TY - JOUR A1 - Goldenberg, Leonid A1 - Köhler, Mathias A1 - Dreyer, Christian T1 - SiO2 Nanoparticles-Acrylate Formulations for Core and Cladding in Planar Optical Waveguides JF - Nanomaterials N2 - A combination of acrylate formulations and SiO2 nanoparticles is investigated with the aim to improve the optical properties of low-refractive index polymers that are used for the fabrication of planar optical waveguides. A decrease in refractive index and also in the thermo-optic coefficient of nanocomposite materials is clearly demonstrated, while some formulations exhibit an increase in the glass transition temperature. The possibility of using these nanocomposite materials to fabricate waveguiding layers with low optical propagation losses at telecommunication wavelengths around 1550 nm is also shown. The nanomaterials can be applied in optical microchips on polymer platforms. KW - fluorinated acrylate KW - silica nanoparticle KW - nanocomposite KW - thermo-optic coefficient KW - optical propagation loss Y1 - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-14057 SN - 2079-4991 VL - 11 IS - 5 PB - MDPI ER - TY - JOUR A1 - Goldenberg, Leonid A1 - Köhler, Mathias A1 - Kahle, Olaf A1 - Dreyer, Christian T1 - Impact of inorganic nanoparticles on optical properties of low refractive index waveguiding polymers JF - Optical Materials Express N2 - The objective of this work is to improve the optical properties of low refractive index polymers used for waveguide by introduction of inorganic nanoparticles. Copolymers of fluorinated monomers and glycidyl methacrylate are used. Introduction of SiO2 nanoparticles into polymer matrix is performed by direct mixing; copolymerization with SiO2 nanoparticles modified by monomer, and in situ sol-gel formation of SiO2 during photochemical cross-linking and annealing catalyzed by photoacid generator. It is demonstrated that nanoparticles are able to decrease thermo-optic coefficient. It is also possible to fabricate waveguiding layers by direct introduction of nanoparticles without compromising of optical propagation losses. Y1 - 2020 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-13521 SN - 2159-3930 VL - 10 IS - 11 SP - 2987 EP - 2997 ER - TY - JOUR A1 - Goldenberg, Leonid A1 - Köhler, Mathias A1 - Dreyer, Christian T1 - Fluorinated Polymers for Photonics—From Optical Waveguides to Polymer-Clad Glass Optical Fibers JF - Applied Sciences N2 - In this paper, our work in the field of fluorinated UV-curable polymers is reviewed. These polymers possessing tunable low refractive indices and low optical propagation losses for telecommunication wavelengths are intended to be used as core and cladding materials for the fabrication of passive channel waveguides in optical microchips on the polymer platform. This application requires low thermo-optic coefficients. With this goal, we used a combination of fluorinated polymers with low-refractive index inorganic nanoparticles of SiO2 and MgF2. Another application requiring extremely low refractive indices is polymer cladding for optical glass fibers. UV-curable fluorinated monomers/oligomers were used. KW - fluorinated acrylate KW - glass fiber KW - nanocomposite KW - nanoparticles KW - optical propagation losses KW - polymer cladding KW - thermo-optic coefficient Y1 - 2025 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-19967 VL - 15 IS - 4 PB - MDPI ER -