Optical Sciences

Biomolecules and nanostructures

The Optical Sciences group studies the interaction of light and matter at the nanoscale. We do this by exploring ways to shape light and its environment. It's what we call active and passive control. Our current focus is on the interaction of light with biomolecules and nanostructures. We are part of Twente University's Department of Science and Technology and member of the MESA+ institute.
We participate in the EU-COST actions MP1102: Coherent Raman microscopy (MicroCor) and CM1202: Supramolecular photocatalytic water splitting (PERSPECT-H2O)


Particle manipulation by ultrasonic waves

  • Jorick van 't Oever - PhD student
  • Herman Offerhaus - Scientific Staff
  • Lourens van Emmerik - Former member

  • The goal of this project the goal is move particles to a specific position within a liquid using high frequency acoustic waves. This is done by applying a standing pressure wave on particles in a flow. Due to the difference in compressibility, particles tend to align on the nodes and by moving the nodes of the standing waves, the particles can be moved towards the side of the flow channel. Since this technique can be used for a wide variety of particles, applications range from (microbiological) analysis of drinking water to filtering of contaminated water in petrochemical industries.


    The following articles have been published regarding this project:

    Early interferometric detection of rolling contact fatigue induced microcracking in railheads

    (abstract) (full pdf)
    J.J.F. van 't Oever, D. Thompson, F. Gaastra, H.A. Groendijk, H.L. Offerhaus
    NDT & E International
    Vol. 86, p.14-19 available nov 15 2016 edition march 2017

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

    (abstract) (full pdf)
    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
    Printable version