A heterogeneous particle stream enters from the left in a microfludic capillary
A standing wave is created by counter-propagating laser beams, such as in a Fabry-Perot cavity
The standing wave is at an acute angle (45°) to the particle flow direction
This standing wave exerts optical force on the particles, causing longitudinal displacement that varies with particle size, density or index of refraction
The longitudinal displacement can be controlled by balancing input parameters such as optical force and flow rate
A barrier is placed at the end of the cavity (right side) which isolates a specific size (or size range) of particles
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