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(Color online) Principle of trapping of particles in multiple planes using modified self-imaging. The depth of each separate microfluidic chamber is comparable to half of the Talbot distance. The particle array 2 shifts half of the period laterally with regard to particles 1 and 3.
SEM photo of the amplitude grating fabricated by EBL.
System configuration of optical trapping system for trapping in single plane or multiple planes.
(Color online) Micrograph of the particles simultaneously trapped at multiple levels. The trapping of multilevel particles occurs at the highlighted region. (a) Trapping of array of polystyrene particles at lower level induced by the self-imaging effect of amplitude chessboard grating. (b) Trapping of silica particles (highlighted in blue squares) at higher level corresponding to the light spots of optical lattice.
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