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

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 x 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.


Published in:
Lab On A Chip, 13, 16, 3268-3274
Year:
2013
Publisher:
Cambridge, Royal Society of Chemistry
ISSN:
1473-0197
Laboratories:




 Record created 2013-10-01, last modified 2018-09-13

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