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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Uusitalo, Sanna
University of Oulu
in Cooperation with on an Cooperation-Score of 37%
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Publications (5/5 displayed)
- 2021Evaluation of MEMS NIR Spectrometers for On-Farm Analysis of Raw Milk Compositioncitations
- 2012Polymeric dual-slab waveguide interferometer for biochemical sensing applicationscitations
- 2011Manipulation of optical field distribution in layered composite polymeric-inorganic waveguidescitations
- 2010Fabrication of optical inverted-rib waveguides using UV-imprintingcitations
- 2010PDMS surface modification in the application of waveguide claddings for evanescent field sensing
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document
PDMS surface modification in the application of waveguide claddings for evanescent field sensing
Abstract
We fabricated SU-8 based slab waveguides onsurface-modified poly(dimethyl siloxane) PDMS lowercladdings for application in evanescent field sensing. Inthis application, higher sensitivity is obtained bygenerating stronger penetrating power above the waveguideinto the analyte. This can be achieved by reducing therefractive index of the substrate. Compared with glasssubstrates that have a refractive index of 1.5, PDMS hasa refractive index of 1.42 at 633 nm, thus serving as abetter lower cladding material for high-sensitivitysensing with an evanescent field or as claddings inmultilayer waveguide applications. In order to increasethe adhesion of PDMS surfaces for successful SU-8application we treated PDMS thin films in low-frequency(40 kHz) oxygen plasma for varied length of exposuretime. The treatment process made PDMS hydrophilic andcreated nano-structures on the surfaces. The resultantsurface topography with different exposure time wasstudied by an interferometric profiler on PDMS lowercladdings and the later spin-coated SU-8 waveguides.Measurement results showed that longer plasma treatmenton PDMS claddings significantly improved the uniformityand waviness of the waveguides. Light propagation testsperformed with a prism coupler and an end-butt couplingsetup proved that PDMS can be used as a proper materialfor SU-8 waveguides.