Running Droplet Optical Multiplexer

Lukas Brandhoff 1 , Mahmuda Akhtar 1 , Mike Bülters 2 , Ralf B. Bergmann 2  and Michael J. Vellekoop 1
  • 1 Institute for Microsensors, -acuators and -systems / Microsystems Center Bremen (IMSAS/MCB), University of Bremen, Bremen, Germany
  • 2 BIAS - Bremer Institut für angewandte Strahltechnik, Bremen, Germany


We present an optofluidic device for switching light from multiple inputs to one common output. The device uses a microfluidic channel filled with high index of refraction oil as a waveguide, and moves low refractive index interruptions in the form of aqueous droplets through the channel. Whenever a droplet passes one of the optical inputs, this specific input is switched through to the output. This produces a running switching of one output following the other creating a 8x1 multiplexer.

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This is a peer-reviewed Open Access journal, devoted to the publication of research and applied data from the full spectrum of Optofluidics, Microfluidics and Nanofluidics; designed to facilitate the exchange of ideas between researchers and especially practitioners from different disciplines ranging from biology to chemistry to engineering.