Figure 7. Measurement of mechanical properties of the trapped SNW.

(a) Stiffness in translational direction (x, y and z) and (b) torque constant in the x and y direction of laser power variation. (c) Polarization asymmetry of k_x and k_y, (d) Trap aspect ratio of stiffness k_x, k_y and k_z and (e) Polarization asymmetry of the torque constant. The range of incident laser power is 30–55 mW of the experiments in (a–e). (f) Simultaneously measured polarization asymmetry of stiffness and torque constant, dependent on the polarization angle of the incident laser (0–180°).