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Issue 16, 2013
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Single particle detection, manipulation and analysis with resonant optical trapping in photonic crystals

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Abstract

We demonstrate a resonant optical trapping mechanism based on two-dimensional hollow photonic crystal cavities. This approach benefits simultaneously from the resonant nature and unprecedented field overlap with the trapped specimen. The photonic crystal structures are implemented in a 30 mm × 12 mm optofluidic chip consisting of a patterned silicon substrate and an ultrathin microfluidic membrane for particle injection and control. Firstly, we demonstrate permanent trapping of single 250 and 500 nm-sized particles with sub-mW powers. Secondly, the particle induces a large resonance shift of the cavity mode amounting up to several linewidths. This shift is exploited to detect the presence of a particle within the trap and to retrieve information on the trapped particle. The individual addressability of multiple cavities on a single photonic crystal device is also demonstrated.

Graphical abstract: Single particle detection, manipulation and analysis with resonant optical trapping in photonic crystals

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Publication details

The article was received on 10 Apr 2013, accepted on 21 May 2013 and first published on 23 May 2013


Article type: Paper
DOI: 10.1039/C3LC50447F
Lab Chip, 2013,13, 3268-3274

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    Single particle detection, manipulation and analysis with resonant optical trapping in photonic crystals

    N. Descharmes, U. P. Dharanipathy, Z. Diao, M. Tonin and R. Houdré, Lab Chip, 2013, 13, 3268
    DOI: 10.1039/C3LC50447F

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