A Tunable Optical Switch Based on Array Plasma Columns

A plasma and plasma technology, applied in the field of tunable optical switches, can solve the problems of small adjustable degree of freedom and uncontrollable Fano resonance frequency

Active Publication Date: 2022-07-08
GUILIN UNIV OF ELECTRONIC TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is the uncontrollable Fano resonance frequency in the prior art and the small technical problem of the adjustable degree of freedom when the Fano resonance is adjusted through geometric parameters, so that the optical switch can be used without changing the structural geometric parameters. Realize the continuous dynamic adjustment of the formant under the circumstances, and realize the multi-threshold optical switch

Method used

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  • A Tunable Optical Switch Based on Array Plasma Columns
  • A Tunable Optical Switch Based on Array Plasma Columns
  • A Tunable Optical Switch Based on Array Plasma Columns

Examples

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Embodiment 1

[0023] This embodiment provides a tunable optical switch based on an array plasma column, such as figure 1 , including: a metasurface with a thickness smaller than the working wavelength, the metasurface is a regular geometric shape, and at least 3 plasma columns are distributed in parallel and equidistantly in the metasurface;

[0024] The Mie scattering coefficient of a single plasma column is obtained by using the Mie scattering theory, and the interference between the Mie scattering of a single plasma column and the Bragg scattering generated by the array plasma column produces a Fano resonance phenomenon;

[0025] The material of the metasurface is cladding quartz tube and plasma column.

[0026] Specifically, the metasurface is rectangular, and the geometric parameters of all plasma columns are exactly the same.

[0027] Specifically, the geometric parameters of the metasurface, the radius r of the quartz tube 1 =1.0mm plasma radius r 1 =0.66mm metasurface period p = ...

Embodiment 2

[0041] This embodiment is based on implementation 1, and the established parameters are d=3.9mm, r 1 =1.0mm,r 2 =0.66mm,n e =2.0×10 12 cm -3 At the same time, the simulation software based on the finite element method is used for numerical and analytical calculation of the period p, and the results are as follows Figure 5 , is the relationship between the transmission coefficient and the frequency when the parameter p changes.

[0042] Figure 5 It shows that when 10.0mm

Embodiment 3

[0044] This example is based on Example 1, and establishes parameters p=18.0mm, r 1 =1.0mm,r 2 =0.66mm,n e =2.0×10 12 cm -3 At the same time, the simulation software based on the finite element method is used for numerical and analytical calculation of d. The results are as follows Image 6 , is the relationship between the transmission coefficient and the frequency when the parameters are changed.

[0045] Image 6 It shows that with the increase of d, the resonance frequency redshifts, but the redshift trend of 2.0mm

[0046] It can be seen from the above embodiments that the resonance frequency of the Fano resonance can be tuned by changing the geometric parameters, but the tuning frequency range is far less than the tuning frequency range obtained by changing the plasma density, which is convenient.

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Abstract

The invention relates to a tunable optical switch based on an array plasma column, which solves the technical problems of uncontrollable Fano resonance frequency and small adjustable degree of freedom when the Fano resonance is adjusted by geometric parameters, so that the optical switch can Continuous dynamic adjustment of the resonance peak without changing the structural geometric parameters, realizing multi-threshold optical switching, by using a metasurface including a thickness smaller than the working wavelength, the metasurface is a regular geometric shape, and the metasurface is parallel and equally spaced. There are at least 3 plasma columns; the material of the plasma column is a cladding quartz tube and filled inert gas; the Mie scattering coefficient of a single plasma column is obtained by using the Mie scattering theory to determine the Mie resonance frequency, and then the plasma is arrayed Bragg scattering is obtained by the column, and the technical solution of making the Mie scattering and Bragg scattering interfere to generate the Fano resonance phenomenon can better solve the problem and can be used in the field of optical switches.

Description

technical field [0001] The invention relates to the field of optical switches, in particular to a tunable optical switch based on an array plasma column. Background technique [0002] Fano resonance is formed by the mutual interference of the broad spectrum of continuous state and the narrow spectrum of discrete state to form its asymmetric ultra-sharp line shape, which is widely used in sensors, optical switches and biosensing fields. The electromagnetic wave passes through the photonic crystal, and the photonic band gap is formed by Bragg scattering, which makes it possible to manipulate the light path. The plasma photonic crystal is formed by the periodic arrangement of the plasma to form a photonic crystal structure. By changing the density of the plasma, the dielectric constant of the plasma can be changed. The purpose of changing the frequency of the photonic band gap is realized, and dynamic tunability is realized. [0003] In the prior art, there are technical probl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/00
CPCG02B5/008
Inventor 李琦杨天波傅涛安银冰孙堂友肖功利陈永和张法碧刘兴鹏李海鸥
Owner GUILIN UNIV OF ELECTRONIC TECH
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