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A polarization sensitive terahertz reflection controller based on geometrical phase

A polarization-sensitive, controller technology, applied in the field of terahertz wave control, can solve the problems of a single fixed function and increase the difficulty of processing, and achieve the effect of good control effect, simple and novel control principle, and huge application value.

Inactive Publication Date: 2018-12-14
CHINA JILIANG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the common feature of these devices is that they can only work at a single frequency point or when the metasurface structure is designed, it will only have a single fixed function, and it is impossible to use a metasurface structure to achieve multiple functions.
In addition, obtaining different unit structures requires different unit structure sizes, which will increase the difficulty of processing

Method used

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  • A polarization sensitive terahertz reflection controller based on geometrical phase
  • A polarization sensitive terahertz reflection controller based on geometrical phase
  • A polarization sensitive terahertz reflection controller based on geometrical phase

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Embodiment 1

[0020] In this embodiment, the structure of a polarization-sensitive terahertz wave reflection controller based on geometric phase is as described above ( figure 1 , Figure 4 and Figure 7 ),No longer. However, in this embodiment, the specific parameters of each component are as follows: the side length of the underlying metal sheet is 60 μm, the thickness is 0.2 μm, and the electrical conductivity is 5.96×10 7 S / m; the side length of the middle polyimide layer is 60 μm, the thickness is 0 μm, the dielectric constant is 3.0, and the loss tangent is 0.03; the geometric dimensions of the two outer large fan-shaped metal blocks of the top metal structural unit are the same, where Outer radius R 1 25μm, inner radius R 3 R 3 The vertical distance L between the two inner small fan-shaped metal blocks is 15 μm; the width of the middle rectangular metal block is 5 μm and it is connected with the two outer large fan-shaped metal blocks. The simulation results of the polarization...

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Abstract

The invention discloses a polarization sensitive terahertz wave reflection controller based on geometrical phase. The controller is made up of eight superunits arranged in a certain order, in which each supercell consists of 4 * 4 identical cell structures, There are eight cell configurations, eight of which are obtained by rotating the top metal structure cell of the basic cell structure by a 22.5 degree rotation angle difference in the range of 0 degree to 157.5 degree, so that the geometrical dimensions of the eight cell configurations are identical but the reflection angle phase of the adjacent cell structures is 45 degrees. When different polarized terahertz waves are vertically irradiated on the reflective controller, the same magnitude phase gradient will be generated in different directions, so that the perpendicular incident terahertz waves can be reflected in different directions to achieve polarization sensitive characteristics. The invention has the advantages of simple andnovel control principle, good control effect and the like. The controller has great potential applications in terahertz communication, terahertz reflection imaging, beam control and so on.

Description

technical field [0001] The invention relates to the field of terahertz wave control, in particular to a polarization-sensitive terahertz wave reflection controller based on geometric phase. Background technique [0002] Metamaterials are artificial electromagnetic media composed of periodic or non-periodic subwavelength structures, which have unique properties that natural media do not have, such as negative refractive index and negative dielectric constant. With its appearance, it soon became a research hotspot in the scientific community. Many strange phenomena have been realized by using metamaterials, including strange reflections, invisibility cloaks, optical prisms, etc. In addition, with the emergence of processing technology, related metamaterial-based devices have also been developed rapidly, such as absorbers, filters, switches, modulators, etc. However, there are few reports on related devices that control the reflection of terahertz waves. [0003] With the em...

Claims

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Application Information

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IPC IPC(8): H01Q15/00
CPCH01Q15/0013H01Q15/0086
Inventor 李绍和李九生
Owner CHINA JILIANG UNIV
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