Local rotational symmetry effects on Fano resonances with constant non-resonant transmission channel

In this work, we have carried out a systematic study on the optical properties of gold nano-octahedra via numerical simulations. We obtained broadening scattering spectra dominated by a hybridized bonding mode originated from the interaction between intrinsic plasmon modes when increasing the size of gold nano-octahedra in vacuum. Once placing the nano-octahedra on a high refractive index dielectric substrate, a Fano dip can be induced in the scattering spectra due to the mutual interference between a dipolar mode and a quadrupolar mode. Moreover, we found that the interference become stronger by increasing the refractive index in substrate, and the broadening scattering spectra split into two hybridized modes in a single gold nano-octahedron: the anti-bonding mode and the bonding mode. Our results for the first time give a clear description of the complex plasmonic properties of a gold nano-octahedron and provide insights in designing appropriate nano-octahedral structures for applications.

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Plasmon Modes and Substrate-Induced Fano Dip in Gold Nano-Octahedra

Zhu

Yang

Chen

et al. 2015

Plasmonics

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Local rotational symmetry effects on Fano resonances with constant non-resonant transmission channel

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References 32 publications

Plasmon Modes and Substrate-Induced Fano Dip in Gold Nano-Octahedra

Plasmon Modes and Substrate-Induced Fano Dip in Gold Nano-Octahedra

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