Accession Number : ADP007595

Title :   Large Non Resonant Nonlinearities in DANS Based Polymer Waveguide: Role of Microscopic Cascading,

Corporate Author : UNIVERSITY OF CENTRAL FLORIDA ORLANDO CENTER FOR RESEARCH IN ELECTRO-OPTICS A ND LASERS

Personal Author(s) : Assanto, Gaetano ; Stegeman, George I. ; Marques, Manuel B. ; Torruellas, William E.

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : Polymers can exhibit both large and fast nonresonant third-order nonlinearities which rely on Pi-electron delocalization and conjugation, as well as good physical and chemical properties suitable for the fabrication of nonlinear integrated optics devices. Soluble polymers with strong charge transfer states such asymmetrically substituted 4-dialkylamino-4'-nitro-stilbene (DANS) and 4-dialkylamino-4'-nitro-diphenylbu-tadiene (DAN2) side-groups were originally developed for electro-optic applications because of their large second order nonlinearities and low propagation losses in waveguide form. Using nonlinear grating coupling we found a large value for n sub 2, the Kerr coefficient. Measurements and analysis of the spectral dispersion of third harmonic generation indicate that the dominant contribution to the nonlinearity is due to the local cascading of second order nonlinearities.

Descriptors :   *THIRD HARMONIC GENERATION, *OPTICAL CIRCUITS, CHARGE TRANSFER, CHEMICAL PROPERTIES, COEFFICIENTS, COUPLINGS, ELECTRONS, FABRICATION, LOSSES, MEASUREMENT, OPTICS, POLYMERS, PROPAGATION, WAVEGUIDES, SYMPOSIA, STILBENES, BUTADIENES, INTEGRATED SYSTEMS, DISPERSION RELATIONS.

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE