Nonlocal Absorption in Gold and Silver Nanostructures

doi:10.19596/j.cnki.1001-246x.8211

Abstract

Abstract: Nonlocal absorption of gold and silver nanostructures is studied with ADE-FDTD method. A Drude-Lorentz model of metal material is discretized and iterative coefficients are deduced in detail. Absorption characteristics of one-, two- and three-dimensional gold and silver nanostructures are studied. It shows that the nonlocal layered films conforms to the equivalent medium theory. In one- and two-dimensional cases, nonlocal absorption peaks are related to the nano scale and have no relation with the material. The nonlocal absorption properties of three-dimensional nanostructures are related to nanoscale, and to material as well. Nonlocal effect of three-dimensional nano structures is the strongest, and the blue shift of the absorption peak is larger. Therefore, three-dimensional gold and silver nano structures are expected to play a role in nano devices.

Key words: FDTD, nonlocal, absorption, gold and silver nanostructure

CLC Number:

O485

LIU Jianxiao, LIU Xiaolan, LU Huali, GAO Yingjie, JIANG Yan, TANG Wanchun. Nonlocal Absorption in Gold and Silver Nanostructures[J]. Chinese Journal of Computational Physics, 2021, 38(2): 206-214.

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