Fig. 1. Illustration of optical design generating dual-line traps in top view (top) and front view (bottom). CL1 and CL2, cylindrical lenses; L1 and L2, plano-convex lenses; Obj, objective. Not to scale.

Fig. 2. Normalized intensity distribution of various line traps. (a) The dual-line traps and the line traps with the rotation angles of (b) 20°, (c) 90°, and (d) 110° counterclockwise. Scale bar: 10 µm.

Fig. 3. Schematic of optical setup for the line traps generation and particles manipulation. DM, dichroic mirror; PD, petri dish; UL, uniform light.

Fig. 4. Microscopic images of (a) the laser source and focused lines at the rotation angles of (b) 0°, (c) 20°, (d) 90°, and (e) 110°. Scale bar: 10 µm.

Fig. 5. Microscopic images for particles sizes of (a) 5 µm, (b) 10 µm, (c) 15 µm, and (d) 20 µm trapped by the dual lines and for particles sizes of (e) 5 µm, (f) 10 µm, (g) 15 µm, and (h) 20 µm trapped by the single line. Scale bar: 10 µm.

Fig. 6. Images of the particles (20 µm diameter) revolved as the rotation angle of (a) 0°, (b) 20°, and (c) 60°. Green lines denote trapping lines. Scale bar: 20 µm.