Dual fiber optical trapping in a polymer-based microfluidic chip

Heidi Ottevaere; Diane de Coster; Michael Vervaeke; Jürgen Van Erps; Manly Callewaert; Pieter Wuytens; Wim De Malsche; Hugo Thienpont

doi:10.1117/12.2227917

27 April 2016 Dual fiber optical trapping in a polymer-based microfluidic chip

Heidi Ottevaere, Diane de Coster, Michael Vervaeke, Jürgen Van Erps, Manly Callewaert, Pieter Wuytens, Wim De Malsche, Hugo Thienpont

Author Affiliations +

Proceedings Volume 9888, Micro-Optics 2016; 98880B (2016) https://doi.org/10.1117/12.2227917
Event: SPIE Photonics Europe, 2016, Brussels, Belgium

Abstract

We present a microfluidic chip in Polymethyl methacrylate (PMMA) for optical trapping of particles in an 80μm wide microchannel using two counterpropagating single-mode beams. The trapping fibers are separated from the sample fluid by 70μm 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 6μm, 8μm and 10μm and use the power spectrum analysis of the trapped particle displacements to characterize the trap strength.

Citation Download Citation

Heidi Ottevaere, Diane de Coster, Michael Vervaeke, Jürgen Van Erps, Manly Callewaert, Pieter Wuytens, Wim De Malsche, and Hugo Thienpont "Dual fiber optical trapping in a polymer-based microfluidic chip", Proc. SPIE 9888, Micro-Optics 2016, 98880B (27 April 2016); https://doi.org/10.1117/12.2227917

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