Super-structured material-based surface-enhanced infrared substrate and molecule detection method thereof

A surface-enhanced, infrared technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of difficult to accurately detect the imaginary part of optical constants, difficult inversion of molecular optical constants, complicated test procedures, etc., to improve the detection limit, improve sensitivity, Enhance the effect of scattered or reflected signals

Active Publication Date: 2020-02-25
XIAMEN UNIV
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Problems solved by technology

[0009] However, most of the above-mentioned methods involving optical constants have complex test procedures and low measurement accuracy, and because the molecular fingerprint vibration itself is very weak, it is diff

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  • Super-structured material-based surface-enhanced infrared substrate and molecule detection method thereof
  • Super-structured material-based surface-enhanced infrared substrate and molecule detection method thereof
  • Super-structured material-based surface-enhanced infrared substrate and molecule detection method thereof

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Embodiment Construction

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.

[0033] In describing the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", " The orientation or positional relationship indicated by "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, so as to Specific orientation configurations and operations, therefore, are not to be construed as limitations on the invention.

[0034] Such as figure 1 ...

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Abstract

The invention discloses a super-structured material-based surface-enhanced infrared substrate and a molecule detection method thereof. The infrared substrate is sequentially provided with a support substrate, a uniform surface plasmon film, and a periodic array. By regulating the period of the periodic array, the uniform surface plasmon film of the infrared substrate and an electric dipole mode are coupled to each other, so that the resonance wavelength of the latter changes, and the near-field electric field strength increases. When a molecule to be measured is absorbed or prepared on the infrared substrate, a surface-enhanced infrared absorption spectrum of the molecule to be measured can be tested through external infrared spectroscopic equipment. The uniform surface plasmon film is made of a metal material or a dielectric material whose real part of the dielectric constant is negative, and the thickness is greater than 200nm. The detection method comprise the following steps of (1)acquisition of an experimental test spectrum; (2) acquisition of a theoretical simulation spectrum; (3) construction of an evaluation function; (4) inversion solution; and (5) result analysis.

Description

technical field [0001] The invention relates to the technical field of molecular detection, in particular to a metamaterial-based surface-enhanced infrared substrate and a molecular detection method thereof. Background technique [0002] Surface-enhanced spectroscopy utilizes near-field enhancement near rough surfaces or rationally designed metamaterial structures to enhance the scattered or reflected signals of attached molecules, thereby significantly improving the detection limit, even down to the single-molecule level. Since most molecules have their characteristic absorption fingerprints in the infrared wavelength range, infrared spectroscopy has become one of the most effective methods for identifying unknown organic species, which is called surface-enhanced infrared absorption spectroscopy (SEIRA). Therefore, SEIRA provides a powerful and reliable tool to detect trace molecules, as well as to study molecular conformational changes and molecular interactions. [0003]...

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Application Information

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IPC IPC(8): G01N21/35
CPCG01N21/35
Inventor 蔡国雄洪会青姚金叶龙芳柳清伙
Owner XIAMEN UNIV
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