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Design method of dual-band spin selective transmission metasurface device

A device design and metasurface technology, applied to electrical components, antennas, etc., to reduce processing difficulty and save production costs

Pending Publication Date: 2021-10-19
成都第三象限未来科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art and provide a design method for a dual-band spin-selective transmission metasurface device to solve or improve the above-mentioned problems

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  • Design method of dual-band spin selective transmission metasurface device
  • Design method of dual-band spin selective transmission metasurface device
  • Design method of dual-band spin selective transmission metasurface device

Examples

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Embodiment 1

[0020] Example 1, refer to figure 1 , the design method of the dual-band spin-selective transmission metasurface device of this scheme specifically includes the following steps:

[0021] S1. Design the basic structure so that the basic structure can realize the spin-selective transmission of dual frequency bands.

[0022] S2. The basic structures designed in step 1 are arranged periodically.

[0023] The above designs are all based on high-resistance silicon with a thickness of 500 μm. The basic structure described in step 1 is an H-type medium column. In the present invention, the metasurface works in the frequency band around 1.2 and 1.6 THz, and the total thickness of silicon is t 1 +t 2 =500μm, the etching height of the dielectric column is t 2 = 200 μm, the length of the rectangular strips on both sides of the dielectric column is l 1 =70μm, width is w 1 = 22 μm and an angle of 45° with the x-axis. The center-to-center spacing of the rectangular bars on both sides...

Embodiment 2

[0024] The second embodiment specifically includes:

[0025] S1. Design the basic structure so that the basic structure can realize the spin-selective transmission of dual frequency bands. like figure 1 As shown, the basic structure is an H-type dielectric column. In the present invention, the metasurface works in the frequency band around 1.2 and 1.6 THz, and is determined by figure 1 (a) It can be seen that the total thickness of silicon is t 1 +t 2 =500μm, the etching height of the dielectric column is t 2 = 200 μm. figure 1 (b) is a top view of the unit. The length of the rectangular strips on both sides of the dielectric column is l 1 =70μm, width is w 1 = 22 μm and an angle of 45° with the x-axis. The center-to-center spacing of the rectangular bars on both sides of the dielectric column is l 2 = 90 μm, the width of the column connecting the rectangular bars on both sides is w 2 = 16 μm. The period of the entire cell is P=150 μm. like figure 2 (a), "+" and...

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Abstract

The invention discloses a design method of a dual-band spin selective transmission metasurface device. The design method comprises the following steps that: S1, based on high-resistance silicon, basic structures are designed, and the basic structures are H-shaped dielectric cylinders; and S2, the basic structures in the step S1 are arranged periodically, and the metasurface formed by the periodic arrangement of the structures realizes dual-band spin selective transmission. The invention discloses the terahertz metasurface device for realizing dual-band spin selective transmission; and the metasurface provided by the invention is made of a single-layer all-silicon material, the processing difficulty is obviously reduced, the manufacturing cost is saved, the spin selective transmission in two frequency bands can be realized, and two opposite chiral effects are realized in the two frequency bands, so that a new thought is provided for the design of the terahertz spin selective transmissive device.

Description

technical field [0001] The invention belongs to the technical field of novel artificial electromagnetic materials and terahertz science and technology, and particularly relates to a design method of a dual-band spin selective transmission metasurface device. Background technique [0002] Chirality is a special property that indicates that there is no mirror symmetry in objects, like the human left and right hands, which cannot overlap no matter how we move or rotate. These chiral structures are widely found in nature, such as amino acids, sugars, and crystals. The optical response of chiral media to circularly polarized (CP) light can be described as optical activity and circular dichroism (CD), which are widely used in medical diagnosis, communication and other fields. However, the chiral optical response of these materials is weak due to the matching of the size scale and incident light wavelength of chiral materials. [0003] To effectively enhance chiral optical respon...

Claims

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Application Information

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IPC IPC(8): H01Q15/00
CPCH01Q15/0046H01Q15/0086
Inventor 岳震李继涛李杰郑程龙
Owner 成都第三象限未来科技有限公司
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