sharp features with unity FW/BW scattering ratio, due to guided modes along the NW width. Again, this isotropic scattering can be triggered by switching the incident polarization between TE and TM. Our results open perspectives for various applications where directional guiding of light is required at a nano scale. dielectric nanowires may be used for example for in field-enhanced spectroscopies . light harvesting applications in photovoltaics.

Methods
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Crystal Growth of Cylindrical SiNWs {#sec:methods_vls_sinws}
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The cylindrical silicon nanowires were grown in a hot-wall reduced pressure chemical vapor deposition system via the Vapor-Liquid-Solid (VLS) process. Au droplets were used as catalysts, their sizes can be easily controlled and define the diameter of the nanowires. The reactor pressure was $4.5\,$Torr, as precursor for the Si growth silane (SiH$_4$) was used, diluted with hydrogen as carrier gas. More details can be found in reference . Subsequent to the expitaxy, the grown SiNWs were removed from the substrate by careful sonication in isopropyl alcohol solution. For the scattering experiments the NWs were finally drop-coated onto a transparent glass substrate with lithographic markers. A second sample was prepared on a silicon substrate for scanning electron microscopy, on which we determined a dispersion in NW 