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Issue 9, 2006
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High-speed fabrication of patterned colloidal photonic structures in centrifugal microfluidic chips

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Abstract

In this paper, we report a rapid and facile method for fabricating colloidal photonic crystals inside microchannels of radially symmetric microfluidic chips which were made using soft-lithography. As the suspension of monodisperse silica or polystyrene latex spheres was driven to flow through the channels under the action of centrifugal force, the colloidal spheres were quickly assembled into face centered cubic arrangement which had a few photonic stop bands. The soft-microfluidic channels and cells confined the colloidal crystals into designed patterns. The optical reflectance was modulated by the refractive-index mismatch between the colloidal particles and the solvent in the interstices between the particles. Therefore, the present microfluidic chips with built-in colloidal photonic crystals can be used as in-situ optofluidic microsensors for high throughput screening or light filters in integrated adaptive optical devices.

Graphical abstract: High-speed fabrication of patterned colloidal photonic structures in centrifugal microfluidic chips

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Publication details

The article was received on 08 May 2006, accepted on 01 Jun 2006 and first published on 23 Jun 2006


Article type: Paper
DOI: 10.1039/B606448E
Citation: Lab Chip, 2006,6, 1171-1177
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    High-speed fabrication of patterned colloidal photonic structures in centrifugal microfluidic chips

    S. Lee, G. Yi and S. Yang, Lab Chip, 2006, 6, 1171
    DOI: 10.1039/B606448E

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