Plasmonic Fano resonances in compositional heterogenous Al- Au nanorod dimers

5th International Conference on Advances in Optoelectronics and Micro/Nano-optics

Wu, Botao^1 ; Xue, Yingxian^1 ; Ma, Qiang^1 ; Ding, Chengjie^1 ; Rong, Youying^1 ; Liu, Yan^1 ; Chen, Lingxiao^1 ; Wu, E.^1 ; Zeng, Heping^1

State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai

200062, China^1

关键词: Destructive interference;    Extinction spectra;    High sensitivity;    Local surface plasmon resonances;    Plasmon resonances;    Plasmonic sensing;    Structural dimensions;    Surrounding environment;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/680/1/012016/pdf
DOI  :  10.1088/1742-6596/680/1/012016

来源: IOP

【 摘 要 】

We have investigated theoretically the plasmon resonance coupling in compositional heterogenous Al-Au nanorod dimers organized in a close proximity by end-to-end. It has been proved that the destructive interference between the bright dipole mode from Al nanorod and the dark quadrupole mode from Au nanorod nearby results in the appearance of apparent Fano resonance in the extinction spectra. The Fano resonance response on the structural dimension modifications in the proposed nanorod dimers have been estimated and determined. The Al-Au heterogeneous nanorod dimer shows a high sensitivity to the surrounding environment with a local surface plasmon resonance figure of merit of 7.6, which enables its promising applications in plasmonic sensing and detection.