Nanoporous polymer films were prepared by using surfactant as porogen in order to be used as optical waveguides. We
prepared porous polymer films by spin-coating of PMMA solutions containing surfactant (NaDDBS) at concentrations
higher than the critical micelle concentration (CMC). The pore structure of the films was affected by such factors as the
type of the pore generator (porogen) and solvent, the molecular weight of the polymer, and processing parameters. After
removal of NaDDBS, the nanoporous structure was observed via FE-SEM. Since the resulting pore size is much smaller
than the wavelength of the visible light, the nanoporous thin films were optically homogeneous. The refractive index was
given by an average over the film, and it was controlled by changing the amount of the surfactant in the film. The
refractive index of the nanoporous polymer film was found to decrease with the increase in the pore volume ratio.
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