We present a microfluidic chip in Polymethyl methacrylate ( PMMA) for optical trapping of particles in an 80 mu m wide microchannel using two counterpropagating single-mode beams. The trapping fibers are separated from the sample fluid by 70 mu m thick polymer walls. We calculate the optical forces that act on particles flowing in the microchannel using wave optics in combination with non-sequential ray-tracing and further mathematical processing. We use a novel fabrication process that consists of a premilling step and ultraprecision diamond tooling for the manufacturing of the molds and double-sided hot embossing for replication, resulting in a robust microfluidic chip for optical trapping. In a proof-of-concept demonstration, we show the trapping capabilities of the hot embossed chip by trapping spherical beads with a diameter of 6 mu m, 8 mu m and 10 mu m and use the power spectrum analysis of the trapped particle displacements to characterize the trap strength.
Original languageEnglish
Title of host publicationMicro-Optics 2016
PublisherSPIE
Number of pages9
Volume9888
ISBN (Print)978-1-5106-0133-8
DOIs
Publication statusPublished - 27 Apr 2016
EventConference on Micro-Optics - Brussels, Belgium
Duration: 4 Apr 20165 Apr 2016

Conference

ConferenceConference on Micro-Optics
CountryBelgium
CityBrussels
Period4/04/165/04/16

    Research areas

  • MANIPULATION, TWEEZERS, FORCES

ID: 29135898