Journal
LAB ON A CHIP
Volume 13, Issue 16, Pages 3268-3274Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3lc50447f
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Funding
- Swiss National Centre of Competence in Research Quantum Photonics
- Swiss National Science Foundation [200021_134541]
- Swiss National Science Foundation (SNF) [200021_134541] Funding Source: Swiss National Science Foundation (SNF)
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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.
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