[13p-B409-1~17] 3.12 ナノ領域光科学･近接場光学

△ [13p-B409-13] 誘電体メタ液体の実現へ向けたコロイド状シリコンナノ粒子の開発

〇(DC)雛本 樹生¹、堀田 慎之介¹、杉本 泰¹、藤井 稔¹ (1.神戸大院工)

キーワード：ミー共鳴、プラズモニクス、メタマテリアル

Meta-atoms that support magnetic and electric dipoles at visible frequencies are key building-blocks for optical metamaterials. Recently liquid-type metamaterials, solutions in which meta-atoms are dispersed, are proposed as metafluids. In contrast to solid-state metamaterials, the liquid metamaterials can be applied to solution-phase spectroscopy and optofluidic devices to enhance signals and/or offer advanced functionalities. As a component of liquid metamaterials, a plasmonic meta-atom composed of silica core decorated with metal nanoparticles have been studied so far; however, the magnitude of the magnetic dipole (MD) is weaker than that of the electric dipole (ED) on the plasmonic meta-atom. Here we propose silicon nanospheres as a novel meta-atom that can be dispersed in solution such as water and alcohol. The silicon nanospheres exhibit strong resonant scattering by Mie-type ED and MD resonances. We show that the silicon nanosphere colloid can control effective refractive index in a wide range and are an excellent candidate for metafluids because of advantages such as low-loss, simple symmetric structure, and strong optical magnetism.