Figure 4

(a) Transverse optical trapping potential generated by the transverse optical forces (F_x and F_y) on a 10 nm dielectric particle; (b,c) The variation of transverse optical trapping potential (U_xy) along y = 0 nm and x = 74.5 nm. The full-width at haft maximum (FWHM) of the trapping potential is also indicated.