CN213903316U - Glucose solution measuring device of surface plasmon open square ring resonant cavity - Google Patents
Glucose solution measuring device of surface plasmon open square ring resonant cavity Download PDFInfo
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- CN213903316U CN213903316U CN202022999416.2U CN202022999416U CN213903316U CN 213903316 U CN213903316 U CN 213903316U CN 202022999416 U CN202022999416 U CN 202022999416U CN 213903316 U CN213903316 U CN 213903316U
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Abstract
The utility model discloses a glucose solution measuring device of a surface plasmon open square ring resonant cavity, which is characterized by comprising a silicon dioxide substrate layer and a silver nano layer which are sequentially spliced from bottom to top, wherein the middle part of the silver nano layer is provided with a T-shaped waveguide which is composed of two straight waveguides which are vertical to each other and are communicated with each other, the inner edge of one straight waveguide of the T-shaped waveguide is provided with a square convex branch which faces inwards, the side of the convex branch is provided with a cavity which is not closed and square, namely, the cavity is provided with an opening, the opening is right opposite to the convex branch, the cavity is not communicated with the T-shaped waveguide, the convex branch is communicated with the T-shaped waveguide, the cavity, the T-shaped waveguide and the convex branch are filled with liquid to be measured, namely glucose solution with different concentrations, the measuring device can determine the sub-wavelength constraint and simultaneously improve the defect that the biosensing sensitivity of the current SPPs waveguide device is lower, and the structure is simple and the preparation is easy.
Description
Technical Field
The utility model relates to a receive the sensing field a little, specifically be a glucose solution measuring device of opening square ring resonant cavity of surface plasmon.
Background
The surface plasmon is an electromagnetic evanescent wave generated by mutual coupling excitation of free electrons on the metal and the dielectric medium interface through light and the metal surface, can break through the diffraction limit of the light, and has wide application prospect in the sensing field of the surface plasmon under the sub-wavelength size. In 2003, the Chao Chung Yen group proposed a biosensor based on a sharp asymmetric resonance polymer micro-ring, and used for detecting glucose concentration, and a polystyrene micro-ring resonator was prepared by nanoimprint technology, and spectra were measured in glucose solutions of different concentrations, and it was found that the change of resonance wavelength and the change of normalized transmission intensity are in a linear relationship with the concentration of the glucose solution.
Optics Communications published on 2017, volume 465, page 125614
The A nano sensor with ultra-high FOM base on tunable planar resonator, Wang Shuo group, proposes a plasma structure in which a metal baffle plate in the middle of a metal-insulator-metal (MIM) waveguide is coupled with an isosceles triangular cavity, so as to realize triple Fano resonance, and the sensitivity of the sensor is as high as 120 nm/RIU. A series of liquid sensors are proposed in succession in recent decades, but the development and application of biosensors are still limited by technical bottlenecks such as high manufacturing cost, poor usability and low sensitivity.
At present, most of sensors applied to liquid measurement, especially biosensors for measuring the concentration of a glucose solution, mainly focus on the research on evanescent coupling and sensitivity improvement, and have less research on a high-sensitivity multiple Fano resonance biosensor technology.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a glucose solution measuring device of opening square ring resonant cavity of surface plasmon to the not enough of prior art. The measuring device can determine the sub-wavelength constraint and simultaneously improve the defect of low biosensing sensitivity of the current SPPs waveguide device, and has the advantages of simple structure and easy preparation.
Realize the technical scheme of the utility model is that:
a glucose solution measuring device of a surface plasmon opening square ring resonant cavity comprises a silicon dioxide substrate layer and a silver nano layer which are sequentially connected from bottom to top in a splicing mode, wherein a T-shaped waveguide which is formed by two straight waveguides which are perpendicular to each other and communicated with each other is arranged in the middle of the silver nano layer, an inward-facing square protruding branch is arranged on the inner side of one straight waveguide of the T-shaped waveguide, a non-closed square cavity body which is a cavity body with an opening is arranged beside the protruding branch, the opening is right opposite to the protruding branch, the cavity body is not communicated with the T-shaped waveguide, the protruding branch is communicated with the T-shaped waveguide, liquid to be measured, namely glucose solution with different concentrations, is filled in the cavity body, the T-shaped waveguide and the protruding branch, and the glucose solution has good sensing characteristics and is a good solution measurement sensing material.
The height of the T-shaped waveguide is consistent with the thickness of the silver nano layer.
The height of the cavity is consistent with the thickness of the silver nano layer.
The silver nano layer and the glucose solution sandwiched between the silver nano layers form a metal-insulator-metal surface plasmon Fano resonance structure.
The measuring device increases the coupling strength of the T-shaped waveguide tube and the open square ring resonant cavity, so that sharp and asymmetric Fano resonance lines appear in the transmission spectrum, the Fano resonance lines are sensitive to structural parameters and the surrounding environment, and the sensing super-resolution is realized.
The silica substrate layer in the measuring device is manufactured through a sol-gel process, so that the silica substrate layer can be ensured to have good buffering characteristics, and the generated SPPs are ensured to have smaller loss.
The silver nano layer in the measuring device is formed by depositing a silver film on a silicon dioxide substrate layer, and etching a T-shaped waveguide with branches and an open square ring-shaped resonant cavity by adopting focused ion beams.
Incident light enters the glucose solution from one side of the T-shaped waveguide through optical fiber coupling, emergent light is output from the other side of the T-shaped waveguide, and the power of the output light before and after the concentration of the glucose solution changes is calculated through an optical power meter, so that the change of the concentration of glucose can be detected.
Compared with other metals, the metal Ag has lower energy loss, the glucose solution has smaller influence on the optical property of the metal Ag, the glucose solution is used as a sensing material, the variation of the concentration of the glucose solution can be converted into the variation of the refractive index, and further the coupling strength of the structure is influenced.
The generation of Fano resonance lines by coupled excitation of light in the above described measuring device is twofold.
The measuring device utilizes the influence of different glucose concentrations on the coupling strength to further influence the change of the output light power, so that the liquid measurement is finally realized.
The measuring device can determine the sub-wavelength constraint and simultaneously improve the defect of low biosensing sensitivity of the current SPPs waveguide device, and has the advantages of simple structure and easy preparation.
Drawings
Fig. 1 is a schematic structural diagram of the embodiment.
In the figure, 1, a silicon dioxide substrate layer 2, a metal silver nano layer 3, a T-shaped waveguide 4, a convex branch 5, a cavity 6, an opening 7, incident light 8 and emergent light are arranged.
Detailed Description
The contents of the present invention will be further explained with reference to the drawings and examples, but the present invention is not limited thereto.
Example (b):
referring to fig. 1, a glucose solution measuring device of a surface plasmon open square ring resonator comprises a silicon dioxide substrate layer 1 and a silver nano layer 2 which are sequentially overlapped from bottom to top, the middle part of silver nanolayer 2 is equipped with the T type waveguide 3 that is the T shape that has mutually perpendicular and communicating two straight waveguides to constitute, be equipped with the protruding branch and knot 4 that is square that is inwards towards on the interior limit of a straight waveguide of T type waveguide 3, the next door of protruding branch and knot 4 is equipped with the cavity 5 that is unclosed square shape and takes opening 6, opening 6 just is protruding branch and knot 4, cavity 5 and T type waveguide 3 do not communicate with each other, protruding branch and knot 4 communicates with each other with T type waveguide 3, cavity 5 and T type waveguide 3 and protruding branch and knot 4 are filled with the liquid that awaits measuring namely the glucose solution of different concentrations, glucose solution has better sensing characteristic, is better solution measurement response material.
The height of the T-shaped waveguide 3 is consistent with the thickness of the silver nanolayer 2.
The height of the cavity 5 is consistent with the thickness of the silver nano layer 2.
In this example, the glucose solution sandwiched between the silver nano-layer 2 and the silver nano-layer 2 constitutes a metal-insulator-metal surface plasmon Fano resonance structure.
The silica substrate layer 1 in the measuring device of the embodiment is manufactured by a sol-gel process, so that the silica substrate layer 1 can be ensured to have good buffering characteristics, and the generated SPPs can be ensured to have smaller loss.
In the measurement device, a silver nano layer 2 is formed by depositing a silver film on a silicon dioxide substrate layer 1, and etching a T-shaped waveguide 3 with branches and a cavity 5 of a resonant cavity in the shape of an open square ring by using focused ion beams.
The incident light 7 enters the glucose solution from one side of the T-shaped waveguide 3 through optical fiber coupling, the emergent light 8 is output from the other side of the T-shaped waveguide 3, the power of the output light before and after the concentration change of the glucose solution is calculated through an optical power meter, and the detection of the concentration change of the glucose can be realized.
The metal Ag has lower energy loss than other metals, the glucose solution has small influence on the optical property of the metal Ag, the glucose solution is used as a sensing material and can convert the variation of the concentration of the glucose solution into the variation of the refractive index to further influence the coupling strength of the structure, in the measuring device, the coupling strength of the T-shaped waveguide 3 and the cavity 5 resonant cavity is increased, so that a sharp and asymmetric Fano resonance line appears in a transmission spectrum, the Fano resonance line is extremely sensitive to structural parameters and the surrounding environment, and meanwhile, the extinction spectrum of the Fano resonance line can increase the resolution of sensing.
Claims (3)
1. The utility model provides a glucose solution measuring device of opening square ring resonant cavity of surface plasmon, its characterized in that includes silica substrate layer and the silver nanometer layer of splice in proper order from bottom to top, the middle part of silver nanometer layer is equipped with mutually perpendicular and the T type waveguide that is the T shape that two communicating straight waveguides constitute, is equipped with the protruding minor matters that is square that is of inside orientation on the interior limit of a straight waveguide of T type waveguide, and the next door of protruding minor matters is equipped with the cavity that is unclosed square shape and takes the opening, and the opening is just to protruding minor matters, and the cavity does not communicate with each other with T type waveguide, and protruding minor matters communicates with each other with T type waveguide, and the cavity is filled with the glucose solution that has the liquid that awaits measuring promptly different concentrations in T type waveguide and the protruding minor matters.
2. The surface plasmon open square ring resonator glucose solution measurement device of claim 1, wherein the height of said T-shaped waveguide corresponds to the thickness of the silver nanolayer.
3. The surface plasmon open square ring resonator glucose solution measurement device of claim 1, wherein the cavity height corresponds to the thickness of the silver nanolayer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022999416.2U CN213903316U (en) | 2020-12-15 | 2020-12-15 | Glucose solution measuring device of surface plasmon open square ring resonant cavity |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022999416.2U CN213903316U (en) | 2020-12-15 | 2020-12-15 | Glucose solution measuring device of surface plasmon open square ring resonant cavity |
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| CN213903316U true CN213903316U (en) | 2021-08-06 |
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| CN202022999416.2U Expired - Fee Related CN213903316U (en) | 2020-12-15 | 2020-12-15 | Glucose solution measuring device of surface plasmon open square ring resonant cavity |
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Granted publication date: 20210806 Termination date: 20211215 |