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Ultra-narrow-band electromagnetic wave asymmetric transmission super-structure device

An asymmetric and electromagnetic wave technology, which is applied in the field of artificial electromagnetic materials and terahertz science, can solve problems such as the inability to realize asymmetric transmission of electromagnetic waves with a single frequency, and achieve the effect of asymmetric transmission and high circular dichroism

Pending Publication Date: 2022-05-13
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

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Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, an ultra-narrow-band electromagnetic wave asymmetric transmission meta-device provided by the present invention introduces a new principle of the bound state in the continuum, and uses a full-dielectric rectangular asymmetric opening block as the basic unit to solve the problem of The problem that the existing technology cannot realize the asymmetric transmission of single-frequency electromagnetic waves

Method used

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  • Ultra-narrow-band electromagnetic wave asymmetric transmission super-structure device
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  • Ultra-narrow-band electromagnetic wave asymmetric transmission super-structure device

Examples

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Embodiment 1

[0024] An ultra-narrow-band electromagnetic wave asymmetric transmission meta-device, such as figure 1 As shown, rectangular asymmetric opening blocks 1 arranged periodically in N rows and M columns are connected by connectors 2; both N and M are positive integers.

[0025] Such as figure 2 and image 3 As shown, the length l of the rectangular asymmetric opening block 1 is 90 μm, the width w is 60 μm, and its long side has a square opening, the size g of the square opening is 8 μm, the distance between the center of the square opening and the geometric center of the rectangular asymmetric opening block 1 d is 18 μm.

[0026] The rectangular asymmetrical opening block 1 and the connecting piece 2 are made of high-resistance silicon with a thickness of 50 μm.

[0027] The row period constant Px and the column period constant Py of each rectangular asymmetric opening block 1 are both 160 μm.

[0028] The rectangular asymmetric opening block provided by this embodiment belon...

Embodiment 2

[0031] On the basis of the above-mentioned embodiment 1, the rectangular asymmetric opening block 1 and the connecting piece 2 are made of high-resistance silicon material with a dielectric constant of 11.9, so that the operating frequency of the device is 1.47187 THz, and the diffraction-limited frequency is 1.87 THz.

[0032] In this field, the absolute value of circular dichroism (CD), which describes the asymmetric transport properties of metasurfaces, is a function related to the bound state frequency ω 0 and radiation rate γ 0 The related functions are expressed as:

[0033]

[0034] where m 1 ,m 2 ,n 1 ,n 2 Determined by the structural parameters and not equal to each other, it represents the coupling coefficient between the circularly polarized eigenmode of the device and the external circularly polarized excitation wave. The device design of this embodiment aims to make the absolute value of CD peak at the operating frequency of 1.47187 THz, and the peak width...

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Abstract

The invention discloses an ultra-narrow-band electromagnetic wave asymmetric transmission metamaterial, which relates to the technical field of artificial electromagnetic materials and terahertz science and is formed by connecting N rows and M columns of rectangular asymmetric opening blocks which are periodically arranged through connecting pieces, n and M are positive integers. The rectangular asymmetric opening block provided by the invention belongs to an all-dielectric type, and can generate a photon bound state lower than the diffraction limit frequency of a metasurface, namely a bound state in a continuum, through asymmetric openings; on the basis, the super-surface is formed by periodic arrangement, working frequency points of the super-surface are located at frequency points determined by a bound state in a continuum, high-quality factors can be obtained, and therefore ultra-narrow linewidth is achieved. According to the invention, asymmetric transmission of single-frequency electromagnetic waves can be approximately realized; and compared with the prior art, higher circular dichroism is realized.

Description

technical field [0001] The invention relates to the fields of artificial electromagnetic materials and terahertz science and technology, in particular to an ultra-narrow-band electromagnetic wave asymmetric transmission meta-device. Background technique [0002] The function of the meta-device for asymmetric transmission of electromagnetic waves is mainly as follows: only one kind of circularly polarized wave is allowed to pass through and the reverse helical circularly polarized wave is blocked. The device can be used in many fields such as asymmetric filtering, optical anti-counterfeiting, frequency selection, space communication, sensing and biomedicine. [0003] The ideal electromagnetic wave asymmetric transmission meta-device pursues customizable operations from single frequency to broadband to meet different user needs and different usage scenarios. At present, all asymmetric transmission meta-devices have non-negligible linewidths and cannot be regarded as single-fr...

Claims

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Application Information

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IPC IPC(8): H01P3/02H01Q15/00
CPCH01P3/02H01Q15/0086Y02D30/70
Inventor 李继涛李杰岳震郑程龙
Owner 成都第三象限未来科技有限公司
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