We report a method for preparing tunable Bragg-mirrors from multilayers of polymers and polymer composite filled with TiO2 nanoparticles. The TiO2 particles were prepared through a sol-gel process and were used to increase the refractive index in the high index layer of the Bragg mirror. Optical ellipsometry measurements showed that layers with a refractive index of 1.7 could be obtained. This layers were co-deposited with PMMA and PDMAA based materials with refractive indices below 1.5 in each case. Highly transparent Bragg mirrors with a reflectance of the desired wavelength of more that 95% are obtained from such assemblies after deposition of about 18 layer pairs. Using swellable materials as the low index layer it is also possible to tune the reflected wavelength over a range of approximately 150 nm.

High refractive composite materials for responsive Bragg-mirrors

243rd National Meeting (2012)

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