Thursday, August 11, 2016

A Plasmonic Optophoresis for Manipulating, In-situ Position Monitoring, Sensing, and 3D trapping of Micro/Nanoparticles

Mostafa Ghorbanzadeh, Mohammad Moravvej-Farshi; Sara Darbari

An optophoresis system based on surface plasmons in a simple microfluidic environment is proposed, which introduces new functionalities, including three dimensional trapping of par-ticles, bidirectional manipulation, controllable sorting, and in-situ sensing. Its operating principle is based on plasmonic field, which is excited by the Kretschmann configuration on a gold stripe. In this system, trapping, manipulating, and sorting mech-anisms are based on the balance of two oppositely exerted scat-tering forces induced by two counter-propagating surface plas-mons. Moreover, for detecting particle’s intrinsic properties and in-situ position monitoring, we take advantage of the particle’s lens-like behavior and stripe’s edge effects. The proposed low power functional system that can be simply and inexpensively integrated into lab-on-a-chip devices is a promising candidate for biological applications and developing integrated optical manipu-lation chips.
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