Fig. 1. Diagram of scanning optical tweezers system

Fig. 2. Dynamic displacement of dual particles and the variation of interparticle forces

Fig. 3. Particle force response under different optical trap intensities

Fig. 4. Plot of trap position and tracked particle position

Fig. 5. Amplitude ratio and phase lag vs frequency

Fig. 6. The relationship between the energy storage modulus G' and the viscosity η with frequency