Accession Number : ADA329278

Title :   Photofabrication of Surface Relief Gratings Using Photodynamic Polymers

Descriptive Note : Technical rept.

Corporate Author : MASSACHUSETTS UNIV LOWELL DEPT OF CHEMISTRY

Personal Author(s) : Tripathy, S. K. ; Kim, D. Y. ; Jiang, X. L. ; Li, L. ; Lee, T. S.

PDF Url : ADA329278

Report Date : 19 SEP 1997

Pagination or Media Count : 13

Abstract : We present novel observation and detailed investigation of a photodynamic polymer transport process. Surface gratings were photofabricated on various polymer films containing azo groups in the side chain or in the main chain. Effects of the polymer structures on the formation of the surface gratings were investigated. Large surface modulation (>6000 A) and high diffraction efficiency (>40%) could be obtained under optimal conditions. Fabrication of various multiple gratings on the same spot was demonstrated. The resulting pattern was a simple superposition of all the interfering recording waves. The surface pattern mimics the light pattern and gradient forces acting on the azo dipoles are responsible for the large scale displacement of the polymer surface. Chromophores molecules on the viscous surface layers are plasticized by trans-cis- trans isomerization and are dragged by "optical tweezer" effect of the electric field gradient.

Descriptors :   *POLYMERIC FILMS, *AZOBENZENES, CHROMOPHORES, ELECTRIC FIELDS, GRATINGS(SPECTRA), MOLECULAR STRUCTURE, SURFACE CHEMISTRY, MODULATION.

Subject Categories : Physical Chemistry
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE