High-<i>Q</i> and Intense Lattice Plasmon Resonance in Hexagonal Nonclose Packed Thin Silver Nanoshells Array
Ping Gu, Huang-jian Yang, Danqi Li, Haiqiang Zhu, Jing Chen, Zuxing Zhang, Zhendong Yan, Chaojun Tang, Fanxin Liu, Zhuo Chen
Abstract
We theoretically demonstrate a high- Q and intense lattice plasmon resonance supported by the hexagonal nonclose packed thin silver nanoshells array. By introducing the diffraction coupling mechanism, the high- Q and intense lattice plasmon mode stemmed from the coupling between the TM 1 cavity plasmon mode and the diffraction mode of the first-order Wood anomaly is obtained in the thin silver nanoshells array, successfully solving the trade-off between the Q -factor and the resonance intensity of the cavity plasmon mode existed in a single silver nanoshell. In particular, a maximum Q -factor up to 610 of the lattice plasmon resonance is successfully achieved at 870 nm in the silver nanoshell array with an optimal silver thickness of 20 nm.