27 August 2010 Di-block co-polymer derived nanoporous polymer liquid core waveguides
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Nanoporous liquid core waveguides are fabricated by selectively UV modifying a nanoporous polymer. The starting point is a diblock polymer where 1,2-polybutadiene (PB) molecules are bound to PDMS. When the PB is cross linked it self-assembles into PB with a network of 14 nm diameter PDMS filled pores. When the PDMS is etched, the hydrophobic PB is left with a porosity of 44%. The polymer is subsequently UV exposed through a shadow mask. This renders the exposed part hydrophilic, making it possible for water to infiltrate these areas. Water infiltration raises the refractive index, thus forming a liquid core waveguide. Here we present both the fabrication scheme and characterization results for the waveguides.
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Mads B. Christiansen, Mads B. Christiansen, Nimi Gopalakrishnan, Nimi Gopalakrishnan, Kaushal S. Sagar, Kaushal S. Sagar, Sokol Ndoni, Sokol Ndoni, Anders Kristensen, Anders Kristensen, } "Di-block co-polymer derived nanoporous polymer liquid core waveguides", Proc. SPIE 7764, Nanoengineering: Fabrication, Properties, Optics, and Devices VII, 77640J (27 August 2010); doi: 10.1117/12.860805; https://doi.org/10.1117/12.860805

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