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A Dielectric Metasurface Based on Angle Scanning Enhanced Absorption of Infrared Spectrum

An infrared spectrum absorption and angle scanning technology, applied in the field of medium metasurface, can solve the problems of low perception performance, weak interaction between light and matter, unfavorable and accurate identification, etc.

Active Publication Date: 2021-05-07
LISEN OPTICS SHENZHEN CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] An embodiment of the present invention provides a dielectric metasurface based on angular scanning to enhance infrared spectral absorption, aiming to solve the problem of the gap between light and matter when measuring trace substances in the existing infrared fingerprint detection technology because the thickness of the sample is usually smaller than the mid-infrared wavelength. The interaction is very weak and the perceptual performance is extremely low, which is not conducive to the problem of accurate identification

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  • A Dielectric Metasurface Based on Angle Scanning Enhanced Absorption of Infrared Spectrum
  • A Dielectric Metasurface Based on Angle Scanning Enhanced Absorption of Infrared Spectrum
  • A Dielectric Metasurface Based on Angle Scanning Enhanced Absorption of Infrared Spectrum

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Embodiment 1

[0033] see figure 1 , the dielectric metasurface based on angular scanning enhanced infrared spectrum absorption, including: the lower metal layer 1, the middle substrate layer 2, the upper dielectric grating 3 and the upper conformal compound 4; the lower metal layer 1 and the middle substrate layer 2 from the bottom And the upper compound is formed; the upper layer dielectric grating 3 is periodically and evenly distributed on the middle layer substrate layer 2; the upper layer conformal compound 4 is evenly coated on the middle layer substrate layer 2 and the upper layer dielectric grating 3 when scanning through the light source at a preset angle surface.

[0034] In the embodiment of the present invention, the angle range of the preset angle is 10°-65°.

[0035] As an embodiment of the present invention, the lower metal layer 1, the intermediate substrate layer 2, and the upper dielectric grating 3 form a metasurface unit structure; wherein, the lower metal layer 1 is go...

Embodiment 2

[0044] In the embodiment of the present invention, when the upper conformal compound 4 is hexagonal boron nitride (h-BN), the thickness t of the intermediate substrate layer 2 2 is 1.78μm, the thickness t of the upper dielectric grating 3 3 is 1 μm, the period p of the upper dielectric grating 3 is 4.9 μm, and the width w of the upper dielectric grating 3 is 2.16 μm.

[0045] Figure 3a is the n-k value curve of the structural parameter of the dielectric metasurface coated with hexagonal boron nitride (h-BN), Figure 3b Angular scan and envelope reflectivity curves of dielectric metasurfaces coated with hexagonal boron nitride (h-BN) provided for embodiments of the present invention. pass Figure 3a and Figure 3b It can reflect the performance of the dielectric metasurface structure itself. The dielectric metasurface structure coated with hexagonal boron nitride (h-BN) is scanned from an angle range of 10° to 65°. In a series of reflectivity curves scanned according to th...

Embodiment 3

[0048] In the embodiment of the present invention, when the upper conformal compound 4 is cubic boron nitride (c-BN), the thickness t of the intermediate substrate layer 2 2 is 2 μm, the thickness t of the upper dielectric grating 3 3 is 1 μm, the period p of the upper dielectric grating 3 is 6.5 μm, and the width w of the upper dielectric grating 3 is 2.16 μm.

[0049] refer to Figure 5a , 5b Therefore, the dielectric metasurface structure coated with cubic boron nitride (c-BN) is scanned from an angle range of 10° to 65°, and the minimum value of the spectral reflectance is selected to form Envelope curves for computing molecular fingerprints.

[0050] In the embodiment of the present invention, the above method of calculating the molecular fingerprint is to calculate the molecular fingerprint through a simulation experiment, and the specific calculation method has no influence on the realization of the functions of the present invention, so it will not be repeated here....

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Abstract

The present invention relates to the field of metamaterials, and provides a dielectric metasurface based on angular scanning to enhance infrared spectrum absorption. The dielectric metasurface includes: a lower metal layer, an intermediate substrate layer, an upper dielectric grating, and an upper conformal compound; The lower metal layer and the intermediate substrate layer are compositely formed from bottom to top; the upper dielectric grating is periodically and evenly distributed on the intermediate substrate layer; the upper conformal compound passes through the light source at a preset angle During scanning, it is uniformly coated on the substrate layer of the middle layer and the surface of the upper dielectric grating. The dielectric metasurface based on angle scanning enhanced infrared spectrum absorption provided by the embodiment of the present invention can not only increase the interaction between light and matter, but also effectively improve the perception performance of matter when using the dielectric surface for trace detection. Improved detection accuracy.

Description

technical field [0001] The invention belongs to the field of metamaterials, in particular to a dielectric metasurface based on angle scanning to enhance infrared spectrum absorption. Background technique [0002] In real life, some compounds are highly similar in form and structure, and are difficult to distinguish with the naked eye, such as hexagonal boron nitride (h-BN) and cubic boron nitride (c-BN), but their functions and values ​​are very different , therefore, it is necessary to accurately distinguish compounds with similar shapes. At the same time, there are some colorless and transparent liquids, such as perfluoropolyether, whose composition is difficult to accurately judge only by appearance characteristics, and composition analysis is very cumbersome. Therefore, a simple and convenient method for molecular detection is urgently needed. The spectral range of mid-infrared spectroscopy is 2.5 μm-25 μm. Since the structural vibration modes of molecules have differen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/35
CPCG01N21/35
Inventor 朱锦锋谢奕浓李法君刘雪莹
Owner LISEN OPTICS SHENZHEN CO LTD