Unidirectional light scattering by up-down Janus dimers composed of gold nanospheres and silicon nanorods
Unidirectional light scattering by up-down Janus dimers composed of gold nanospheres and silicon nanorods
复制标题
由金纳米球和硅纳米棒组成的上下Janus二聚体的单向光散射
DOI：
10.1016/j.optcom.2018.11.055
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发表时间：
2019
影响因子：
2.4
通讯作者：
Li Dongsheng
中科院分区：
文献类型：
--
作者：
Lei Ye;Yuan Meng;Yang Deren;Li Dongsheng
In this paper, a time-domain finite-difference (FDTD) method is used to simulate the scattering properties of a Janus dimer that a gold nanosphere is putted on the top of a silicon nanorod. We have demonstrated that the Janus dimer exhibits unidirectional scattering in the whole wavelength region of the sunlight. The unidirectionality of the dimer will improve with the height increase of the silicon nanorod and the gap decrease between two adjacent dimers. In our simulation, the forward-to-backward ratio (F/B) of the Janus dimer calculated dividing forward scattering spectra by backward scattering spectra can achieve the maximum of 20 when the height of silicon nanorod is 300 nm. What is more, we have applied the Janus dimers to amorphous silicon thin-film solar cells as antireflection structures. The reflectivity of the solar cells reduces by 39.40% and the short circuit current density improves by 5.04% than those of the reference. Therefore, the Janus dimers has a great application prospect in photovoltaic devices.
