The angular dependent EFavg of S42 AgNR 2D hexagonal array with AR = 3.5. The excitation wavelength is 632.8 nm. The insert illustrates the incident direction and angle. The incident polarization is in the x–y plane and perpendicular to the propagation. The symbols, and //, denote that the incident directions are perpendicular and parallel to the long axis of the nanorods, respectively.