Issue 19, 2012
From the journal:

Lab on a Chip

Optical trapping of microparticles using silicon nitride waveguide junctions and tapered-waveguide junctions on an optofluidic chip†

Hong Caia  and  Andrew W. Poon*a  

* Corresponding authors

a Photonic Device Laboratory, Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China
E-mail: eeawpoon@ust.hk
Fax: 852 2358 1485
Tel: 852 2358 8532

Abstract

We study optical trapping of microparticles on an optofluidic chip using silicon nitride waveguide junctions and tapered-waveguide junctions. We demonstrate the trapping of single 1 μm-sized polystyrene particles using the evanescent field of waveguide junctions connecting a submicrometer-sized input-waveguide and a micrometer-sized output-waveguide. Particle trapping is localized in the vicinity of the junction. We also demonstrate trapping of one and two 1μm-sized polystyrene particles using tapered-waveguide junctions connecting a submicrometer-sized singlemode input-waveguide and a micrometer-sized multimode output-waveguide. Particle trapping occurs near the taper output end, the taper center and the taper input end, depending on the taper aspect ratio.

Graphical abstract: Optical trapping of microparticles using silicon nitride waveguide junctions and tapered-waveguide junctions on an optofluidic chip

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Article information

DOI
https://doi.org/10.1039/C2LC40636E
Article type
Paper
Submitted
03 Jun 2012
Accepted
18 Jul 2012
First published
23 Jul 2012

Lab Chip, 2012,12, 3803-3809

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Optical trapping of microparticles using silicon nitride waveguide junctions and tapered-waveguide junctions on an optofluidic chip

H. Cai and A. W. Poon, Lab Chip, 2012, 12, 3803 DOI: 10.1039/C2LC40636E

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