Optical polymers with tunable refractive index for nanoimprint technologies

Landwehr J, Fader R, Rumler M, Rommel M, Bauer A, Frey L, Simon B, Fodor B, Petrik P, Schiener A, Winter B, Spiecker E (2014)


Publication Type: Journal article

Publication year: 2014

Journal

Publisher: Institute of Physics: Hybrid Open Access

Book Volume: 25

Pages Range: Article number 505301

Journal Issue: 50

DOI: 10.1088/0957-4484/25/50/505301

Abstract

In order to realize a versatile high throughput production of micro-optical elements, UV-curable polymer composites containing titanium dioxide nanoparticles were prepared and characterized. The composites are based on an industrial prototype epoxy polymer. Titanium dioxide nanoparticles smaller than 10 nm were synthesized by the nonaqueous sol method and in situ sterically stabilized by three different organic surfactants. The composites exhibit high transparency. Distinct alteration of optical transmission properties for visible light and near IR wavelength range could be avoided by adaption of the stabilizing organic surfactant. Most importantly, the refractive index (RI) of the composites that depends on the fraction of incorporated inorganic nanoparticles could be directly tuned. E.g. the RI at a wavelength of 635 nm of a composite containing 23 wt% titanium dioxide nanoparticles is increased to 1.626, with respect to a value of 1.542 for the pure polymer. Furthermore, it could be demonstrated that the prepared inorganic-organic nanocomposites are well suited for the direct fabrication of low-cost micro-optical elements by nanoimprint lithography. A low response of the optical composite properties to temperature treatment up to 220°C with a shrinkage of only about 4% ensures its application for integrated micro-optical elements in industrial production.

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APA:

Landwehr, J., Fader, R., Rumler, M., Rommel, M., Bauer, A., Frey, L.,... Spiecker, E. (2014). Optical polymers with tunable refractive index for nanoimprint technologies. Nanotechnology, 25(50), Article number 505301. https://dx.doi.org/10.1088/0957-4484/25/50/505301

MLA:

Landwehr, J., et al. "Optical polymers with tunable refractive index for nanoimprint technologies." Nanotechnology 25.50 (2014): Article number 505301.

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