CN217059928U - One-dimensional photonic crystal layered structure and detection device based on same - Google Patents
One-dimensional photonic crystal layered structure and detection device based on same Download PDFInfo
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- CN217059928U CN217059928U CN202220425664.2U CN202220425664U CN217059928U CN 217059928 U CN217059928 U CN 217059928U CN 202220425664 U CN202220425664 U CN 202220425664U CN 217059928 U CN217059928 U CN 217059928U
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Abstract
The invention discloses a one-dimensional photonic crystal layered structure and a detection device based on the same, wherein the one-dimensional photonic crystal layered structure comprises a first dielectric material layer, a second dielectric material layer and a sodium chloride solution defect layer, the sodium chloride solution defect layer is an accommodating space formed by the first dielectric material layer and the second dielectric material layer in a surrounding mode, the first dielectric material layer and the second dielectric material layer are arranged on two sides of the sodium chloride solution defect layer respectively, the first dielectric material layer and the second dielectric material layer are alternately arranged on two sides of the sodium chloride solution defect layer and extend towards the directions of the two sides of the sodium chloride solution defect layer, and 6 alternate layers are arranged on one side of the sodium chloride solution defect layer. The structure is matched with a vector network analyzer, can be used for detecting the concentration of a sodium chloride solution, has higher sensitivity to the peak position of a defect peak, and has lower influence of environmental factors on the sensitivity of the peak position of the defect peak.
Description
Technical Field
The utility model relates to a sodium chloride solution concentration measurement field specifically relates to a one-dimensional photonic crystal layer-shaped structure and detection device based on this structure.
Background
The sodium chloride solution of different concentrations can simulate the sea water environment and carry out various experiments, and the product that the ocean problem can be alleviated in the green environmental protection of convenient research, the survey of the sodium chloride concentration in the sea water has important effect to the detection and the protection of marine environment. The solubility of the sodium chloride solution has a certain relation with the temperature, and the determination of the sodium chloride concentration has a certain meaning for monitoring the climate change.
The chemical analysis method mainly depends on the metering relation of chemical reaction and substances to determine the concentration of the liquid to be detected, and has more complex flow and more workload. The physical methods include an optical sensing method, a microwave sensing method, an ultrasonic measuring method, and the like. The optical sensing method is greatly influenced by factors such as sample characteristics, measuring environment, experimental conditions and the like, the microwave sensing method is greatly influenced by environment temperature and temperature of a measured substance, the trial frequency range of the ultrasonic measuring method is small, and the low-concentration condition is difficult to distinguish.
Disclosure of Invention
In order to solve the above-mentioned measurement flow complicacy, environmental impact factor is big, the coarse problem of measuring result, the utility model provides a one-dimensional photonic crystal lamellar structure and detection device based on this structure.
In order to achieve the above object, the present invention provides a one-dimensional photonic crystal layered structure, wherein: the one-dimensional photonic crystal layered structure comprises a first dielectric material layer, a second dielectric material layer and a sodium chloride solution defect layer, wherein the sodium chloride solution defect layer is an accommodating space formed by the first dielectric material layer and the second dielectric material layer in a surrounding mode, the first dielectric material layer and the second dielectric material layer are arranged on the two sides of the sodium chloride solution defect layer respectively, the first dielectric material layer and the second dielectric material layer are alternately arranged on the two sides of the sodium chloride solution defect layer and extend towards the directions of the two sides of the sodium chloride solution defect layer, and 6 layers are alternately arranged on one side;
the first dielectric material layer and the second dielectric material layer are both physically thick and have refractive indexes which meet the condition that the optical path is a quarter of the central wavelength, the first dielectric material layer is silicon dioxide, and the second dielectric material layer is titanium dioxide.
Preferably, the thickness of the sodium chloride solution defect layer is 365 nm.
Preferably, the refractive index of the first dielectric material layer is 1.53, the refractive index of the second dielectric material layer is 2.49, and the central wavelength is 1000 nm.
As another aspect of the present invention, the present invention provides a detection apparatus for a one-dimensional photonic crystal layered structure, comprising: the system comprises a one-dimensional photonic crystal layered structure and a vector network analyzer provided with a signal transmitting end and a signal receiving end, wherein the one-dimensional photonic crystal layered structure is arranged between the signal transmitting end and the signal receiving end, and a signal transmitted by the signal transmitting end penetrates through the one-dimensional photonic crystal layered structure and then is received by the signal receiving end.
Preferably, the vector network analyzer is in signal connection with a computer.
Preferably, the one-dimensional photonic crystal layered structure is disposed in the middle of the signal transmitting end and the signal receiving end.
The invention has the following beneficial effects:
the utility model discloses well sodium chloride solution concentration has great sensitivity to defect peak position, and environmental factor is lower to defect peak position sensitivity. Meanwhile, the one-dimensional photonic crystal has wide application range and is wear-resistant. The device can be used for multiple times in different environments, and complex preparation and operation processes are avoided. In addition, the silicon dioxide and the titanium dioxide are used as film preparation materials, the materials are easy to obtain, and related preparation methods are mature.
Drawings
FIG. 1 is a view of a structure of a one-dimensional photonic crystal;
FIG. 2 is a schematic view of a sodium chloride solution concentration detection device;
FIG. 3 is a graph of transmittance characteristics of temperature versus defect peak position for the same NaCl solution concentration;
FIG. 4 is a graph of one-dimensional photonic crystal transmittance characteristics corresponding to different concentrations of sodium chloride solution;
reference numerals:
1-a one-dimensional photonic crystal layered structure; 11-a first layer of dielectric material; 12-a second layer of dielectric material; 13-a sodium chloride solution defect layer; 2-a vector network analyzer; 21-a signal transmitting end; 22-signal receiving end.
Detailed Description
The present invention is further described below.
Example 1
The embodiment provides a one-dimensional photonic crystal layered structure 1, which includes a first dielectric material layer 11, a second dielectric material layer 12 and a sodium chloride solution defect layer 13, wherein the first dielectric material layer 11 and the second dielectric material layer 12 are respectively disposed on two sides of the sodium chloride solution defect layer 13, the first dielectric material layer 11 and the second dielectric material layer 12 are sequentially and alternately disposed and extend in the directions of two sides of the sodium chloride solution defect layer 13, and 6 alternate layers are respectively disposed on one side; the physical thickness and refractive index of the first dielectric material layer 11 and the second dielectric material layer 12 are such that the optical path is a quarter of the central wavelength, which is the wavelength of the incident light of the one-dimensional photonic crystal, i.e. the wavelength of the light emitted from the signal emitting end. The first dielectric material layer 11 is silicon dioxide, and the second dielectric material layer 12 is titanium dioxide. The thickness of the sodium chloride solution defect layer 13 surrounded by the first dielectric material layer 11 and the second dielectric material layer 12 is 365nm, and the sodium chloride solution is used for injecting. The refractive index of the first dielectric material layer 11 was 1.53, the refractive index of the second dielectric material layer 12 was 2.49, and the center wavelength was 1000 nm. Further, the preparation method of the one-dimensional photonic crystal comprises the steps of firstly growing a first dielectric material layer 11 and a second dielectric material layer 12 with designed thicknesses on an optical substrate in sequence by a film coating or magnetron sputtering method, growing 6 periods according to the same method, and then alternately growing the second dielectric material layer 12 and the first dielectric material layer 11 with 6 periods, thereby completing the preparation of the one-dimensional photonic crystal.
The structure of the one-dimensional photonic crystal 4 for detection is (AB) n C(BA) n Wherein A represents a first dielectric material layer 11, B represents a second dielectric material layer 12, C represents a sodium chloride solution defect layer 13, n represents the arrangement period number of two dielectric layers before and after the defect layer C, n =6, the physical thickness of the first dielectric material layer 11 is determined according to the refractive index of silicon dioxide and any central wavelength, and the physical thickness of the second dielectric material layer 12 is determined according to the center wavelengthThe physical thickness of the defect layer is 365nm, determined by the refractive index of titanium dioxide and any center wavelength, and the physical thickness of the first dielectric material layer 11 and the second dielectric material layer 12 and the refractive index thereof satisfy the optical path length of a quarter of the center wavelength.
As shown in FIG. 1, the dielectric materials of silicon dioxide and titanium dioxide are selected in the present example, and the defect layer is sodium chloride solution according to (AB) n C(BA) n The structure of the optical film is that 6 periodic structures are respectively taken on two sides of a defect layer, a vacuum film coating machine with the model number of WD.54-450 is adopted, a quartz plate is selected as an optical substrate, 6 layers are alternately formed on the optical substrate by a film coating method, and the two-time separated generation is repeated. Firstly, the 1 st, 3 rd and 5 th layers are silicon dioxide layers, the 2 nd, 4 th and 6 th layers are titanium dioxide layers, the first silicon dioxide layer with the thickness of 163.4nm is plated on the optical substrate, then the titanium dioxide layer with the thickness of 100.4nm is plated on the first layer, one period of the photonic crystal is obtained, and then the photonic crystal is grown for 5 periods by the same method. This operation was repeated twice. Obtaining 12 periods in total before and after the defect layer, overlapping the two generated photonic crystal materials in front and back, reserving a gap with the thickness of 365nm in the middle as the defect layer, sealing the periphery of the defect layer by using an acrylic plate, reserving an injection hole on the defect layer, and conveniently adding a sodium chloride solution to be detected in the later period to prepare the one-dimensional photonic crystal shown in figure 1.
Example 2
The embodiment provides a sodium chloride solution concentration detection device based on a one-dimensional photonic crystal layered structure, which comprises a one-dimensional photonic crystal layered structure 1 and a vector network analyzer 2 provided with a signal transmitting end 21 and a signal receiving end 22, wherein the one-dimensional photonic crystal layered structure 1 is arranged between the signal transmitting end 21 and the signal receiving end 22, and a signal transmitted by the signal transmitting end 21 passes through the one-dimensional photonic crystal layered structure 1 and then is received by the signal receiving end 22. The vector network analyzer 2 is in signal connection with a computer and used for analyzing data. Preferably, the one-dimensional photonic crystal layered structure 1 is arranged in the middle of the signal emitting end 21 and the signal receiving end 22, so as to ensure the detection effect.
When in use, the one-dimensional photonic crystal is fixed on a vector network analyzerAnd injecting a sodium chloride solution to be detected into the defect layer, emitting a beam of light with the wavelength of 1000nm to the one-dimensional photonic crystal from left to right, receiving the transmitted light wave, fitting a transmissivity characteristic diagram by a vector network analyzer, and inverting according to the peak position of a defect peak in the characteristic diagram to obtain the concentration of the sodium chloride solution. Vector network analyzer selection R&S ® ZC1100, this model provides excellent radio frequency performance, rich software functionality and a unique hardware concept. The thickness of the defect layer of the one-dimensional photonic crystal is 365nm, and the central wavelength of a radio-frequency signal emitted by the vector analyzer is 1000 nm.
The embodiment provides a sodium chloride solution concentration detection device based on one-dimensional photonic crystal, and the device detection device working wave band is near-infrared wave band, and the relation of sodium chloride solution concentration and defect peak position is:
wherein S is the concentration of the sodium chloride solution, and lambda is the wavelength of the defect mode peak position.
As shown in fig. 2, the one-dimensional photonic crystal is fixed in the middle of a vector network analyzer, and the vector network analyzer analyzes the transmission spectrum through a transmitting antenna and a receiving antenna, and transmits the result to a computer for display.
As shown in FIG. 3, on the premise that the concentration of the sodium chloride solution is 20%, environmental influence factors at the temperature from 10 ℃ to 50 ℃ are taken into consideration to obtain a transmissivity characteristic diagram shown in FIG. 3, the change of the temperature influences the refractive index of the sodium chloride solution, the refractive index integrally shows a weakening trend along with the increase of the temperature, meanwhile, the defect peak frequency obtained through simulation has small shift, and the sensitivity of the temperature of the sodium chloride solution is 0.0415 nm/RIU. Therefore, the influence of the temperature change on the peak position of the defect peak during the concentration measurement of the sodium chloride solution is very weak. In an actual measurement environment, the influence of the real-time variation of the temperature on the concentration of the sodium chloride solution measured by the one-dimensional photonic crystal can be ignored, and the result obtained by the measuring method is good in stability.
As shown in FIG. 4, the room temperature was controlled at 20 ℃ and the concentration of sodium chloride solution at 4%,8%,12%,16%,20%,24%,28%,32% was simulated,and obtaining corresponding transmissivity characteristic diagrams under different concentrations. As can be seen from FIG. 4, as the concentration of the solution increases, the wavelength at the peak of the defect mode gradually shifts from 992.32nm at a solution concentration of 4% to a long wavelength, and the shift width is proportional to the change in the solution concentration. The refractive index sensitivity of the obtained sodium chloride solution is 57 nm/RIU. The solution refractive index sensitivity is higher at this time, which shows that the change of the sodium chloride solution concentration can be captured by the one-dimensional defect type photonic crystal model. The two sensitivity calculations show that the change of the refractive index of the solution is mainly caused by the concentration of the solution, the weight is about 92% -93%, the influence of the temperature of the solution on the change of the refractive index is small, and the weight is only 7% -8%. And (3) arranging the obtained sodium chloride solution and the defect mode position data at different concentrations, and analyzing the fitting data to obtain a fitting equation:
wherein S is the concentration of the sodium chloride solution, and lambda is the wavelength of the defect mode peak position.
The concentration of the sodium chloride solution can be obtained by inverting the defect peak position wavelength obtained in the vector network analyzer by taking the defect peak position wavelength into the fitting equation.
The utility model discloses a sodium chloride solution concentration detection device based on one-dimensional photonic crystal, the device add sodium chloride solution in the one-dimensional photonic crystal of the finite period that forms according to certain cycle alternate arrangement by two kinds of different dielectric materials and constitute as the defect layer, its structural component becomes (AB) n C(BA) n A represents silicon dioxide (SiO 2), B represents titanium dioxide (TiO 2), C represents a sodium chloride solution, and n represents the number of arrangement cycles of the two media before and after the defect layer C. The sodium chloride solutions with different concentrations form different defect peak positions in the defect layer, and accordingly the concentration of the sodium chloride solution can be obtained through inversion of the defect peak position relation. The utility model discloses measure sodium chloride solution concentration sensitivity height, accuracy, easy operation.
It should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (6)
1. A one-dimensional photonic crystal layered structure, comprising: the one-dimensional photonic crystal layered structure (1) comprises a first dielectric material layer (11), a second dielectric material layer (12) and a sodium chloride solution defect layer (13), wherein the sodium chloride solution defect layer (13) is an accommodating space formed by the first dielectric material layer (11) and the second dielectric material layer (12) in a surrounding mode, the first dielectric material layer (11) and the second dielectric material layer (12) are arranged on two sides of the sodium chloride solution defect layer (13) respectively, the first dielectric material layer (11) and the second dielectric material layer (12) are alternately arranged on two sides of the sodium chloride solution defect layer (13) and extend in the directions of the two sides of the sodium chloride solution defect layer (13), and 6 alternate layers are arranged on one side;
the physical thickness and the refractive index of the first dielectric material layer (11) and the second dielectric material layer (12) both meet the condition that the optical path is a quarter of the central wavelength, the first dielectric material layer (11) is silicon dioxide, and the second dielectric material layer (12) is titanium dioxide.
2. The one-dimensional photonic crystal layered structure of claim 1, wherein: the thickness of the sodium chloride solution defect layer (13) is 365 nm.
3. The one-dimensional photonic crystal layered structure of claim 1, wherein: the refractive index of the first dielectric material layer (11) is 1.53, the refractive index of the second dielectric material layer (12) is 2.49, and the central wavelength is 1000 nm.
4. A sodium chloride solution concentration detection apparatus based on the one-dimensional photonic crystal layered structure of any one of claims 1 to 3, characterized in that: the device comprises a one-dimensional photonic crystal layered structure (1) and a vector network analyzer (2) provided with a signal transmitting end (21) and a signal receiving end (22), wherein the one-dimensional photonic crystal layered structure (1) is arranged between the signal transmitting end (21) and the signal receiving end (22), and a signal transmitted by the signal transmitting end (21) penetrates through the one-dimensional photonic crystal layered structure (1) and then is received by the signal receiving end (22).
5. The apparatus for detecting the concentration of sodium chloride solution based on one-dimensional photonic crystal layer structure as claimed in claim 4, wherein: the vector network analyzer (2) is in signal connection with a computer.
6. The apparatus for detecting the concentration of a sodium chloride solution in a one-dimensional photonic crystal layered structure according to claim 4, wherein: the one-dimensional photonic crystal layered structure (1) is arranged in the middle of the signal transmitting end (21) and the signal receiving end (22).
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