Extended Data Fig. 6: Chiroptical responses of desymmetrized AuNCats under circularly polarized light.
a–e and f–j show the chiroptical responses of a (P)- and an (M)-AuNCat shown in Fig. 3b, respectively. a,f, SEM images of AuNCats at different tilt angles. b,g, Corresponding structures to a and f used in FEM calculations. c,h, Experimental spectra (top panel) and calculated scattering cross-sections (bottom panel) under LCP (red line) and RCP (blue line). The simulations agree well with the experiments for the desymmetrized AuNCats. The small difference in peak wavelengths and intensity of the resonances could have been resulted from the structural inexactitude from the SEM images and imparity in the portion between vertically and parallelly propagating light. d,e,i,j, Measured circular dichroism (d,i, top panels) and g-factor of each AuNCat (e,j, top panels), originated from the different optical responses to LCP and RCP light in c and h. The theoretical circular dichroisms and g-factors are shown in the bottom panels, and they accord closely with the experiments. All SEM images were taken by field-emission SEM (MERLIN Compact, Carl Zeiss, Germany) at 10 kV and the scale bars indicate 100 nm.
