| Summary: | 碩士 === 大同工學院 === 電機工程研究所 === 81 === In recently years, rapid development in communication and
signal processing has produced considerable interest in and
polymeric material that exhibit optical nonlinearity larger
than those available commercially. In this thesis, we have
successively constructed and demonstrated an optical nonlinear
organic polymer with cross-linked gelatin and nonlinear moiety,
4-nitrophenol. According to the systematic experiment,
characterization of the material in integrated optics
application has been investigated: adjusting the dopant
concentration of nonlinear molecules, the refractive index of
waveguides can be controlled between 1.43 to 1.54 and the glass
transition temperature (Tg) is between 88 to 108C. From
different conditions of waveguide fabrication process, it can
be concluded that when the spinner coating speed is between
1000 to 2000 rpm and the baked temperature is 60C, a uniform
and low loss planar waveguide can be obtained. Besides,
nonlinearity in molecules and polymers is studied and their
application in integrated optics is described. Finally, the
propagation constants and field distribution of the propagation
modes in three-layer planar waveguide have been calculated.
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