Abstract

We demonstrate that the electric and magnetic resonances of silicon nanoparticles can be tailored by an ultrathin electric conductive coating layer that is usually involved in the conventional scanning electron microscope (SEM) characterization. By utilizing three typical electric conductive coatings, including gold (Au), platinum (Pt), and graphite (C), we show that the electric dipole resonance of the silicon nanoparticle will be broadened, while the strength of magnetic resonances will be significantly reduced. In particular, we find that the unidirectional Fano resonant scattering occurs when a 9 nm Au coating is applied as well as the near annihilation of magnetic dipole resonance with only 9 nm Pt or C coating. It is therefore shown that silicon nanoparticles would not properly work at their designed optical properties after such a precoating for conventional SEM characterization. Our results might be helpful in bridging the gap between theoretical and experimental results in the study of resonant dielectric nanostructure and provide a strategy to engineer the optical properties of silicon nanoparticles.

© 2017 Optical Society of America

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