700\,$nm), before BW scattering takes over at shorter wavelengths ($\lambda \lesssim 550\,$nm). Note that around $480\,$nm, we obtain the possibility to invert the main scattering direction by simply flipping the polarization from TM to TE (see Fig. \[fig:fig3\]d, bottom left or also [SI, Fig. S5]{}). By changing the NW diameter this spectral zone can be also tuned to other wavelengths ([see SI, Figs. S6-S7]{}). At longer wavelengths ($\lambda\gtrsim 700\,$nm), only the TM$_{01}$ mode exists, leading to very weak overall scattering under TE incidence and to the above mentioned, omnidirectional radiation pattern in the TM geometry. Interestingly, while TE excitation can induce uni-directional BW scattering, under TM polarization BW scattering is generally very weak and mainly FW scattering occurs as soon as higher order contributions are excited together with the TM$_{01}$ mode.

In summary, we note that although we do observe BW scattering (mainly under TE polarization) it mostly remains weak compared to the FW scattered light. This has been also observed in the case of 0D-particles[@fu_directional_2013; @yan_directional_2015] and can be explained with the finding that the second Kerker’s condition (describing BW scattering) .[@zambrana-puyalto_duality_2013] In the case of TM polarized illumination, the FW/BW scattering ratio is even almost exclusively $\gtrsim 1$ 