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CN-122016646-A - Infrared liquid phase enhancement sensor based on plasmon BIC super surface

CN122016646ACN 122016646 ACN122016646 ACN 122016646ACN-122016646-A

Abstract

The invention relates to an infrared liquid phase enhanced sensor based on a plasmon BIC (building information center) super surface, which comprises a micro-fluidic sandwich layer and a super-surface sample layer, wherein a closed micro-fluidic cavity is arranged in the super-surface sample layer, a micro-nano structure is arranged on one side of the super-surface sample layer, which faces the micro-fluidic cavity, and consists of a plurality of repeating units distributed in a periodic array, each repeating unit is a pair of mirror symmetry elliptical discs, and the centers of the repeating units are reversely rotated in the same angle through the elliptical discs to break symmetry, so that a quasi BIC mode is excited. The invention brings strong light field local enhancement effect through symmetry break, strengthens interaction of light and liquid phase molecules, remarkably improves detection sensitivity, and can inhibit water background absorption interference by the micron-sized cavity, adapt to transmission and reflection dual measurement modes, and flexibly adjust structural parameters to adapt to detection of different target molecules.

Inventors

  • WANG JIE
  • WANG XIAO
  • CHEN MIN

Assignees

  • 中国科学院上海高等研究院

Dates

Publication Date
20260512
Application Date
20260204

Claims (10)

  1. 1. The infrared liquid phase enhancement sensor based on the plasmon BIC super surface is characterized by comprising a micro-fluidic sandwich layer for providing mechanical support and sealing pressure and a super-surface sample layer positioned in the micro-fluidic sandwich layer, wherein a sealed micro-fluidic cavity is arranged in the super-surface sample layer, the super-surface sample layer comprises a super-surface sample, a micro-nano structure is arranged on one side of the super-surface sample, facing the micro-fluidic cavity, of the super-surface sample, the micro-nano structure is composed of a plurality of repeating units distributed in a periodic array, each repeating unit is a pair of mirror symmetry elliptical discs, the elliptical discs rotate around the geometric center of each repeating unit to the same angle in opposite directions, the original rotational symmetry is broken, and the micro-nano structure is used for exciting a quasi-BIC mode and adapting to a transmission measurement mode and a reflection measurement mode.
  2. 2. The infrared liquid phase enhancement sensor of claim 1, wherein the elliptical disk has a rotation angle of 5 ° to 35 °, wherein the transmission measurement mode is adapted when the rotation angle is 20 ° and the reflection measurement mode is adapted when the rotation angle is 30 °.
  3. 3. The infrared liquid phase enhancement sensor according to claim 1, wherein the period of the repeating unit in the X-direction and the Y-direction is 3 μm to 3.5 μm.
  4. 4. The infrared liquid phase enhancement sensor of claim 3, wherein the pair of elliptical disks have a center-to-center spacing of 1.5 μm to 1.7 μm.
  5. 5. The infrared liquid phase enhancement sensor of claim 1, wherein said elliptical disk has a major axis dimension of 1.7 μm to 1.9 μm and a minor axis dimension of 0.3 μm to 0.4 μm.
  6. 6. The infrared liquid-phase enhanced sensor according to claim 1, wherein the micro-nano structure is deposited on a calcium fluoride substrate, the oval plate of the repeating unit is a gold oval plate with nano-scale thickness, an adhesion layer is arranged between the gold oval plate and the calcium fluoride substrate, and the adhesion layer is made of chromium or titanium.
  7. 7. The infrared liquid phase enhancement sensor according to claim 6, wherein the thickness of the gold elliptical disk is 30-100nm and the thickness of the adhesion layer is 3nm.
  8. 8. The infrared liquid-phase enhanced sensor according to claim 1, wherein the microfluidic clamping plate layer comprises an upper clamping plate layer and a lower clamping plate layer which are arranged up and down correspondingly, the super surface sample layer is positioned between the upper clamping plate layer and the lower clamping plate layer, and mechanical pressurization is realized by uniformly screwing screws at edges of the upper clamping plate layer and the lower clamping plate layer.
  9. 9. The infrared liquid-phase enhanced sensor of claim 1, wherein the super-surface sample layer further comprises an annular maillard film layer and a calcium fluoride window, the super-surface sample and the calcium fluoride window are arranged up and down correspondingly, the maillard film layer is arranged between the maillard film layer and the calcium fluoride window as a spacing layer, and the microfluidic cavity is jointly defined by the lower surface of the super-surface sample, the inner surface of the maillard film layer and the upper surface of the calcium fluoride window.
  10. 10. The infrared liquid phase enhancement sensor of claim 9, wherein the thickness of the microfluidic cavity is within 5 μιη.

Description

Infrared liquid phase enhancement sensor based on plasmon BIC super surface Technical Field The invention relates to a sensing technology, in particular to an infrared liquid phase enhanced sensor based on a plasmon BIC super surface. Background The infrared spectrum technology has the outstanding advantages of nondestructive detection and real-time response, and is widely applied to various fields such as biochemical analysis, environmental monitoring, water quality evaluation and the like. The functional activity of the biological molecules is highly dependent on the environment of the aqueous solution, so that the biological molecules have important significance for the infrared spectrum research of target molecules in a liquid phase system. However, in the actual molecular detection process of the liquid phase environment, the traditional infrared spectroscopy technology has two core limitations that the traditional infrared spectroscopy technology is difficult to surmount, namely, on one hand, the aqueous solution has extremely strong background absorption capacity to infrared light, forms strong background interference and seriously masks the characteristic spectrum signal of the target molecule, and on the other hand, the wavelength of the infrared light and the size of the molecule in the liquid phase system are obviously mismatched, so that the interaction between the infrared light and the target molecule is extremely weak, and further the detection sensitivity is lower. The problems seriously restrict the application effect of the traditional infrared spectrum technology in the actual scenes such as biological analysis, environmental monitoring and water body detection. In order to solve the above problems, the industry proposes to enhance the interaction between light and a substance by using the sub-wavelength structural characteristics of the plasmon super-surface through the electromagnetic field enhancement effect, and provides a potential solution for developing a high-performance infrared sensor. However, the existing infrared liquid phase detection technology based on the plasmon super surface still has obvious technical short plates, and the technology is specifically expressed as follows: Firstly, the existing plasmon super-surface device has the problem of large loss generally, so that the quality factor (Q value) of a resonance mode is low, and the detection sensitivity of trace target substances is difficult to further improve; Secondly, in the infrared spectrum measurement of conventional molecules, a transmission mode is a common mode for obtaining a high signal-to-noise ratio signal, but most of the existing sensor devices based on the super surface only support a reflection mode, so that the problem of weak signal easily occurs when a low-reflectivity solution is detected, the application requirements of conventional transmission measurement cannot be met, and the application scene and the measurement accuracy of the device are greatly limited; Thirdly, the structural design of the existing super-surface device lacks efficient and universal theoretical guidance and design rules, often depends on a time-consuming and labor-consuming parameter error testing method, and is insufficient in structural flexibility and difficult to adapt to different detection requirements and application scenes. Disclosure of Invention In order to solve the problems that the existing infrared liquid phase detection has obvious technical bottlenecks in detection sensitivity, measurement mode applicability, structural design efficiency and the like, the invention aims to provide an infrared liquid phase enhancement sensor based on a plasmon BIC super-surface. The infrared liquid phase enhanced sensor based on the plasmon BIC super surface comprises a micro-fluidic sandwich layer for providing mechanical support and sealing pressure and a super-surface sample layer positioned in the micro-fluidic sandwich layer, wherein a sealed micro-fluidic cavity is arranged in the super-surface sample layer, the super-surface sample layer comprises super-surface samples, a micro-nano structure is arranged on one side of the super-surface samples, facing the micro-fluidic cavity, of the super-surface samples, the micro-nano structure is composed of a plurality of repeating units distributed in a periodic array, each repeating unit is a pair of mirror symmetry oval discs, the geometric centers of the oval discs are rotated to the same angle in opposite directions around the geometric centers of the repeating units, the original rotational symmetry is broken, and the micro-nano structure is used for exciting a quasi BIC mode and adapting to a transmission measurement mode and a reflection measurement mode. In a preferred embodiment, the rotation angle of the elliptical disk is 5-35 °, wherein the transmission measurement mode is adapted when the rotation angle is 20 °, and the reflection measurement mode is adapted when