A photonic crystal solution concentration detection device

Abstract

The utility model discloses a photonic crystal solution concentration detection device, including tunable semiconductor laser, tunable semiconductor laser's side is sequentially provided with collimating mirror, polarizer, light modulator, beam expander, photonic crystal sensor, focusing mirror, spectrometer and computer. The photonic crystal of two single negative refractive index material periodic arrangement of the utility model has zero effective phase band gap, and the local field is enhanced through surface plasmon resonance, realizes high sensitivity and anti -interference nature, and the response time of zero effective phase band gap photonic crystal to refractive index change is nanosecond level, and need not complex optical system, and only need fixed wavelength detection can realize concentration solution, and single negative material photonic crystal can be realized through superstructured material design, and only needs several simple functional layers to form effective band gap, and through electromagnetic field localization enhancement and process compatibility, realizes the breakthrough of low -cost, easy integration performance.

Description

Technical Field

[0001] This utility model relates to the field of concentration detection technology, specifically a photonic crystal solution concentration detection device. Background Technology

[0002] Alcohol is an indispensable raw material in daily life and industrial production, and its concentration measurement is crucial for reflecting the various properties of alcohol solutions. Different concentrations of alcohol solutions possess different physical and chemical properties, making accurate concentration detection during production and use particularly important. Currently, traditional methods for measuring alcohol concentration mainly include physical and chemical methods. For example, the density bottle method and alcohol meter method rely on the physical properties of the liquid for measurement, while the potassium dichromate colorimetric method, Mohr's salt method, and iodometric titration method are based on chemical reactions. In addition, interferometry methods in physical optics (such as Michelson interferometers and Fabry-Perot interferometers) and channel self-mixing interferometer methods are also commonly used for determining the mass fraction of transparent solutions. However, these traditional methods each have certain drawbacks and limitations: the density bottle method requires precise control of temperature and environmental conditions, is cumbersome to operate, and is significantly affected by liquid impurities. The alcohol meter method has a limited scope of application, typically only applicable to alcohol solutions within a specific concentration range, and requires regular calibration. The potassium dichromate colorimetric method requires the use of harmful chemical reagents, posing safety risks. Furthermore, the reaction time is long, affecting detection efficiency. The Mohr's salt method requires sophisticated sample pretreatment, involves complex procedures, and is sensitive to interfering substances in the solution. Iodometric titration demands precise control of the titration process and requires accurate determination of the reaction endpoint. Michelson and Fabry-Perot interferometers are typically complex and expensive, require highly skilled operators, and are susceptible to ambient light interference. Channel self-mixing interferometers, compared to other optical methods, may lack sufficient sensitivity and stability, and require sophisticated equipment calibration.

[0003] In recent years, with the development of photonic crystals in the field of micro-nano optics, some sensors that utilize the band gap and spectral lines of photonic crystals for quantitative analysis of solution concentration have emerged. These methods typically treat the solution as a defect layer of the photonic crystal, using the transfer matrix method to calculate the transmission characteristics of the designed one-dimensional defect photonic crystal, and establishing the relationship between the defect transmission coefficient and the concentration to be measured. However, one-dimensional photonic crystals composed of periodically arranged traditional materials only form Bragg band gaps, which makes their transmission spectra particularly sensitive to the material's geometry and incident angle. This not only increases the complexity of the measurement but also results in very poor sensor stability. Utility Model Content

[0004] Therefore, the purpose of this invention is to provide a photonic crystal solution concentration detection device. The photonic crystal formed by periodically arranging positive and negative refractive index materials has a zero average refractive index bandgap; while the photonic crystal formed by periodically arranging two single negative refractive index materials has a zero effective phase bandgap. The photonic crystal composed of two single negative refractive index materials exhibits significant advantages in alcohol concentration sensing: its zero effective phase bandgap is extremely sensitive to changes in the dielectric environment, and by enhancing the local field through surface plasmon resonance, it achieves high sensitivity (up to 2–3 times that of traditional structures) and anti-interference capabilities; simultaneously, the response time of the photonic crystal with zero effective phase bandgap to refractive index changes is in the nanosecond range, and it does not require a complex optical system, only a fixed wavelength detection is needed to achieve concentration calculation. In terms of fabrication, traditional photonic crystals require multiple layers of high-precision alternating deposition (such as SiO2 / TiO2), while single negative material photonic crystals can be achieved through metamaterial design (such as metal-dielectric composite structures), requiring only a few simple functional layers to form an effective bandgap; at the same time, through electromagnetic field localization enhancement and process compatibility, it achieves a low-cost, easily integrated performance breakthrough. These characteristics collectively drive its potential application in low-cost, high-precision, and easily integrated alcohol sensors.

[0005] To solve the above-mentioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution: a photonic crystal solution concentration detection device, comprising a tunable semiconductor laser, wherein a collimating lens, a polarizer, a light modulator, a beam expander, a photonic crystal sensor, a focusing lens, a spectrometer, and a computer are sequentially arranged on the side of the tunable semiconductor laser;

[0006] The tunable semiconductor laser is processed sequentially through a collimating lens, a polarizer, an optical modulator, a beam expander, a photonic crystal sensor, a focusing lens, and a spectrometer, and the final signal is processed by a computer.

[0007] As a preferred embodiment of the photonic crystal solution concentration detection device of this utility model, it further includes a first magnetic single negative material, a first electrical single negative material, an alcohol solution, a second magnetic single negative material, and a second electrical single negative material.

[0008] As a preferred embodiment of the photonic crystal solution concentration detection device of this utility model, the photonic crystal sensor is specifically composed of a first magnetic single negative material, a first electrical single negative material, an alcohol solution, a second magnetic single negative material, and a second electrical single negative material.

[0009] In a preferred embodiment of the photonic crystal solution concentration detection device described in this utility model, the internal connection relationship of the photonic crystal sensor is as follows:

[0010] The first magnetic single negative material to the first electric single negative material are configured with L = 10 layers;

[0011] The second magnetic single negative material to the second electric single negative material are configured with M=5 layers;

[0012] The specific positional relationship is: (6→7) L →8→(9→10) M →8→(9→10) M →8→(6→7) L .

[0013] As a preferred embodiment of the photonic crystal solution concentration detection device of this utility model, the tunable semiconductor laser is used to emit electromagnetic waves with tunable wavelengths to provide the required optical signal for detection. The electromagnetic waves emitted by the tunable semiconductor laser are in the infrared spectrum range, with corresponding angular frequencies from 50THz to 70THz.

[0014] In a preferred embodiment of the photonic crystal solution concentration detection device of this utility model, the collimating lens is used to convert the diverging beam emitted by the tunable semiconductor laser into a parallel beam, so that the light can irradiate evenly and parallelly.

[0015] In a preferred embodiment of the photonic crystal solution concentration detection device of this utility model, the polarizer is used to control the polarization direction of the light beam so that the light beam has a specific polarization state.

[0016] The optical modulator is used to modulate the light beam, enabling control and modulation of parameters such as light intensity and frequency, so that the optical signal can be processed and optimized as needed during the detection process.

[0017] In a preferred embodiment of the photonic crystal solution concentration detection device of this utility model, the beam expander is used to enlarge the diameter of the beam, so that the beam can better match the size and structure of the subsequent photonic crystal sensor, and ensure that the beam can uniformly cover the entire effective area of ​​the photonic crystal sensor.

[0018] As a preferred embodiment of the photonic crystal solution concentration detection device of this utility model, the focusing lens is used to focus the emitted light beam after passing through the photonic crystal sensor onto the input port of the spectrometer, so that the light signal can be efficiently coupled into the spectrometer, improving the spectrometer's light signal reception efficiency and detection sensitivity, and ensuring that the spectrometer can accurately measure the spectral information of the transmitted light.

[0019] The spectrometer is used to measure and record the transmission spectrum of electromagnetic waves. It can separate and detect light signals of different wavelengths, convert them into electrical signals, and perform digital processing to obtain spectral data of transmitted light, providing basic data support for subsequent analysis of alcohol solution concentration.

[0020] Compared with the prior art, the advantages of this utility model are:

[0021] Photonic crystals formed by periodically arranging positive and negative refractive index materials have a zero average refractive index bandgap; while photonic crystals formed by periodically arranging two single negative refractive index materials have a zero effective phase bandgap. Photonic crystals composed of two single negative refractive index materials exhibit significant advantages in alcohol concentration sensing: their zero effective phase bandgap is extremely sensitive to changes in the dielectric environment, and by enhancing the local field through surface plasmon resonance, they achieve high sensitivity (up to 2–3 times that of traditional structures) and anti-interference capabilities; simultaneously, the response time of photonic crystals with zero effective phase bandgap to refractive index changes is on the nanosecond scale, and concentration calculation can be achieved with only a fixed wavelength detection, without the need for complex optical systems. In terms of fabrication, traditional photonic crystals require multi-layer, high-precision alternating deposition (such as SiO2 / TiO2), while single negative material photonic crystals can be achieved through metamaterial design (such as metal-dielectric composite structures), requiring only a few simple functional layers to form the effective bandgap; furthermore, through electromagnetic field localization enhancement and process compatibility, they achieve a breakthrough in performance with low cost and easy integration. These characteristics collectively drive its potential application in low-cost, high-precision, and easily integrated alcohol sensors. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0023] Figure 1 This is a structural diagram of the present invention.

[0024] In the diagram: 1. Tunable semiconductor laser; 2. Collimating lens; 3. Polarizer; 4. Optical modulator; 5. Beam expander; 6. First magnetic mononegative material; 7. First electrical mononegative material; 8. Alcohol solution; 9. Second magnetic mononegative material; 10. Second electrical mononegative material; 11. Photonic crystal sensor; 12. Focusing lens; 13. Spectrometer; 14. Computer. Detailed Implementation

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0029] This invention provides a photonic crystal solution concentration detection device. The photonic crystal formed by periodically arranging positive and negative refractive index materials has a zero average refractive index bandgap; while the photonic crystal formed by periodically arranging two single negative refractive index materials has a zero effective phase bandgap. The photonic crystal composed of two single negative refractive index materials exhibits significant advantages in alcohol concentration sensing: its zero effective phase bandgap is extremely sensitive to changes in the dielectric environment, and by enhancing the local field through surface plasmon resonance, it achieves high sensitivity (up to 2-3 times that of traditional structures) and anti-interference performance; at the same time, the response time of the photonic crystal with zero effective phase bandgap to changes in refractive index is in the nanosecond range, and no complex optical system is required. Concentration calculation can be achieved with only fixed wavelength detection. In terms of manufacturing process, traditional photonic crystals require multiple layers of high-precision alternating deposition (such as SiO2 / TiO2), while single negative material photonic crystals can be realized through metamaterial design (such as metal-dielectric composite structures), requiring only a few simple functional layers to form an effective bandgap; at the same time, through electromagnetic field localization enhancement and process compatibility, it achieves a low-cost and easily integrated performance breakthrough. These characteristics collectively drive its potential application in low-cost, high-precision, and easily integrated alcohol sensors.

[0030] Figure 1 The diagram shown is an overall structural schematic of an embodiment of the photonic crystal solution concentration detection device of this utility model. Please refer to [link / reference]. Figure 1 The main structure of this embodiment includes a tunable semiconductor laser 1. A collimating lens 2, a polarizer 3, an optical modulator 4, a beam expander 5, a photonic crystal sensor 11, a focusing lens 12, a spectrometer 13, and a computer 14 are sequentially arranged on the side of the tunable semiconductor laser 1.

[0031] Specifically, the tunable semiconductor laser 1 serves as a light source, capable of emitting electromagnetic waves with tunable wavelengths to provide the required optical signals for detection. The emitted electromagnetic waves are within the infrared spectrum, corresponding to angular frequencies from 50 THz to 70 THz.

[0032] Collimating lens 2 transforms the divergent beam emitted by tunable semiconductor laser 1 into a parallel beam, enabling the light to uniformly and parallelly illuminate subsequent optical elements, ensuring that the propagation direction and shape of the beam meet the detection requirements, improving the quality and stability of the beam, and facilitating subsequent optical processing and measurement.

[0033] Polarizer 3 is used to control the polarization direction of the light beam, giving it a specific polarization state. Because the transmission characteristics of TE and TM modes in photonic crystals are closely related to factors such as the material's refractive index, selecting a suitable polarization mode can better enable the detection of the alcohol solution concentration 8, while also improving the accuracy and sensitivity of the detection.

[0034] The optical modulator 4 modulates the light beam, enabling control and modulation of parameters such as light intensity and frequency. This allows for processing and optimization of the optical signal as needed during the detection process, improving signal quality and detection reliability. It also enables encoding and decoding of the optical signal, facilitating subsequent signal processing and analysis.

[0035] The beam expander 5 enlarges the diameter of the beam, enabling the beam to better match the size and structure of the subsequent photonic crystal sensor 11, ensuring that the beam can uniformly cover the entire effective area of ​​the photonic crystal sensor 11, thereby improving the accuracy and consistency of detection, and also helping to reduce the energy loss of the beam during propagation.

[0036] The first magnetic single-negative material 6, the first electric single-negative material 7, the second magnetic single-negative material 9, and the second electric single-negative material 10 constitute the periodic structural layers of the photonic crystal, which are alternately arranged with the alcohol solution 8 to form a one-dimensional photonic crystal sensor 11. According to the designed structure, the refractive indices of the magnetic single-negative material and the electric single-negative material satisfy the basic properties of single-negative refractive materials, and their periodic layer numbers are L=10 and M=5, respectively. By reasonably selecting and designing the parameters of these materials, a photonic crystal bandgap structure with specific optical properties can be formed. When electromagnetic waves pass through, their transmission spectrum will change due to the influence of the concentration of the alcohol solution 8, thereby realizing the detection of the alcohol solution concentration 8.

[0037] The alcohol solution concentration 8 is the substance to be detected. Its concentration will affect the refractive index distribution of the photonic crystal sensor 11, which will in turn cause changes in the propagation characteristics of electromagnetic waves in the photonic crystal. The concentration of the alcohol solution 8 can be indirectly measured by detecting the changes in the transmission spectrum.

[0038] The photonic crystal sensor 11, composed of a magnetic mononegative material, an electrical mononegative material, and a defect layer of alcohol solution 8, is a one-dimensional photonic crystal structure and is the core component of the entire detector. Its main function is to generate characteristic transmission spectra, which are closely related to the concentration of alcohol solution 8. By analyzing the transmission spectra, quantitative detection of the concentration of alcohol solution 8 can be achieved.

[0039] The focusing lens 12 focuses the outgoing light beam after passing through the photonic crystal sensor 11 onto the input port of the spectrometer 13, so that the light signal can be efficiently coupled into the spectrometer 13, improving the receiving efficiency and detection sensitivity of the spectrometer 13, and ensuring that the spectrometer 13 can accurately measure the spectral information of the transmitted light.

[0040] The spectrometer 13 is used to measure and record the transmission spectrum of electromagnetic waves. It can split and detect light signals of different wavelengths, convert them into electrical signals and perform digital processing to obtain spectral data of transmitted light, providing basic data support for subsequent concentration analysis of alcohol solution 8.

[0041] Computer 14 receives the transmission spectral data transmitted by spectrometer 13, and processes, analyzes and calculates the data according to the pre-established quantitative relationship model between the concentration of alcohol solution 8 and physical parameters such as the peak wavelength of transmitted electromagnetic waves, and finally determines the concentration of alcohol solution 8.

[0042] The tunable semiconductor laser 1 is processed sequentially by a collimating lens 2, a polarizer 3, an optical modulator 4, a beam expander 5, a photonic crystal sensor 11, a focusing lens 12, and a spectrometer 13, and the final signal is processed by a computer 14.

[0043] In practical use, the tunable semiconductor laser 1 generates electromagnetic waves with wavelengths in the infrared spectrum range and emits them to the collimating lens 2. The collimating lens 2 collimates the diverging electromagnetic beam into a parallel beam, which is then adjusted by the polarizer 3 to be polarized into TE (or TM) mode polarized light. The light then enters the optical modulator 4 to modulate parameters such as light intensity or optical frequency. After the modulated beam is expanded by the beam expander 5, it is incident on the one-dimensional photonic crystal sensor 11, which is composed of the first magnetic single negative material 6, the first electrical single negative material 7, the alcohol solution 8, the second magnetic single negative material 9, and the second electrical single negative material 10.

[0044] When electromagnetic waves pass through the photonic crystal sensor 11, they form specific transmission spectral lines. The peak wavelength and full width at half maximum (FWHM) of the transmission spectral lines change accordingly with the concentration of the alcohol solution 8. The emitted beam is focused by the focusing lens 12 and enters the spectrometer 13. The spectrometer 13 performs spectral dispersion and detection on the transmitted light and transmits the measured spectral data to the computer 14. The computer 14 processes and analyzes the spectral data according to a pre-established quantitative relationship model between the concentration of the alcohol solution 8 and the peak wavelength of the transmitted electromagnetic waves, calculates the concentration of the alcohol solution 8, and displays and stores the results.

[0045] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A photonic crystal solution concentration detection device, comprising a tunable semiconductor laser (1), characterized in that, The side of the tunable semiconductor laser (1) is sequentially provided with a collimating lens (2), a polarizer (3), an optical modulator (4), a beam expander (5), a photonic crystal sensor (11), a focusing lens (12), a spectrometer (13), and a computer (14). The tunable semiconductor laser (1) is processed sequentially by a collimating lens (2), a polarizer (3), an optical modulator (4), a beam expander (5), a photonic crystal sensor (11), a focusing lens (12), and a spectrometer (13), and the final signal is processed by a computer (14).

2. The photonic crystal solution concentration detection device according to claim 1, characterized in that, It also includes a first magnetic single negative material (6), a first electric single negative material (7), an alcohol solution (8), a second magnetic single negative material (9), and a second electric single negative material (10).

3. The photonic crystal solution concentration detection device according to claim 2, characterized in that, The photonic crystal sensor (11) is specifically composed of a first magnetic mononegative material (6), a first electrical mononegative material (7), an alcohol solution (8), a second magnetic mononegative material (9), and a second electrical mononegative material (10).

4. The photonic crystal solution concentration detection device according to claim 3, characterized in that, The internal connection relationship of the photonic crystal sensor (11) is as follows: The first magnetic single negative material (6) to the first electric single negative material (7) are configured with a layer number of L=10 layers; The second magnetic single negative material (9) to the second electric single negative material (10) are configured with a layer number of M=5 layers.

5. The photonic crystal solution concentration detection device according to claim 1, characterized in that, The tunable semiconductor laser (1) is used to emit electromagnetic waves with tunable wavelengths to provide the required optical signal for detection. The electromagnetic waves emitted by the tunable semiconductor laser (1) are in the infrared spectrum range, with corresponding angular frequencies from 50 THz to 70 THz.

6. The photonic crystal solution concentration detection device according to claim 1, characterized in that: The collimating lens (2) is used to transform the divergent beam emitted by the tunable semiconductor laser (1) into a parallel beam, so that the light can be uniformly and parallelly irradiated.

7. The photonic crystal solution concentration detection device according to claim 1, characterized in that: The polarizer (3) is used to control the polarization direction of the beam so that the beam has a specific polarization state; The optical modulator (4) is used to modulate the light beam, and can control and modulate the light intensity and optical frequency parameters so that the optical signal can be processed and optimized as needed during the detection process.

8. The photonic crystal solution concentration detection device according to claim 1, characterized in that: The beam expander (5) is used to expand the diameter of the beam so that the beam can better match the size and structure of the subsequent photonic crystal sensor (11) and ensure that the beam can uniformly cover the entire effective area of ​​the photonic crystal sensor (11).

9. The photonic crystal solution concentration detection device according to claim 1, characterized in that: The focusing lens (12) is used to focus the outgoing light beam after passing through the photonic crystal sensor (11) onto the input port of the spectrometer (13), so that the light signal can be efficiently coupled into the spectrometer (13), improving the receiving efficiency and detection sensitivity of the spectrometer (13) for the light signal, and ensuring that the spectrometer (13) can accurately measure the spectral information of the transmitted light. The spectrometer (13) is used to measure and record the transmission spectrum of electromagnetic waves. It can split and detect light signals of different wavelengths, convert them into electrical signals and perform digital processing to obtain the spectral data of transmitted light, providing basic data support for the subsequent concentration analysis of alcohol solution (8).

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