Formation of a graded-index waveguide in UV exposed polyimide
- 15 March 1997
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 81 (6) , 2889-2891
- https://doi.org/10.1063/1.363948
Abstract
We report on the formation of a graded-index waveguide in a photocrosslinkable fluorinated polyimide upon its photodarkening with the spectral line 313 nm of a mercury arc lamp at exposures exceeding 5 J/cm2. Photodarkening prevents the UV radiation from penetration deep into the polymer and finally sets the region with increased refractive index near the top surface. A theoretical model based on this concept reconstructs the refractive index profile of the waveguide in agreement with the phase integral calculations based on waveguide mode spectrum.This publication has 10 references indexed in Scilit:
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