CN211014019U - Optical fiber liquid refractive index sensor modified by inverse opal photonic crystal structure - Google Patents
Optical fiber liquid refractive index sensor modified by inverse opal photonic crystal structure Download PDFInfo
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- CN211014019U CN211014019U CN201921853776.2U CN201921853776U CN211014019U CN 211014019 U CN211014019 U CN 211014019U CN 201921853776 U CN201921853776 U CN 201921853776U CN 211014019 U CN211014019 U CN 211014019U
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Abstract
The utility model discloses an optic fibre liquid refractive index sensor that anti-opal photonic crystal structure was decorated relates to refractive index sensor technical field, has solved traditional electronic sensor sensitivity still lower, response speed is slow, the volume is great, is difficult to the problem of working under complicated electromagnetic environment. The aluminum reflection layer is arranged on the two sides of the aluminum reflection layer, an aluminum oxide medium layer and an aluminum round hole array are sequentially arranged on the aluminum oxide support layer from bottom to top, and the aluminum reflection layer, the aluminum oxide support layer and the aluminum oxide medium layer enclose a channel for a refractive index solution to pass through. The effect of using all light to work without electric signals and working in a complex electromagnetic environment is achieved.
Description
Technical Field
The utility model relates to a refractive index sensor technical field, in particular to optic fibre liquid refractive index sensor that anti-opal photonic crystal structure was decorated.
Background
The micro-nano structure has unique optical characteristics and becomes a research hotspot of current photoelectric functional materials and devices, and the periodic micro-nano structure has important application prospects in the aspects of photon integration technology, stealth materials, super-resolution imaging, electromagnetic wave absorbers, radiation modulation, photoelectric detection, sensing measurement and the like. The surface plasmon excited by the microstructure can break through the diffraction limit of light and simultaneously cause the enhancement of a local electric field, the electric field component of the enhanced light is abnormally sensitive to the external environment, and the microstructure can be used for various sensing devices.
The refractive index is an important physical property of a substance, and physical quantities such as optical properties, dispersion, concentration and the like of the material can be obtained by measuring the refractive index of the material. In the field of biological detection, a sample is generally prepared into a solution, and various properties and parameters of the solution are obtained by detecting small changes of the refractive index of the solution, so that a refractive index sensor has an important practical role. However, the conventional electronic sensor has low sensitivity, slow response speed and large volume, and is difficult to work in a complex electromagnetic environment.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an optic fibre liquid refractive index sensor that anti-opal photonic crystal structure was decorated, it uses full gloss work, does not have the signal of telecommunication to participate in, can work under complicated electromagnetic environment.
The above technical purpose of the present invention can be achieved by the following technical solutions:
the utility model provides an optic fibre liquid refractive index sensor that anti-opal photonic crystal structure was decorated, includes the aluminium reflecting layer, the both sides of aluminium reflecting layer are equipped with the aluminium oxide supporting layer, follow supreme aluminium oxide dielectric layer and the aluminium round hole array of being equipped with in proper order down on the aluminium oxide supporting layer, and aluminium reflecting layer, aluminium oxide supporting layer and aluminium oxide dielectric layer enclose into the passageway that supplies refractive index solution to pass through.
Furthermore, the device also comprises a section of optical fiber, wherein a notch is formed in the optical fiber, and one side of the aluminum round hole array, which is close to the bottom of the notch, is placed in the notch; one end of the optical fiber is provided with incident linearly polarized light, and the other end of the optical fiber is provided with a spectrum analyzer for receiving the light.
Furthermore, the light source and the polaroid for changing the light of the light source into linearly polarized light are arranged at the incident end of the optical fiber.
Furthermore, another polaroid is arranged between the optical fiber and the spectrum analyzer.
Furthermore, the aluminum round hole array is a hexagonal close-packed periodic aluminum nanometer round hole array.
Further, the aluminum reflective layer was 300nm thick.
Further, the alumina dielectric layer is 50nm thick.
To sum up, the utility model discloses following beneficial effect has:
the light detection sensing technology based on the micro-nano structure becomes a research hotspot due to the advantages of high sensitivity, strong operability, no electromagnetic interference and high integration. The patent provides a photonic crystal structure modified optical fiber with an inverse Opal structure to form liquid refractive index sensing, and the liquid refractive index sensing can be realized in a visible light range. The all-optical working is used, no electric signal is involved, the all-optical working can work in a complex electromagnetic environment, and the drift of the working wavelength is realized through the change of the refractive index of the liquid flowing through.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural diagram of an aluminum circular hole array portion in the present invention;
FIG. 3 is a schematic view of the working principle of the present invention;
fig. 4 is a schematic view of the usage state of the present invention;
FIG. 5 is a graph of refractive index sensing performance.
In the figure, 1-1, an aluminum circular hole array; 1-2, an aluminum reflective layer; 2-1, an aluminum oxide dielectric layer; 2-2, an alumina support layer.
Detailed Description
The following description will be further described with reference to the accompanying drawings, which are not intended to limit the present invention.
An optical fiber liquid refractive index sensor modified by an inverse opal photonic crystal structure is shown in figure 1 and comprises an aluminum reflecting layer 1-2 with the thickness of 300nm, wherein an aluminum oxide supporting layer 2-2 with the height of 500nm is fixedly adhered to two sides of the aluminum reflecting layer 1-2 through Ti with the thickness of 1nm, an aluminum oxide medium layer 2-1 with the thickness of 50nm and an aluminum round hole array 1-1 with the thickness of 50nm sequentially adhere to the aluminum oxide supporting layer 2-2 from bottom to top through the Ti with the thickness of 1nm, and a channel for a refractive index solution to pass through is defined by the aluminum reflecting layer 1-2, the aluminum oxide supporting layer 2-2 and the aluminum oxide medium layer 2-1.
As shown in fig. 2, the aluminum round hole array 1-1 is a hexagonal close-packed periodic aluminum nano round hole array with a size of 300 μm by 100 μm, the round hole array is formed by electron beam etching, that is, the distance between any round hole and six adjacent round holes is the same, the distance between the centers of adjacent round holes is 400nm, and the radius of the round holes is 120 nm.
As shown in fig. 3, the optical fiber (not shown in the figure) is further included, a notch is formed in the optical fiber, one side of the aluminum circular hole array 1-1 is placed in the notch close to the groove bottom, the aluminum circular hole array can be adhered and fixed on the groove bottom through 1nm of Ti, or the aluminum circular hole array can be directly prepared at the groove bottom, and the aluminum oxide medium is positioned outside the optical fiber; one end of the optical fiber is provided with incident linearly polarized light, and the other end of the optical fiber is provided with a spectrum analyzer for receiving the light. Soaking a small section of optical fiber with a notch into a refractive index solution, enabling the refractive index solution to enter a channel formed by enclosing an aluminum reflecting layer 1-2, an aluminum oxide supporting layer 2-2 and an aluminum oxide medium layer 2-1, enabling linearly polarized light to be emitted from one end of the optical fiber and continuously emitted in the optical fiber, enabling the linearly polarized light to partially pass through an aluminum round hole array 1-1 and the aluminum oxide medium layer 2-1, enter the channel through which the refractive index solution passes, reflect under the action of the aluminum reflecting layer 1-2, reenter the optical fiber, emit from the other end after continuous reflection, and analyzing by a spectrum analyzer.
The optical fiber incidence end is provided with a light source and a polaroid for converting light of the light source into linearly polarized light, and in order to prevent interference of limited uncertainty factors in the optical fiber, another polaroid is arranged between the optical fiber and the spectrum analyzer.
Methods of making and using the device:
1. covering polystyrene on an aluminum reflecting layer 1-2 with the thickness of 300nm, and covering oxidation supporting layers on the aluminum reflecting layer 1-2 at the positions on two sides of the polystyrene;
2. covering an alumina dielectric layer 2-1 with the thickness of 50nm on a polystyrene and alumina support layer 2-2, and then preparing an inverse Opal structure photonic crystal structure, namely a hexagonal close-packed periodic aluminum nano circular hole array, by using a colloid ball imprinting technology;
3. etching the polystyrene by using acid to form a channel for the refractive index solution to flow through;
4. the whole is transferred to the side face of an optical fiber by using PMMA to form an optical fiber liquid refractive index sensor, and the method specifically comprises the steps of wrapping one side of an aluminum reflecting layer 1-2 of a sample by using PMMA, transferring to the optical fiber, and then etching off the PMMA; the refractive index solution flows through the middle of a channel enclosed by the aluminum reflecting layer 1-2, the aluminum oxide supporting layer 2-2 and the aluminum oxide medium layer 2-1;
5. soaking a small section of optical fiber with a notch into a refractive index solution, using a wide light source to match with a polaroid, enabling linearly polarized light to enter the optical fiber and be continuously emitted in the optical fiber, enabling part of the linearly polarized light to enter the device from one side of the aluminum round hole array 1-1, reflecting under the action of the aluminum reflecting layer 1-2 after passing through the refractive index solution, reentering the optical fiber, emitting from the other end after continuously reflecting, and finally carrying out sensing measurement on the refractive index by a spectrum analyzer after passing through another polaroid.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and those skilled in the art can make various modifications or equivalent substitutions within the spirit and scope of the present invention, and such modifications or equivalent substitutions should also be considered as falling within the scope of the present invention.
Claims (7)
1. The utility model provides an optic fibre liquid refractive index sensor that anti-opal photonic crystal structure modified which characterized in that: the aluminum reflection layer comprises aluminum reflection layers (1-2), aluminum oxide supporting layers (2-2) are arranged on two sides of the aluminum reflection layers (1-2), aluminum oxide medium layers (2-1) and aluminum round hole arrays (1-1) are sequentially arranged on the aluminum oxide supporting layers (2-2) from bottom to top, and channels for refractive index solutions to pass through are defined by the aluminum reflection layers (1-2), the aluminum oxide supporting layers (2-2) and the aluminum oxide medium layers (2-1).
2. The inverse opal photonic crystal structure modified fiber optic liquid refractive index sensor of claim 1, wherein: the optical fiber is provided with a notch, and one side of the aluminum round hole array (1-1) is placed in the notch close to the bottom of the notch; one end of the optical fiber is provided with incident linearly polarized light, and the other end of the optical fiber is provided with a spectrum analyzer for receiving the light.
3. The inverse opal photonic crystal structure modified fiber optic liquid refractive index sensor of claim 2, wherein: the optical fiber incidence end is provided with a light source and a polaroid for changing the light of the light source into linearly polarized light.
4. The inverse opal photonic crystal structure modified fiber optic liquid refractive index sensor of claim 3, wherein: and another polaroid is arranged between the optical fiber and the spectrum analyzer.
5. The inverse opal photonic crystal structure modified fiber optic liquid refractive index sensor of claim 1, wherein: the aluminum round hole array (1-1) is a hexagonal close-packed periodic aluminum nanometer round hole array.
6. The inverse opal photonic crystal structure modified fiber optic liquid refractive index sensor of claim 1, wherein: the aluminum reflective layer (1-2) was 300nm thick.
7. The inverse opal photonic crystal structure modified fiber optic liquid refractive index sensor of claim 1 or 6, wherein: the alumina dielectric layer (2-1) is 50nm thick.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114113049A (en) * | 2021-11-30 | 2022-03-01 | 南京信息工程大学 | Preparation method and application of self-luminous photonic crystal electrochemiluminescence sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114113049A (en) * | 2021-11-30 | 2022-03-01 | 南京信息工程大学 | Preparation method and application of self-luminous photonic crystal electrochemiluminescence sensor |
| CN114113049B (en) * | 2021-11-30 | 2023-05-30 | 南京信息工程大学 | Preparation method and application of self-luminous photonic crystal electrochemiluminescence sensor |
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