Multilayer asymmetrical metamaterial capable of realizing Fano resonance enhancement

A Fano resonance and asymmetric technology, applied in the direction of electrical components, antennas, etc., can solve the problems that limit the application of Fano resonance

Active Publication Date: 2013-08-14
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few studies on the influence of multilayer metamaterials on Fano resonance, which limits the further application of Fano resonance.

Method used

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  • Multilayer asymmetrical metamaterial capable of realizing Fano resonance enhancement
  • Multilayer asymmetrical metamaterial capable of realizing Fano resonance enhancement
  • Multilayer asymmetrical metamaterial capable of realizing Fano resonance enhancement

Examples

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example 1

[0021] First, a multilayer structure (lower metal layer 3-dielectric layer 4-upper metal layer 3-oxidation layer 5) 2 is formed on a glass substrate 1 by material growth process, as shown in the attached figure 2 (a) shown.

[0022] Second, deposit SiO on the multilayer structure 2 2 film as a mask 6, as attached figure 2 (b) shown.

[0023] Then, the designed resonant cell array is transferred to the mask through the mask process, as shown in the attached figure 2 (c) shown. Among them, the structure design can adopt algorithms such as finite time domain difference method and finite element method.

[0024] Then, through an etching process, the resonant unit array 7 is prepared on the 2 material, and the resonant unit deviates from its central position while penetrating the lower metal layer-dielectric layer-upper metal layer-oxidation layer, as shown in the attached figure 2 as shown in (d)

[0025] Finally, the mask 6 is removed to obtain a multilayer asymmetric metam...

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Abstract

The invention provides a multilayer asymmetrical metamaterial capable of realizing Fano resonance enhancement. By moving resonant cells of the multilayer metamaterial away from the center positions of the resonant cells, the resonance of the electric dipoles of the resonant cells is enhanced and interacts with the resonance of the strong magnetic dipole of the metamaterial, a single Fano resonance peak in the transmission spectrum of the metamaterial is split into two asymmetrical resonance peaks and the dispersion characteristic of one resonance peak is steeper, so that the Fano resonance enhancement is realized, the technical problem that the deviation and the interval of resonance wavelength must be far more than that of resonant cavity bandwidth is solved, and the wavelength resolution of the metamaterial and the sensitivity of the metamaterial to the detection of biological sample refractive index change are improved. At the same time, by adopting the structure, the quality factor of the Fano resonance is increased with the distance of deviation of the resonant units from the center positions of the resonant units.

Description

technical field [0001] The invention relates to a multi-layer asymmetric metamaterial capable of generating Fano resonance enhancement, which can be applied to the fields of slow light, sensing, nonlinearity, optical switches and the like. Background technique [0002] Resonance phenomena are ubiquitous in nature and can be divided into Lorentz type and Fano type. Among them, the Fano resonance has an asymmetric spectral line shape, which can significantly improve the performance of surface plasmon functional devices. Metamaterials are a class of artificial structural materials that have emerged in recent years. By designing a certain resonant structure, they can generate corresponding couplings with external electromagnetic fields, thereby obtaining singular electromagnetic properties. With the in-depth study of metamaterials, the Fano resonance of metamaterials has also attracted much attention. As reported in Document 1: "B. Luk'yanchuk et al, NATURE MATERIAL, 2010(9): ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q15/00
Inventor 曹暾
Owner DALIAN UNIV OF TECH
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