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Wideband terahertz molecular fingerprint trace detection optical grating based on angle multiplexing

A multiplexing, molecular fingerprinting technology, applied in the field of gratings, can solve the problems of light and detection material interaction interference, large inherent metal damping, and low trace detection accuracy.

Active Publication Date: 2020-06-02
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The embodiment of the present invention provides a broadband terahertz molecular fingerprint trace detection grating based on angle multiplexing, which aims to solve the problem that the existing detection method has a large inherent metal damping, and the interaction between light and the detection substance is limited by the metal. The absorption interference is very strong, so the accuracy of trace detection is not high

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  • Wideband terahertz molecular fingerprint trace detection optical grating based on angle multiplexing
  • Wideband terahertz molecular fingerprint trace detection optical grating based on angle multiplexing
  • Wideband terahertz molecular fingerprint trace detection optical grating based on angle multiplexing

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Embodiment 1

[0033] see figure 1 , a broadband terahertz molecular fingerprint trace detection grating based on angle multiplexing, the detection grating includes: a metal layer 1, a substrate layer 2, a grating layer 3 and a conformal layer 4; wherein, the metal layer 1 and the substrate layer 2 Composite formation from bottom to top; the grating layer 3 is periodically and evenly distributed on the substrate layer 2; the conformal layer 4 is evenly coated on the surface of the substrate layer 2 and the grating layer 3 when the light source scans and detects the grating through a preset dynamic angle .

[0034] As an embodiment of the present invention, the metal layer 1, the substrate layer 2 and the grating layer 3 form a dielectric grating unit structure, the material of the metal layer 1 is aluminum (Al), the material of the substrate layer 2 is polymethylethylene (TPX), The material of the grating layer 3 is polyethylene (PE).

[0035] In the embodiment of the present invention, th...

Embodiment 2

[0043] In the embodiment of the present invention, the above-mentioned dielectric grating unit structure includes: uniformly coating 1 μm thick α-lactose on the surface of the substrate layer 2 and the grating layer 3 to form a conformal layer 4; the thickness of the substrate layer 2 is t 2 is 120 μm, the thickness t of the grating layer 3 3 is 85 μm, the period p of the grating layer 3 is 400 μm, and the width w of a single grating is 180 μm.

[0044] Figure 3aThe n-k value curve diagram of the structural parameters of the detection grating coated with α-lactose provided by the embodiment of the present invention, Figure 3b The angular scanning curve, the absorption peak envelope curve and the unstructured absorption curve of the detection grating coated with α-lactose provided in the embodiment of the present invention, through Figure 3a and Figure 3b It can reflect the performance of the dielectric grating structure itself, and there are obvious resistance parts and...

Embodiment 3

[0047] see Figure 4a , 4b , in the embodiment of the present invention, the above-mentioned dielectric grating unit structure includes: uniformly coating 1 μm thick 2,4-dinitrotoluene (2,4-DNT) on the surface of the substrate layer 2 and the grating layer 3 to form a conformal layer 4 ;The thickness of the substrate layer t 2 is 35.5μm, the thickness of the grating layer t 3 is 25 μm, the period p of the grating layer is 195 μm, and the width w of a single grating is 61 μm.

[0048] according to Figure 4a and Figure 4b It can be seen that the imaginary part of the refractive index of the detection grating coated with 1 μm thick 2,4-dinitrotoluene (2,4-DNT) has an obvious absorption peak at 1.075 THz. According to the envelope formed by a series of curves that can be obtained by scanning the detection grating at a preset dynamic angle, that is, an angle of 10° to 56°, it can be seen that there is an obvious absorption peak at 1.075 THz. Compared with the results of non...

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Abstract

The invention relates to the technical field of optical gratings, and provides a wideband terahertz molecular fingerprint trace detection optical grating based on angle multiplexing. The detection optical grating includes a metal layer, a substrate layer, an optical grating layer and a conformal layer; the metal layer and the substrate layer are compositely formed from bottom to top; the optical grating layer is periodically and uniformly distributed on the substrate layer; and the conformal layer uniformly coats the surfaces of the substrate layer and the optical grating layer when a light source scans a detection optical grating through a preset dynamic angle. The wideband terahertz molecular fingerprint trace detection optical grating based on the angle multiplexing provided by the embodiments of the invention can not only increase the interaction between light and substances when trace detection is performed, but also effectively improve the perception performance to a substance tobe measured, thereby improving the accuracy of detection.

Description

technical field [0001] The invention belongs to the technical field of gratings, in particular to a broadband terahertz molecular fingerprint trace detection grating based on angle multiplexing. Background technique [0002] Many complex molecules possess intra- or intermolecular rotational or vibrational modes at terahertz frequencies, which can be characterized by prominent features in the absorption spectrum. Due to the non-destructive nature of terahertz detection, it holds great promise in biological and security sensing applications. However, because the molecules to be detected are relatively small in size compared to THz wavelengths, which leads to very weak interactions between the molecules to be detected and THz waves, it is usually required that the sample has a large volume and can observe THz waves. Hertzian absorption fingerprints can be used for molecular identification. However, in the detection of trace molecules, the wavelength mismatch and the lack of p...

Claims

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Application Information

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IPC IPC(8): A61B5/1172A61B5/05
CPCA61B5/0507A61B5/1172
Inventor 朱锦锋李法君江山谢奕浓刘雪莹
Owner XIAMEN UNIV
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