Fano resonances in heterogeneous dimers of silicon and gold nanospheres
Fano resonances in heterogeneous dimers of silicon and gold nanospheres
复制标题
硅和金纳米球异质二聚体中的法诺共振
DOI:
10.1007/s11467-018-0746-6
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发表时间:
2018-03
影响因子:
7.5
通讯作者:
He Jun
中科院分区:
文献类型:
--
作者:
Zhao Qian;Yang Zhong Jian;He Jun
We theoretically investigate the optical properties of dimers consisting of a gold nanosphere and a silicon nanosphere. The absorption spectrum of the gold sphere in the dimer can be significantly altered and exhibits a pronounced Fano profile. Analytical Mie theory and numerical simulations show that the Fano profile is induced by constructive and destructive interference between the incident electric field and the electric field of the magnetic dipole mode of the silicon sphere in a narrow wavelength range. The effects of the silicon sphere size, distance between the two spheres, and excitation configuration on the optical responses of the dimers are studied. Our study reveals the coherent feature of the electric fields of magnetic dipole modes in dielectric nanostructures and the strong interactions of the coherent fields with other nanophotonic structures.
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