“…From the results in Figure , NWs with diameter d = 200–290 support a few guided modes, for instance, HE 11 , TM 01 , and TE 01 modes, in our wavelength range of interest (800–950 nm). The lowest order mode, HE 11 , which has no cutoff frequency, has a maximum field intensity at its center and is known to exhibit maximum intensity for FF at θ = 0 . On the other hand, higher order modes, such as TM 0 n , TE 0 n , and HE mn (with m ≥ 2), have a node at the center in their EM field distributions.…”