Accession Number : ADA319004

Title :   Photofabrication of Surface Relief Gratings on Azobenzene Polymer Films.

Descriptive Note : Technical rept.,

Corporate Author : MASSACHUSETTS UNIV LOWELL DEPT OF CHEMISTRY

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

PDF Url : ADA319004

Report Date : 21 NOV 1996

Pagination or Media Count : 12

Abstract : Surface relief gratings were photofabricated on various polymer films containing azobenzene groups in the side chains or in the main chain. Formation of the surface relief gratings on the polymer was very sensitive to the polymer structures. The surface gratings were produced on the polymers containing photoisomerizable azobenzene groups. Recording of the gratings was strongly dependent on the polarization of the beams. The localized variations of magnitude and polarization of the resultant electric field in the film are essential to the formation of the surface relief gratings. Large surface modulation (>6000 A) and high diffraction efficiency (>40% into each of + or - 1 order) were obtained under optimal recording conditions. The diffraction efficiency of the surface relief grating was dependent only on the total light energy incident on the film. the surface pattern resulting from straight edge diffraction mapped the negative first derivative of the intensity distribution. Fabrication of various multiple gratings on the same spot of the polymer films were demonstrated. Fourier blazed gratings were also fabricated. The resulting surface pattern was a simple superposition of all the interfering recording waves.

Descriptors :   *GRATINGS(SPECTRA), *POLYMERIC FILMS, *AZOBENZENES, POLARIZATION, OPTIMIZATION, POLYMERS, ENERGY, STRUCTURES, INTENSITY, LIGHT, FABRICATION, ELECTRIC FIELDS, SURFACES, CHEMICAL BONDS, DIFFRACTION, PATTERNS, RECORDING SYSTEMS, MODULATION, WAVES.

Subject Categories : Polymer Chemistry
      Organic Chemistry
      Electricity and Magnetism
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE