Tunable Plasmon Resonance in Ag-Au Split-Ring Resonator with Inner Metallic Cross Heterogeneous Dimer Array

Xin Zhou,Shuangchun Wen,Jun He,Diwu Yang,Bin Tang

doi:10.1155/2015/568513

Xin Zhou, Shuangchun Wen + Show 3 more

Open Access

https://doi.org/10.1155/2015/568513

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Abstract

The plasmon resonance behavior in Ag-Au split-ring resonator (SRR) heterogeneous dimer array has been investigated numerically by using the finite difference time domain (FDTD) method. The resonance dips were tuned with the metallic SRR dimer arrays constituted by different metals. For the Ag-Au heterogeneous SRRs dimer array, with the arms of metallic cross lengths increasing, the resonance dips in the visible region red shifted but the locations of resonance modes in the near-infrared region kept immovability. On the contrary, the locations of resonance dips in the visible region kept immovability but the resonance modes in the near-infrared region red shifted obviously with the air cuts widths decreasing. The whole resonance dips exhibited a red-shift as the environmental dielectric constants increase. The electric and magnetic field distributions of certain resonance wavelengths were also investigated.

Highlights

In recent years, metamaterials researches have attracted an enormous amount of attention [1,2,3]
Motivated by the above researches, in this paper, we proposed the Ag-Au split-ring resonator with inner metallic cross heterogeneous dimer array with different metal compositions, arms of metallic cross lengths, widths of air cuts, and environmental dielectric constants
Plasmon Resonance in split-ring resonator (SRR) Arrays Constituted by Different Metals

Summary

Introduction

Metamaterials researches have attracted an enormous amount of attention [1,2,3]. Motivated by the above researches, in this paper, we proposed the Ag-Au split-ring resonator with inner metallic cross heterogeneous dimer array with different metal compositions, arms of metallic cross lengths, widths of air cuts, and environmental dielectric constants. The simulated numerical results showed that the resonance modes can be tuned by different metal compositions of the SRR dimer arrays. For the Ag-Au heterogeneous SRRs dimer array, along with the arms of metallic cross lengths increasing, the resonance dips in the visible region red shifted but the locations of resonance modes in the near-infrared region kept immovability. The time-dependent near field and transmission spectra of the SRR dimer structure were calculated by using twodimensional finite-difference time domain (FDTD) method [35]. Perfectly matched layer (PML) absorbing boundary condition and periodic boundary condition were applied along the x- and y-axes, respectively

Structure and Simulation Method

Results and Discussion

Conclusions