Fig. 2

The electromagnetic energy focusing effect in the Ag chiral particle chain-film system. a, b The electric near-field distributions in the x-y plane in the middle of gap between chiral particle-film at different resonant peaks for the system excited by LCP (a) and RCP (b) light, respectively. Each picture corresponds to the marked resonant peak. c Electric field enhancements in the gaps F1, F2, F3, and F4, indicated in the right pictures (and in a as well) show huge differences at resonant peaks. The blue and red solid lines represent electric field enhancement for LCP and RCP light. The vertical dashed lines from left to right correspond to the peaks at 590, 635, 710, and 785 nm, respectively