Tunable Fano Resonance Based Mode Interference in Waveguide-Cavity-Graphene Hybrid Structure

被引：14

作者：

Liu, Qiong ^{[1
]}

Liu, Mingwei ^{[1
]}

Zhan, Shiping ^{[1
]}

Wu, Lingxi ^{[1
]}

Xie, Suxia ^{[1
]}

Chen, Zhaohui ^{[1
]}

Zhang, Yichen ^{[1
]}

机构：

[1] Hunan Univ Sci & Technol, Sch Phys & Elect Sci, Xiangtan 411201, Peoples R China

来源：

PLASMONICS | 2019年 / 14卷 / 04期

关键词：

Fano resonance; Graphene; Fermi level; Figure of merit; HIGH FIGURE; SCATTERING; MULTIMODE; MERIT;

D O I：

10.1007/s11468-018-0887-z

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this paper, a graphene strip is introduced into a metal-insulator-metal (MIM)-integrated square cavity hybrid structure; the transmission spectra are theoretically investigated by the finite different time domain (FDTD) methods. An asymmetric Fano resonance dip that has high figure of merit (FOM) value appears in the transmission band. According to the multimode interference coupled mode theory (MICMT) analytical method, the Fano resonance originates from the coherent coupling between TM10 cavity magnetic mode and graphene plasmonic resonance electric mode. The center wavelength, full width at half maximum (FWHM), and FOM value of the Fano resonance can be tuned dynamically by altering the Fermi level of the graphene. Through breaking the symmetry of the hybrid structure or introducing double graphene strips with different Fermi level into hybrid structure, double Fano resonance are realized. This study can provide some theoretical basis and design reference for designing ultrahigh sensitivity plasmonic sensor.

引用

页码：1005 / 1011

页数：7

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