Fig. 1. Experimental setup

Fig. 2. Chip of dual-beam optical trap with integrated electrodes. (a) Schematic drawing; (b) physical drawing

Fig. 3. Displacement response and square distribution of displacement of microsphere driven by DC signal. (a) Displacement response; (b) square distribution of displacement

Fig. 4. Electric charge of microsphere driven by DC signal

Fig. 5. Displacement response and amplitude diagrams of microsphere driven by AC signal. (a) Displacement response;

Fig. 6. Electric charge of microsphere driven by AC signal