Optical Sciences

Biomolecules and nanostructures

The Optical Sciences group studies the interaction of light and matter. Our current focus is on detection and sensing/imaging with an emphasis on the development of integrated photonics. We are part of Twente University's Department of Science and Technology and member of the MESA+ institute.


In-chip direct laser writing of a centimeter-scale acoustic micromixer

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Jorick van ‘t Oever, Niels Spannenburg, Herman Offerhaus, Dirk van den Ende, Jennifer Herek, Frieder Mugele
Journal of Micro/Nanolithography, MEMS, and MOEMS
14(2), 023503 Apr. 1, 2015

A centimeter-scale micromixer was fabricated by two-photon polymerization inside a closed micro-channel using direct laser writing. The structure consists of a repeating pattern of 20 μm X 20 μm X 155 μm acrylate pillars and extends over 1.2 cm. Using external ultrasonic actuation, the micropillars locally induce streaming with flow speeds of 30 μms-1 . The fabrication method allows for large flexibility and more complex designs.
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