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Sensor with three-aperture structure

A technology of sensors and apertures, which is applied in the field of sensors, can solve the problems of large spectral width and poor sensor performance, and achieve the effect of increasing wavelength resolution

Pending Publication Date: 2018-12-21
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is the technical problem that the sensor performance of the three-hole slit structure in the prior art is poor and the spectral width needs to be large

Method used

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Embodiment 1

[0023] This embodiment provides a sensor with a three-hole slit structure, such as figure 1 , including a square metasurface, the material of the square metasurface is gold / silver / copper and other metals, and three identical and symmetrical rectangular holes are arranged in parallel in the square metasurface.

[0024] Among them, this embodiment is defined as follows:

[0025] The length of the rectangular holes is h, the width is w, and the distance between the rectangular holes is d. figure 1 It is a two-dimensional structure, the sensor side length of the three-hole slit structure is p, and the electromagnetic wave incident wave vector k is along the -z direction. The electromagnetic wave incident from the air unit forms the transmission situation of the wave in two different media. The electromagnetic wave is incident along the wave vector k, the electric field E is along the x-axis direction, and the magnetic field H is located on the yoz plane and is perpendicular to th...

Embodiment 2

[0030] In this embodiment, a sensor model structure with a three-hole structure with parameters h=30 μm, w=6 μm, p=50 μm, and t=1 μm is established on the structure of embodiment 1, and the parameter d is simulated step by step.

[0031] Using simulation software based on finite element method to carry out numerical and analytical calculations, the results are as follows image 3 , is the relationship between transmission coefficient and frequency when the parameter d changes.

[0032] image 3 In , the relationship between the transmission coefficient and the frequency at different d is characterized: there is an obvious Fano resonance phenomenon at different d, the frequency of the transmission valley changes with the change of d, and the position of the transmission valley appears almost linear red shift (Fig. Indicated by Dip and black dotted line): That is, d increases, and the transmission valley frequency decreases.

[0033] Additionally, from image 3 It can be seen...

Embodiment 3

[0037] In this embodiment, a sensor model structure with a three-hole structure with parameters w=6 μm, d=10 μm, p=50 μm, and t=1 μm is established on the structure of embodiment 1, and the parameter h is simulated step by step.

[0038]Using simulation software based on finite element method to carry out numerical and analytical calculations, the results are as follows Figure 4 , which is the graph of transmission coefficient versus frequency.

[0039] Figure 4 The transmission coefficient versus frequency plots for different h are characterized. Such as Figure 4 , is the transmission characteristic relationship between h and the resonant frequency. With the change of h, the red shift of the transmission valley of the Fano resonance occurs (indicated by Dip and dotted line in the figure), and the red shift of the position of the transmission peak appears with the increase of h (indicated by Peak and the solid line in the figure), the above rule In turn, it shows that t...

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Abstract

The invention provides a sensor with a three-aperture structure. An asymmetric response spectrum line shape with steep is produced by using mutual effect of explicit mode resonance and implicit mode resonance of three dipole resonance units of the structure, thereby designing the sensor with the three-aperture structure possessing a Fano resonance phenomenon transmission spectrum. Under the same switch contrast, the wavelength shift or interval reuiqred by the asymmetric response spectrum line shape is less than the spectral width of the symmetric Lorenz-like line shape obtained by a single resonant cavity, and the wavelength resolution of a wave-division multiplexer and the sensitivity of the biosensor can be increased. The red shifts in different degrees of the Fano peak occur in the transmission spectrum by controlling geometric parameters of the structure, thereby realizing the tuning of the Fano resonance; the resonant frequency band change in the sensor can be realized by changing the scale of the structure parameters in equal proportion by adopting scaling theorem, namely, the working band is not limited to the THz band; the sensor can be used for the wave-division multiplexer, an optical switch, the biosensor and like fields.

Description

technical field [0001] The invention relates to the field of sensors, in particular to a sensor with a three-hole slit structure. Background technique [0002] Fano resonance is a kind of resonance phenomenon, which has an asymmetric spectral line shape, which can significantly improve the sensing performance of the device. In recent years, artificial electromagnetic metamaterials have attracted widespread attention in the field of electromagnetics. Among them, artificial electromagnetic metamaterials The Fano resonance of metamaterials has become a new hotspot in this field. Fano resonance is an important resonance characteristic in metamaterials. It is formed by the mutual interference of broad-spectrum bright mode and narrow-spectrum dark mode. Dark mode is also called sub-radiation mode. The natural frequency of the sub-resonance, so that the excited electromagnetic wave cannot be directly coupled with the dipole; the bright mode is also called the super-radiation mode,...

Claims

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Application Information

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IPC IPC(8): G01D5/353
CPCG01D5/35306G01D5/35387
Inventor 李琦刘飞傅涛李海鸥张法碧陈永和肖功利孙堂友
Owner GUILIN UNIV OF ELECTRONIC TECH
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