Metallic particle annular structure, insulator-coated metallic particle annular structure and composition

The purpose of the present invention is to provide a novel metallic particle annular structure capable of three-dimensionally functioning as a metamaterial. This metallic particle annular structure (C) is characterized by including: an insulating support (B) composed of a particle connecting structure in which a plurality of particles are connected; and a plurality of metal particles (A) disposedannularly around the insulating support (B). 本发明的目的在于提供一种能够三维地作为超材料发挥功能的新型的金属颗粒环状结构体。本发明的金属颗粒环状结构体(C)的特征在于，其具备：由复数个颗粒连结而成的颗粒连结结构体构成的绝缘性支撑体(B)、和以环状配置在该绝缘性支撑体(B)的周围的复数个金属颗粒(A)。