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Modulation method and product of terahertz metamaterial

A modulation method and metamaterial technology, applied in the field of metamaterials, can solve problems such as weak modulation performance of linearly polarized light, and achieve the effects of excellent modulation performance, simple modulation method and easy preparation.

Active Publication Date: 2017-12-15
HUAZHONG UNIV OF SCI & TECH
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  • Claims
  • Application Information

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Problems solved by technology

But its modulation performance for linearly polarized light is weak

Method used

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  • Modulation method and product of terahertz metamaterial
  • Modulation method and product of terahertz metamaterial
  • Modulation method and product of terahertz metamaterial

Examples

Experimental program
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Effect test

Embodiment 1

[0032] This embodiment adopts a metamaterial polarization modulation structure, which is called a chiral helical structure, and the schematic diagram of the structure is shown in Figure 4 . Figure 4 In , the length and width of the structural unit of the two-dimensional periodic array are Px and Py, respectively.

[0033] In the first layer of the metamaterial structure, it is composed of helical wires. The helical structure is located directly above the cylindrical air cavity of the PDMS substrate, and the center of the helix is ​​on the axis of symmetry of the cylindrical air cavity. The helical structure material used is gold with a thickness of 45nm. The line width of the helical structure is 2 μm, the inner radius of the helix is ​​2 μm, and the outer radius is 25 μm. The second layer is a dielectric layer, the material is PDMS, the thickness t sub is 4 μm, and the radius R of the PDMS circular membrane is 25 μm.

[0034] The polarization properties of metamaterials...

Embodiment 2

[0036] This example adopts the same structure as Example 1, but the incident wave source adopts circularly polarized light, and discusses the influence of the helical structure on circularly polarized light. The incident circularly polarized light can be divided into left-handed light and right-handed light according to the direction of rotation.

[0037] The reflective and transmissive properties of the metamaterial are regulated by changing the external pressure of the PDMS circular membrane. Specifically, when upward pressure is added, the helical structure on the circular membrane will bulge upwards, and the helical structure is a right-handed helix. When the incident light is left-handed circularly polarized light (such as Figure 7 ), due to the different handedness from the helical structure, most of the light will be reflected back; when the incident light is right-handed circularly polarized light (such as Figure 8 ), due to the same handedness as the helical struct...

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Abstract

The invention discloses a modulation method and product of a terahertz metamaterial and belongs to the field of metamaterials. The method comprises the steps that firstly, a periodic cylindrical air cavity is formed in a substrate of a PDMS material, then a flexible medium PDMS thin film is arranged above the air cavity, and the metamaterial is arranged on the PDMS thin film; then, outside pressure is added, so that the flexible medium PDMS thin film above the air cavity is protruding or sunken, then geometric parameters of the metamaterial on the PDMS thin film are changed, and finally the response to the incident terahertz wave is modulated. The invention further provides the product which achieves the modulation method. The product comprises a metamaterial structure and a PDMS substrate, the metamaterial structure is arranged on the PDMS substrate, the metamaterial comprises the PDMS thin film and a two-dimension periodic array which is arranged on the PDMS thin film, and the periodic cylindrical air cavity is formed in the PDMS substrate. The modulation method is simple and reliable, is easily controlled, and is relatively high in modulation performance of the linearly polarized beam and the circularly polarized light.

Description

technical field [0001] The invention belongs to the field of metamaterials, and more specifically, relates to a method for modulating terahertz metamaterials and its products. Background technique [0002] Metamaterials are a new type of artificial composite materials with periodic structures. Because its equivalent permittivity and magnetic permeability can be obtained through calculation and design, and then it can exhibit singular electromagnetic properties, it has attracted extensive attention from researchers. [0003] Metamaterials are generally composed of metals designed into sub-wavelength periodic array structures such as split rings, rectangular strips, and fishing nets, and embedded in insulating materials such as resins, ceramics, or oxides. At the resonant frequency, these structures have a strong coupling to the incident electromagnetic wave, and then realize the modulation of the electromagnetic wave, thereby changing its transmission characteristics. By de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/01
Inventor 余洪斌冯楚桓石樊李琦范甜甜邵建段田田朱业锦
Owner HUAZHONG UNIV OF SCI & TECH
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