Photofabrication of Surface Relief Gratings Using Photodynamic Polymers

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...

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Bibliographic Details
Main Authors: Tripathy, S. K, Kim, D. Y, Jiang, X. L, Li, L, Lee, T. S
Format: Report
Language:English
Subjects:
AZOBENZENES
CHROMOPHORES
ELECTRIC FIELDS
GRADIENT FORCE
GRATINGS(SPECTRA)
MODULATION
MOLECULAR STRUCTURE
Optics
Physical Chemistry
POLYMERIC FILMS
SURFACE CHEMISTRY
SURFACE RELIEF GRATING
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Summary: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.