LAUSR

An optophoresis system based on surface plasmons in a simple microfluidic environment is proposed, which introduces new functionalities, including three -dimensional trapping of particles, 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 mechanisms are based on the balance of two oppositely exerted scattering forces induced by two counter-propagating surface plasmons. 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 manipulation chips.