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 conti

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

Examples

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Example Embodiment

[0023] Example 1:

[0024]An ultra-narrow band electromagnetic wave asymmetrical transmission superstructure device, such as Figure 1 As shown, rectangular asymmetrically open block 1 arranged periodically by N rows of M columns is connected by connector 2; N and M are positive integers.

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

[0026] Rectangular asymmetrical opening block 1 and connector 2 are made of high-impedance silicon with a thickness of 50 μm.

[0027] The row-period constant Px and column-period constant Py are both 160 μm per arrangement of rectangular asymmetrical open block 1.

[0028] The rectangular asymmetrical opening block provided in the present embodiment is an all...

Example Embodiment

[0030] Example 2:

[0031] Based on the above example 1, the rectangular asymmetrical opening block 1 and the connector 2 use a high-impedance silicon material with a dielectric constant of 11.9, whereby the device operates at a frequency of 1.47187THz and a diffraction limit frequency of 1.87THz.

[0032] In the art, the absolute value of circular dichroism (CD) describing the asymmetric transmission performance of the hypersurface is a frequency ω with a bound state 0 and emissivity γ 0 Related functions, expressed as:

[0033]

[0034] where m 1 ,m 2 ,n 1 ,n 2Determined by the structural parameters, they are not equal to each other, indicating the coupling coefficient between the circularly polarized eigenmode of the device and the external circularly polarized excitation wave. The device design of the present embodiment is intended to have a spike in the absolute value of the CD at the operating frequency of 1.47187THz, and the width of the spike is negligible at the THz sc...

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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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