Figure 5.9 — Radiation force on a sphere in an optical tweezers

Fig. 5.9 — Radiation force on a sphere in an optical tweezers
Figure 5.9 — Radiation force on a sphere in an optical tweezers. Reference frames used to calculate the radiation force from a focused beam. The scattering problem is solved in the reference frame of the particle, centred at C, whereas we want to calculate the radiation force and torque with respect to the laboratory frame centred at the laser beam focus O.