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Issue 2, 2010
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Ultralow power trapping and fluorescence detection of single particles on an optofluidic chip

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Abstract

The development of on-chip methods to manipulate particles is receiving rapidly increasing attention. All-optical traps offer numerous advantages, but are plagued by large required power levels on the order of hundreds of milliwatts and the inability to act exclusively on individual particles. Here, we demonstrate a fully integrated electro-optical trap for single particles with optical excitation power levels that are five orders of magnitude lower than in conventional optical force traps. The trap is based on spatio-temporal light modulation that is implemented using networks of antiresonant reflecting optical waveguides. We demonstrate the combination of on-chip trapping and fluorescence detection of single microorganisms by studying the photobleaching dynamics of stained DNA in E. coli bacteria. The favorable size scaling facilitates the trapping of single nanoparticles on integrated optofluidic chips.

Graphical abstract: Ultralow power trapping and fluorescence detection of single particles on an optofluidic chip

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Publication details

The article was received on 04 Aug 2009, accepted on 02 Oct 2009 and first published on 16 Nov 2009


Article type: Paper
DOI: 10.1039/B915750F
Lab Chip, 2010,10, 189-194

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    Ultralow power trapping and fluorescence detection of single particles on an optofluidic chip

    S. Kühn, B. S. Phillips, E. J. Lunt, A. R. Hawkins and H. Schmidt, Lab Chip, 2010, 10, 189
    DOI: 10.1039/B915750F

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