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  • Title: Multimode interference devices for focusing in microfluidic channels.
    Author: Hunt HC, Wilkinson JS.
    Journal: Opt Lett; 2011 Aug 15; 36(16):3067-9. PubMed ID: 21847162.
    Abstract:
    Low-cost, compact, automated optical microsystems for chemical analysis, such as microflow cytometers for identification of individual biological cells, require monolithically integrated microlenses for focusing in microfluidic channels, to enable high-resolution scattering and fluorescence measurements. The multimode interference device (MMI), which makes use of self-imaging in multimode waveguides, is shown to be a simple and effective alternative to the microlens for microflow cytometry. The MMIs have been designed, realized, and integrated with microfluidic channels in a silica-based glass waveguide material system. Focal spot sizes of 2.4 μm for MMIs have been measured at foci as far as 43.7 μm into the microfluidic channel.
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