchih Shih ,
George K. Wong  and
Pulak Dutta
David S. Allan
Affiliation:
Department of Chemistry and Materials Research Center, Northwestern University, Evanston, IL 60208–3113
Fuyuhiko Kubota
Affiliation:
Department of Chemistry and Materials Research Center, Northwestern University, Evanston, IL 60208–3113
Ashok K. Kakkar
Affiliation:
Department of Chemistry and Materials Research Center, Northwestern University, Evanston, IL 60208–3113
Tobin J. Marks
Affiliation:
Department of Chemistry and Materials Research Center, Northwestern University, Evanston, IL 60208–3113
Tongguang Zhang
Affiliation:
Department of Physics and Astronomy and Materials Research Center, Northwestern University, Evanston, IL 60208–3113
Weiping Lin
Affiliation:
Department of Physics and Astronomy and Materials Research Center, Northwestern University, Evanston, IL 60208–3113
Mingchih Shih
Affiliation:
Department of Physics and Astronomy and Materials Research Center, Northwestern University, Evanston, IL 60208–3113
George K. Wong
Affiliation:
Department of Physics and Astronomy and Materials Research Center, Northwestern University, Evanston, IL 60208–3113
Pulak Dutta
Affiliation:
Department of Physics and Astronomy and Materials Research Center, Northwestern University, Evanston, IL 60208–3113
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Abstract

Chromophoric multilayer thin films exhibiting efficient second harmonic generation have been constructed on inorganic substrates via a stepwise layer-by-layer process using molecular self-assembly techniques. In each step, chemical species bearing appropriate functional groups form covalent bonds with functional groups deposited in the previous step. Bulk acentricity is achieved by the orientation of chromophore-containing layers outward from the substrate surface. A new chromophore having comparable hyperpolarizability but different steric and transparency characteristics than the stilbazolium chromophore used previously has been incorporated into self-assembled films. The large effects of octachlorotrisiloxane capping on the structure of these films have been investigated by second harmonic generation and X-ray reflectivity measurements. Novel in situ measurements of second harmonic generation efficiency as a function of chromophore layer growth are described and provide information useful for optimizing deposition conditions and understanding the film growth process.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 247: Symposium N – Electrical, Optical, and Magnetic Properties of Organic Solid State Materials , 1992 , 779
Copyright
Copyright © Materials Research Society 1992

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References

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