A theoretical study of a plasmonic sensor comprising a gold nano-disk array on gold film with a SiO<sub><b>2</b></sub> spacer

A theoretical study of a plasmonic sensor comprising a gold nano-disk array on gold film with a SiO₂ spacer

Wang Xiangxian^{1, †}, Zhu Jiankai¹, Tong Huan¹, Yang Xudong¹, Wu Xiaoxiong¹, Pang Zhiyuan¹, Yang Hua¹, Qi Yunping²

(a) A schematic diagram of the composite structure, consisting of a perfect gold nano-disk square array on a gold film, with a SiO₂ spacer (the red arrow indicates the direction of propagation and the blue arrow indicates the polarization direction). (b) A top-down view of the structure. The black foursquare lattice is the calculation unit and the red line is the period.