Effect of incident angles and polarizations on forward light scattering of silicon nanoparticles on arbitrary substrates

초록

Resonant scattering from metallic nanoparticles, which is dominated by electric resonant modes, has gained noticeable attention in a variety of research areas, such as solar cells, on-chip interconnects, spectroscopic systems, and plasmonic color displays. However, intrinsic losses of the metallic nanoparticles at optical frequencies degrade the performance and impose practical limitations. Considerable attention has been drawn to dielectric nanoparticles due to their capability to support both electric and magnetic resonances, and it has been demonstrated that strong electric and magnetic resonant modes can be achieved by using high-index dielectric nanoparticles. Strong forward scattering with nearly zero backward scattering has been proposed and experimentally demonstrated by interference between the electric and magnetic resonances, easily manipulating the directionality of the scattering and thus opening up diverse potential applications. Various researches have been performed to find the optimum forward light scattering by controlling a shape of the dielectric nanoparticles and employing metallic-dielectric core-shell nanoparticles. However, effects of incident angles and polarization states on the forward light scattering of the dielectric nanoparticles in the presence of a substrate have remained largely unstudied.