Enhancement of efficiency for broadband unidirectional light scattering by core-shell nanoantennas

被引：0

作者：

Wang, Weimin ^{[1
]}

Wang, Xiaoyue ^{[1
]}

Huang, Biqun ^{[1
]}

Jing, Xufeng ^{[1
]}

Li, Chenxia ^{[1
]}

机构：

[1] China Jiliang Univ, Inst Optoelect Technol, Hangzhou 310018, Peoples R China

来源：

OPTICA APPLICATA | 2019年 / 49卷 / 04期

基金：

中国国家自然科学基金;

关键词：

nanoparticles; core-shell nanocube; particle chains; broadband unidirectional scattering; METAMATERIALS; POLARIZATION; PLASMONICS; PARAMETERS; DESIGN;

D O I：

10.37190/oa190410

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A core-shell nanocube antenna is proposed to numerically simulate broadband unidirectional scattering. Comparing the scattering of a dielectric nanocube and core-shell nanocube, it is found that the core-shell nanocube has a higher forward/backward ratio and better unidirectional scattering efficiency. In order to further enhance forward scattering efficiency and reduce the side-lobe of scattering, the particle chain of core-shell nanocubes is proposed by arranging multiple nanoparticles. It is possible to achieve better unidirectional scattering over a wide spectral range. In addition, we also numerically studied the effect of the gap between the particles and the radius of the metal core on unidirectional scattering. It is demonstrated that the optimal gap should be selected to achieve ideal unidirectional forward scattering. The unique optical properties of core-shell nano cubes have important practical applications particularly in the fields of nano antennas, photovoltaic devices, and nanolasers that require reflection suppression.

引用

页码：655 / 667

页数：13

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