Mr. Shiyun Lin Profile

Shiyun Lin

at Harvard Univ

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Proceedings Article | 17 February 2011 Paper

Microparticle sorting using a slot waveguide splitter

Shiyun Lin, Kenneth Crozier

Proceedings Volume 7950, 79500W (2011) https://doi.org/10.1117/12.874950

KEYWORDS: Particles, Waveguides, Channel waveguides, Near field optics, Microfluidics, Channel projecting optics, Silicon, Lab on a chip, Switches, Magnetism

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We demonstrate an on-chip microparticle passive sorting device employing a 3-dB optical splitter that consists of a slot waveguide and a conventional channel waveguide. Simulations indicate that the optical force in the vertical direction exerted on small particles (d < 1 μm) by the slot waveguide is larger than that by the channel waveguide. On the other hand, the channel waveguide provides a stronger vertical force on large particles (d > 1 μm) than the slot waveguide. The in-plane optical force provides a double-well trapping potential for small particles only. We perform experiments in which small (320 nm diameter) and large (2 μm diameter) particles are brought to the splitter by the channel waveguide. Due to a structural perturbation provided by a stuck bead, the small particles are transferred to the slot waveguide. The large particles remain on the channel waveguide. The automated nature of this method, along with the low guided power employed (20 mW in these experiments), makes this a promising approach for sorting sub-micron particles.

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