Fig. 4.

Trapping configurations. a Different orientations of ACT for elliptically polarized laser beam propagating along z-axis. With a tightly focused laser spot, the ACT aligns with the propagation direction resulting in a vertical configuration. Increasing the spot size causes the ACT to prefer a horizontal configuration while remaining trapped loosely within the illuminated region. b Extinction cross section vs wavelength for 250 nm silver nanodisks for vertical and horizontal configuration. c, d Enhancement of electric field for the nanodisks in vertical configuration and horizontal configuration under 1064 nm illumination. Both scale bars are 100 nm. e, f Trapping of 400 nm PS particles in plasmonic near-field for vertical and horizontal configuration. Both Scale bars are 1 μm