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(a) General molecular structure of (1,4)-dihydropyridine derivatives and its photochemical reaction. (b) Molecular structure of DHP-A. (c) Molecular structure of DHP-B.
Photographs of writing waveguide core in (a) a conventional polyimide without DHP, (b) the PSPI resin with DHP-A, and (c) with DHP-B.
Absorption coefficients of the PSPI resins at the as a function of exposure. Open and closed circles indicate the data for the resin with DHP-A and DHP-B, respectively. The coefficients were obtained from time evolution of transmitted laser-light intensity through the spin-coated and prebaked PSPI films.
Exposure dependence of absorption spectra for PSPI resins with (a) DHP-A and (b) DHP-B derivatives as photosensitizer. Dotted, dashed, dashed-and-dotted, and solid lines plot the data after 0, 10, 100, and exposure, respectively.
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