Trapping forces, force constants, and potential depths for dielectric spheres in the presence of spherical aberrations

摘要: We present and verify a theoretical model that predicts trapping forces (escape forces), force constants (trap stiffnesses), potential depths for dielectric spheres with diameters smaller than or equal to the wavelength of light. Optical can be calculated arbitrary incident light distributions two-component approach determines gradient scattering separately. investigate influence spherical aberrations are due refractive-index mismatch on maximum force, constant, depth trap, which important optical tweezer applications. The relationships between three parameters explained studied different degrees aberration various (refractive indices ns = 1.39–1.57, radii 0.1–0.5 µm, λ0 1.064 µm). find all decrease when distance coverslip increases. Effects could make interpretation experimental results ambiguous simulated explained. Computational compared data found in literature. A good coincidence established.