Issue |
J. Eur. Opt. Soc.-Rapid Publ.
Volume 6, 2011
|
|
---|---|---|
Article Number | 11022 | |
Number of page(s) | 6 | |
DOI | https://doi.org/10.2971/jeos.2011.11022 | |
Published online | 01 July 2024 |
Regular papers
Optical forces and trapping potentials of a dual-waveguide trap based on multimode solid-core waveguides
1
Delft University of Technology, Kavli Institute of Nanoscience, Department of Quantum Nanoscience, Lorentzweg 1, 2628 CJ Delft, The Netherlands
2
Currently with FOM Institute AMOLF, P.O. Box 41883, 1009 Amsterdam, The Netherlands
Received:
28
January
2011
We propose a novel design of the dual-waveguide trap for trapping and Raman identification of microscopic particles and biological objects in a fluid. The device is based on two embedded Si3N4waveguides launching counterpropagating beams into the fluidic channel of a lab-on-a-chip. For waveguides with a square cross-section of 1 µm2, a 5 µm gap in between and for a 785 nm operation wavelength, we perform finite-difference time-domain simulations of the beam profiles and the trapping forces acting on polystyrene beads (diameter 0.2-1.4 µm). The forces reach values up to 16 pN/W for a bead diameter of 1.4 µm, indicating that the trap is very suitable to trap particles in a fluid. This is confirmed by the trapping potentials deduced from the force curves. The design of waveguides and chip is completely compatible with glass-based microfluidic technology, thus enabling mass production and widespead application, contrary to previous approaches.
Key words: integrated optics / waveguides / optical sensing / Raman spectroscopy / optical tweezers
© The Author(s) 2011. All rights reserved.
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