[22p-P01-1~18] 3.12 Nanoscale optical science and near-field optics

[22p-P01-5] High-Order Plasmon Coupling Excited in the Gold Nanoplate on the Gold Thin Film

〇(M2)Atene Bundo¹, Kohei Imura¹ (1.Waseda Univ.)

Keywords:plasmon coupling, high-order mode, nanoantenna

Plasmon coupling is useful because it creates an enhanced electric-field in the gap of the metallic nanostructure. However, high-order plasmon coupling has not been well clarified. In this study, we investigated the plasmon coupling between high-order plasmons excited in a triangular gold nanoplate and those in gold thin film. We found from electromagnetic simulations that the optical characteristics and the electric-field enhancement were dependent on the angle of incidence and were different even in the same in-plane mode. This implies that the form of plasmon coupling is different in each mode.