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. 2009 Dec 21;17(26):24342-8.
doi: 10.1364/OE.17.024342.

Multi-mode mitigation in an optofluidic chip for particle manipulation and sensing

Philip Measor  1 , Sergei Kühn, Evan J Lunt, Brian S Phillips, Aaron R Hawkins, Holger Schmidt
Affiliations

Multi-mode mitigation in an optofluidic chip for particle manipulation and sensing

Philip Measor et al. Opt Express. .

Abstract

A new waveguide design for an optofluidic chip is presented. It mitigates multi-mode behavior in solid and liquid-core waveguides by increasing fundamental mode coupling to 82% and 95%, respectively. Additionally, we demonstrate a six-fold improvement in lateral confinement of optically guided dielectric microparticles and double the detection efficiency of fluorescent particles.

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Figures

Fig. 1
Fig. 1
(a) Top down schematic of an ARROW optofluidic platform with ridge-type solid-core ARROWs (SC), intersecting SC (iSC), liquid-core ARROWs (LC), and attached reservoirs (R). (b) Single-mode fiber (SMF), SC, to LC coupling scheme defining the SMF core width, wSMF, SC width, wSC, LC width, wLC, and device facet input coupling coefficient, κi.
Fig. 2
Fig. 2
First generation device liquid-core waveguide intensity pattern for (a) experimental measurement and (b) corresponding simulation.
Fig. 3
Fig. 3
Solid-core ARROW (a) fundamental mode coupling, κ1, as a function of waveguide width, wSC and (b) transmittance, T, as a function of waveguide length, LSC.
Fig. 4
Fig. 4
Representation of the single-mode fiber (SMF) and solid-core ARROW (SC) interface coupling coefficient κf for SC width wSC, SC taper over length Lt, and liquid-core ARROW (LC) coupling, κj for LC width wLC.
Fig. 5
Fig. 5
Tapered solid-core ARROW (a) fundamental mode coupling coefficient, κ1, and taper length, Lt, dependence; (b) κ1 wavelength, λ, dependence for Lt = 550μm; and (c) fabricated device for wSC = 4μm, wLC = 12μm, and Lt = 550μm.
Fig. 6
Fig. 6
Second generation device liquid-core ARROW intensity pattern for (a) experimental measurement and (b) corresponding simulation.
Fig. 7
Fig. 7
(a) Particle trajectory in a liquid-core ARROW (left) and lateral position distribution, p(x), (right) with NIR beam guiding of a microparticle. The collected particle fluorescence with a guiding beam (b) off and (c) on.
Fig. 8
Fig. 8
Representative still frames of movies showing the fluorescence of particles as they flow past the intersection of the solid to liquid core ARROWs with a NIR guiding beam (a) off (Media 1) and (b) on (Media 2) (blue: low intensity and red: high intensity, scale bar ~12μm).
See this image and copyright information in PMC

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References

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