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Depolarizer based on meta-material

A depolarizer and metamaterial technology, applied in the field of metamaterials, can solve problems such as technical complexity, and achieve the effect of easy implementation and simple structure

Active Publication Date: 2012-05-30
KUANG CHI INST OF ADVANCED TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this technique is more complex

Method used

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  • Depolarizer based on meta-material
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  • Depolarizer based on meta-material

Examples

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no. 1 example

[0030] Such as figure 1 As shown, in this example, there is only one cell whose optical axis n e1 Unlike other places, n e2 Indicates the optical axis of other cells, as can be seen from the figure, n e1 with n e2 Not parallel. figure 2 Shown is an artificial microstructure using an I-shaped structure to achieve figure 1 Optical axis plane distribution shown. In this embodiment, after the electromagnetic wave with a single polarization characteristic passes through all the cells, the optical axis is n e1 Part of the cell's electromagnetic wave polarization properties will be different from others. figure 1 It is only a schematic plan view of one sheet in this embodiment, and other sheets can be combined with figure 1 The sheets shown have the same distribution of optical axes, or they may be different, as long as the polarization characteristic of the emitted electromagnetic wave is changed. Figure 8 A schematic of the stacking of the sheets is shown.

no. 2 example

[0032] Such as image 3 As shown, in this example, the optical axis n e1 The rotated parts are at the upper left and lower right corners of the metamaterial, n e2 Indicates other optical axes, n e1 with n e2 Not parallel. Figure 4 Shown is an artificial microstructure using an I-shaped structure to achieve image 3 Optical axis plane distribution shown. In this embodiment, after the electromagnetic wave with a single polarization characteristic passes through all the cells, the optical axis is n e1 Part of the cell's electromagnetic wave polarization properties will be different from others. Similarly, image 3 It is only a schematic plan view of one sheet in this embodiment, and other sheets can be combined with image 3 The sheets shown have the same distribution of optical axes, or they may be different, as long as the polarization characteristic of the emitted electromagnetic wave is changed. Figure 8 A schematic of the stacking of the sheets is shown.

no. 3 example

[0034] Such as Figure 5 As shown, in this embodiment, such as image 3 As shown, in this embodiment, the optical axes of the refractive index ellipsoids of all the unit cells on the same layer are not parallel. Figure 6 Shown is an artificial microstructure using an I-shaped structure to achieve Figure 5 Optical axis plane distribution shown. When the incident electromagnetic wave passes through the first sheet, in different cells, its electric field can be decomposed into two mutually perpendicular electric field components in the refractive index ellipsoid of the cell (one parallel to the optical axis, one parallel to the optical axis vertical). By designing the depolarizer of the present invention so that each unit cell is anisotropic, and ensuring that the optical axis orientations of the refractive index ellipsoids of the unit cells at different positions are not the same, the polarized wave electric field of a single characteristic After the vector decomposition, ...

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Abstract

The invention relates to a depolarizer based on a meta-material. The depolarizer comprises a plurality of parallel sheet layers, wherein each sheet layer is provided with a flaky substrate and a plurality of artificial microstructures attached to the flaky substrate; each flaky substrate is partitioned into a plurality of same unit bodies; each unit body and the artificial microstructure thereon constitute a cell with an anisotropic electromagnetic property; and at least two cells with unparallel optical axes are arranged in each sheet layer. According to the depolarizer based on the meta-material disclosed by the invention, at least two cells with unparallel optical axes are arranged in each sheet layer, and the polarization characteristics of at least a part of electromagnetic waves with single polarization characteristics passing through the meta-material are changed, so that the aim of depolarizing is fulfilled; and moreover, compared with the prior art, the depolarizer has the advantages of simple structure and easiness for realizing.

Description

technical field [0001] The invention belongs to the field of metamaterials, in particular to a depolarizer based on metamaterials. Background technique [0002] The polarization of electromagnetic waves refers to the characteristic of the field vector (electric field, magnetic field) changing with time at a fixed position in space. The polarization of a wave is usually described by the trajectory of the end of the electric field strength E vector as a function of time. The polarization mode of the wave can be judged by the amplitude and phase relationship between the two orthogonal components of the electric field component of the electromagnetic wave. If the E vector vibrates in only one direction within one period, it is called a linearly polarized wave; if the trajectory of the endpoint of the E vector is an ellipse (or circle), it is called an elliptical (or circular) polarized wave. [0003] In some applications (such as electromagnetic shielding), depolarization is r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q15/24G02B5/30
CPCG02B1/002G02B5/30H01Q15/242
Inventor 刘若鹏徐冠雄季春霖任春阳
Owner KUANG CHI INST OF ADVANCED TECH
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