Zeeman effect testing system and method for magnetic circular polarization luminescent material

Abstract

The invention provides a Zeeman effect test system and method for a magnetic circularly polarized luminescent material, and the system is characterized in that a sample is placed on a magnetic sample stage, exciting light emitted by a light source module irradiates the surface of the sample on the magnetic sample stage, and the sample is excited to emit circularly polarized light; circularly polarized light is input into the signal testing end, and after screening in different polarization directions is carried out by the signal testing end, fluorescence emission spectrums corresponding to left-hand circularly polarized light and right-hand circularly polarized light are obtained; and analyzing the fluorescence emission spectrums of the left-handed circularly polarized light and the right-handed circularly polarized light by using a spectrum analysis end to determine a Zeeman effect test result of the sample. According to the system and the method, a relatively wide test parameter adjustment range can be provided, each element in the system can be flexibly adjusted, the use is convenient, the implementation is easy, and the accuracy of test data can be improved while high-efficiency test is provided.

Description

Technical Field

[0001] The present invention relates to the field of light detection technology, and in particular to a Zeeman effect testing system and method for magnetic circularly polarized luminescent materials. Background Art

[0002] The Zeeman effect is the process in which the excited state energy level of a luminescent material splits under the action of excitation light and magnetic field, from a degenerate state to a non-degenerate state. Due to the different orbital angular momentums corresponding to different energy levels, when the higher energy state of the material being tested is excited back to the ground state, it emits left-handed / right-handed circularly polarized light, and when the lower energy state is excited back to the ground state, it emits right-handed / left-handed circularly polarized light. The two have different energies, and the Zeeman splitting energy difference is quantitatively obtained by measuring the difference in left-handed and right-handed circularly polarized energy levels.

[0003] The circularly polarized luminescence spectrometer in the prior art measures the intensity difference spectrum of left-handed and right-handed circularly polarized light and the total fluorescence intensity spectrum, and then uses the luminescence asymmetry factor to characterize the Zeeman effect. However, if the laser light source is too strong, it is easy to damage the detector and may affect the service life of the detector. In addition, the circularly polarized luminescence spectrometer cannot meet the flexibility requirements of the analysis and research of the magneto-optical properties of materials.

[0004] Therefore, the prior art needs to be further improved. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a system and method for testing the Zeeman effect of magnetic circularly polarized luminescent materials, so as to solve the problem that the circularly polarized luminescence spectrometer used in the prior art cannot meet the demand for flexibility testing and analysis of the magneto-optical properties of materials.

[0006] In a first aspect, this embodiment provides a Zeeman effect test system for magnetic circularly polarized luminescent materials, which includes: a light source module, a magnetic sample stage, a signal test end, and a spectrum analysis end;

[0007] The magnetic sample stage is located on the emission light path of the light source module, and the excitation light emitted by the light source module is irradiated onto the magnetic sample stage, and the sample on the magnetic sample stage is excited to emit circularly polarized light; wherein the sample is a magnetic circularly polarized luminescent material;

[0008] The signal test end is arranged on the optical path of the circularly polarized light emitted by the sample, and the circularly polarized light is input to the signal test end, and after being adjusted to different polarization directions by the signal test end, fluorescence emission spectra corresponding to left-handed circularly polarized light and right-handed circularly polarized light are obtained;

[0009] The spectrum analysis end is connected to the signal testing end to obtain the fluorescence emission spectra corresponding to the left-handed circularly polarized light and the right-handed circularly polarized light, and determine the Zeeman effect test result of the sample based on the fluorescence emission spectra corresponding to the left-handed circularly polarized light and the right-handed circularly polarized light.

[0010] Optionally, a transmission direction of the excitation light in the light source module and an input direction of the circularly polarized light input to the signal test end form a preset angle value, and the preset angle is not a straight angle.

[0011] Optionally, the light source module is a narrow-bandwidth linearly polarized light source module or a circularly polarized light source module.

[0012] Optionally, the light source module comprises: a luminous light source, a bandpass filter, a first polarizer, and a lens assembly arranged in sequence; or the light source module comprises: a luminous light source, a bandpass filter, a first polarizer, a first 1 / 4 wave plate, and a lens assembly arranged in sequence;

[0013] The light source is a laser or LED continuous light source, which is used to emit continuous light;

[0014] The bandpass filter receives the continuous light emitted by the light source, performs wavelength filtering on the continuous light, filters out the light with the same wavelength as the fluorescence emission band, prevents it from entering the subsequent light path and introducing the background, and outputs filtered light with a narrow bandwidth; the first polarizer receives the filtered light, performs polarization modulation on the filtered light, and outputs linearly polarized light;

[0015] The linearly polarized light output by the first polarizer is input into the lens assembly to obtain the excitation light output by the lens assembly;

[0016] Alternatively, the linearly polarized light output by the first polarizer is input to a first quarter wave plate to obtain circularly polarized light output by the first quarter wave plate;

[0017] The circularly polarized light output by the first 1 / 4 wave plate is input to the lens assembly to obtain the excitation light output by the lens assembly.

[0018] Optionally, the lens assembly comprises: a first lens, a light emitting tube, a second lens, a third lens and a fourth lens arranged in sequence;

[0019] The linearly polarized light or circularly polarized light is outputted through the first lens, the light output tube, the second lens, the third lens and the fourth lens in sequence.

[0020] Optionally, the magnetic sample stage comprises: a fixed frame, two opposing permanent magnets and a sample slot located above the fixed frame; a hollow structure is formed between the two opposing permanent magnets, and the sample slot is located in the hollow structure between the permanent magnets.

[0021] Optionally, the sample slot is a plastic groove, the number of permanent magnets is two, and the plastic groove is embedded between the two permanent magnets.

[0022] Optionally, the signal test end includes: a fifth lens, a second 1 / 4 wave plate, a second polarizer, a fiber collimator and a fiber spectrometer;

[0023] The fifth lens is used to receive the circularly polarized light, focus the circularly polarized light, and then output it to the second quarter wave plate;

[0024] The second quarter wave plate is used to convert the circularly polarized fluorescence emitted by the input sample into linearly polarized fluorescence, and output it to the second polarizer;

[0025] The second polarizer is used to perform polarization screening at different angles on the linearly polarized light to output linear polarized light corresponding to left-handed circularly polarized light and right-handed circularly polarized light respectively, and the linear polarized light corresponding to the left-handed circularly polarized light and right-handed circularly polarized light is input into the optical fiber collimator;

[0026] The optical fiber collimator is used to collimate the linear polarized light corresponding to the received left-handed circularly polarized light and right-handed circularly polarized light, and input the collimated fluorescence signal into the optical fiber spectrometer;

[0027] The optical fiber spectrometer is used to receive the fluorescence signal after the collimation process and obtain the fluorescence emission spectra corresponding to the left-handed circularly polarized light and the right-handed circularly polarized light.

[0028] Optionally, the spectral analysis end is used to obtain the fluorescence emission spectra corresponding to the left-handed circularly polarized light and the right-handed circularly polarized light, and calculate the Zeeman splitting energy difference based on the peak wavelengths of the left-handed fluorescence emission spectrum and the right-handed fluorescence emission spectrum.

[0029] In a second aspect, this embodiment discloses a method for testing the Zeeman effect of a magnetic circularly polarized luminescent material, wherein the Zeeman effect testing method comprises:

[0030] The excitation light emitted by the light source module is irradiated onto the magnetic sample stage, and the sample on the magnetic sample stage is excited to emit circularly polarized light; wherein the sample is a magnetic circularly polarized luminescent material;

[0031] The circularly polarized light is input to the signal test end, and after being adjusted to different polarization directions by the signal test end, a fluorescence emission spectrum corresponding to left-handed circular polarization and right-handed circular polarization is obtained;

[0032] The spectrum analysis end obtains fluorescence emission spectra corresponding to left-handed circular polarization and right-handed circular polarization, and determines the Zeeman effect test result of the sample based on the left-handed circular polarization fluorescence spectrum and the right-handed circular polarization fluorescence spectrum.

[0033] Beneficial effect: The present invention provides a Zeeman effect test system and method for magnetic circularly polarized luminescent materials. The system uses linearly polarized or circularly polarized excitation light emitted by a light source module to illuminate the sample surface on a magnetic sample stage, and the sample is excited to emit circularly polarized fluorescence; the circularly polarized fluorescence is input to the signal test end, and after being screened by the signal test end in different polarization directions, the fluorescence emission spectra corresponding to left-handed circularly polarized light and right-handed circularly polarized light are obtained; the fluorescence emission spectra of left-handed circularly polarized light and right-handed circularly polarized light are analyzed by the spectrum analysis end to determine the Zeeman effect test results of the sample. The system and method of the present invention can obtain the magneto-optical properties corresponding to the sample based on the measured Zeeman effect test results, which provides a guarantee for a comprehensive understanding and use of the materials corresponding to the sample. Furthermore, the implementation system and method can provide a relatively wide range of test parameter adjustment, and each component can be flexibly adjusted, easy to use, and easy to implement. It can not only provide efficient testing, but also improve the accuracy of test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Schematic diagram of the structure of the Zeeman effect test system for magnetic circularly polarized luminescent materials provided in this embodiment;

[0035] Figure 2a and Figure 2b They are the fluorescence emission spectra of the complex formed by the dye polymer Thioflavin T enriched by magnetic materials, and the Zeeman splitting energy differences at 1.2T and 0.3T magnetic field strengths and in SN and NS magnetic field directions are quantitatively obtained;

[0036] Figure 3a and Figure 3b They are respectively the left-right hand fluorescence emission spectra of ferroferric oxide enriched with thioflavin T in different magnetic fields after being wrapped by silicon dioxide, and the Zeeman splitting energy differences in 1.2T and 0.3T magnetic field strengths and in SN and NS magnetic field directions are quantitatively obtained;

[0037] Figure 4 It is a flow chart of the steps of the Zeeman effect testing method of the magnetic circularly polarized luminescent material provided in this embodiment. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention clearer and more specific, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] The excited state energy level of magnetic circularly polarized luminescent materials will split under the combined action of excitation light and external magnetic field, thus producing the Zeeman effect. The Zeeman effect reflects the complexity of the interaction between the internal electronic structure of the material and the magnetic field. Therefore, testing and analyzing the Zeeman effect of the material can determine the magnetic and optical properties of the material, and then apply it to different fields based on the magnetic and optical properties of the material. In the prior art, magnetic circularly polarized luminescent materials are widely used in scientific research and industrial applications in the fields of physics, chemistry and biomedicine.

[0040] In the prior art, the Zeeman effect of luminescent materials is generally studied by using an existing circularly polarized luminescence spectrometer to obtain the intensity difference spectrum of left-right polarized light and the total fluorescence intensity spectrum, and then measure the luminescence asymmetry factor. To characterize the size of the Zeeman effect (where ΔI is the intensity difference between left-handed and right-handed polarized light, and I is the total fluorescence intensity), it is impossible to intuitively obtain the strength of the Zeeman effect of the material under the magnetic field. Moreover, the intensity of the laser light source of the existing circularly polarized luminescence spectrometer is too strong. When the detector is used to collect the spectrum, it is easy to cause damage to the detector, affecting its service life, and also affecting the accurate analysis of the received spectral signal. The structure of the spectrometer is complex and cannot meet the flexible requirements of the analysis and research of the magneto-optical properties of materials, such as different sample forms, different magnetic field sizes and directions. Therefore, the Zeeman effect test system and method in the prior art cannot meet the requirements of accuracy, reliability and flexibility.

[0041] In order to overcome the above-mentioned problems in the prior art, the present invention provides a Zeeman effect test system and method for magnetic circularly polarized luminescent materials. By constructing a test system consisting of a light source module, a magnetic sample stage, a signal test end and a spectrum analysis end, the excitation light emitted by the light source module is incident on a sample located on the magnetic sample stage, and the sample emits circularly polarized light under the excitation light and the magnetic field of the sample stage, and the circularly polarized light is output under the action of the signal test end to obtain fluorescence emission spectra corresponding to left-handed circularly polarized light and right-handed circularly polarized light, and the spectrum analysis end analyzes the fluorescence emission spectra corresponding to left-handed circularly polarized light and right-handed circularly polarized light to obtain Zeeman effect test results. The system and method of this embodiment are simple in structure and easy to implement, and can provide a wide range of test parameter adjustment ranges, and the wavelength of the excitation light output by the light source component, the polarization state of the light, the magnetic field direction and intensity, etc. can be flexibly adjusted according to test requirements, so it can be applicable to Zeeman effect test requirements for various circular magnetic polarization materials.

[0042] The Zeeman effect testing system and method for magnetic circularly polarized luminescent materials provided by the present invention will be further described in detail below in conjunction with the accompanying drawings of the specification.

[0043] In the first aspect, this embodiment provides a Zeeman effect test system for magnetic circularly polarized luminescent materials, combining Figure 1As shown, it includes: a light source module, a magnetic sample stage, a signal testing end and a spectrum analysis end.

[0044] The light source module is used to output excitation light, wherein a light source is provided, and the light source can be a laser or a continuous light source. Such as ultraviolet LED, xenon lamp, 633nm helium-neon laser and other continuous light sources. In order to filter out the light of the same wavelength as the fluorescence emission band, to prevent it from entering the subsequent light path and introducing the background, and outputting filtered light with a narrow bandwidth, a bandpass filter that is adapted to the absorption wavelength of the sample to be tested is also provided on the light path of the light source in this embodiment.

[0045] The magnetic sample stage is located on the propagation light path of the light source module. The excitation light emitted by the light source module is irradiated onto the magnetic sample stage, and the sample on the magnetic sample stage is excited to emit circularly polarized light. The sample is a magnetic circularly polarized luminescent material.

[0046] The magnetic sample stage is located on the optical path of the excitation light transmission, a sample is placed on the sample stage, and the excitation light is irradiated onto the surface of the sample. Under the combined action of the excitation light and the magnetic field of the magnetic sample stage, the sample emits a circularly polarized fluorescence signal.

[0047] Furthermore, the magnetic sample stage is not only used to carry samples, but also to provide a magnetic field for the samples, so that the samples are excited under the action of the magnetic field and the excitation light. Therefore, the magnetic sample stage can be a permanent magnet with its own magnetism or can be realized by setting up a magnetic field around the sample stage. In one implementation, the magnetic sample stage is a permanent magnet with a hole in the middle, and a sample holder is arranged in the center of the sample stage. The sample is placed on the sample holder. During the test, the liquid or gel sample is added to a quartz cuvette that is transparent on all four sides and placed in the sample holder in the middle of the magnetic sample stage.

[0048] The signal test end is arranged on the optical path of the circularly polarized light. The circularly polarized fluorescence is input to the signal test end. After being adjusted to different polarization directions by the signal test end, fluorescence emission spectra corresponding to left-handed circular polarization and right-handed circular polarization are obtained.

[0049] The signal test end receives the circularly polarized light emitted by the sample after being excited. The signal test end collects the circularly polarized light with a lens, and converts the circularly polarized light into linearly polarized light with a 1 / 4 wave plate. The linear polarized light is then filtered into linear polarized light corresponding to left-handed circularly polarized light and right-handed circularly polarized light through two linear polarizers at different angles. After being collimated by a fiber collimator, the linear polarized light is received by a fiber spectrometer to obtain the fluorescence emission spectra corresponding to left-handed circularly polarized light and right-handed circularly polarized light.

[0050] The spectrum analysis end is connected to the signal test end to obtain the fluorescence emission spectra corresponding to the left-handed circularly polarized light and the right-handed circularly polarized light, and determine the Zeeman effect test result of the sample based on the fluorescence emission spectra of the left-handed circularly polarized light and the right-handed circularly polarized light.

[0051] The spectrum analysis end and the signal test end are connected by an optical fiber, and are used to receive the fluorescence emission spectrum corresponding to the left-handed circularly polarized light and the fluorescence emission spectrum corresponding to the right-handed circularly polarized light from the signal test end, analyze the fluorescence emission spectrum corresponding to the left-handed circularly polarized light, and then obtain the Zeeman effect test result. The spectrum analysis end can be an intelligent device with data processing function, such as a computer or a processor.

[0052] In detail, combined Figure 1 The test system structure schematic diagram shown in FIG. 1 further illustrates the system of this embodiment.

[0053] When the signal test end collects the circularly polarized light emitted by the sample at an angle of 180 degrees, the excitation light emitted by the light source module and the circularly polarized light emitted by the sample are on the same horizontal line. Therefore, the strong intensity of the excitation light may cause damage to the components receiving light in the signal test end, thereby affecting its service life and the test accuracy of the sample signal. Therefore, when adjusting the light transmission direction, the transmission direction of the excitation light in the light source module and the input direction of the circularly polarized light input to the signal test end are set to a preset angle value, and the preset angle is not a straight angle. This avoids the excitation light and the circularly polarized light emitted by the sample being on the same horizontal line, which may damage the components in the signal test end due to excessive excitation light.

[0054] Furthermore, in order to obtain better excitation light, the light source module is a narrow bandwidth linear polarization light source module or a circular polarization light source module. Figure 1 As shown, the light source module includes: a luminous light source 1, a bandpass filter 2, a first polarizer 3 and a lens assembly arranged in sequence. Alternatively, the light source module contains a first 1 / 4 wave plate, and the light source module includes: a luminous light source 1, a bandpass filter 2, a first polarizer 3, a first 1 / 4 wave plate 4 and a lens assembly arranged in sequence.

[0055] The luminous light source 1 is a laser or LED continuous light source, which is used to emit continuous light; the bandpass filter 2 receives the continuous light emitted by the luminous light source 1, and filters the continuous light to obtain a narrow-bandwidth high-energy excitation light source. When the light source assembly does not contain the first 1 / 4 wave plate, the first polarizer 3 receives the filtered light, polarizes the filtered light, and outputs linearly polarized light. The linearly polarized light output by the first polarizer is input to the lens assembly to obtain the linearly polarized narrow-bandwidth high-energy excitation light output by the lens assembly. When the light source assembly contains the first 1 / 4 wave plate 4, the first polarizer 3 outputs linearly polarized light and inputs it to the first 1 / 4 wave plate 4; the circularly polarized light output by the first 1 / 4 wave plate 4 is input to the lens assembly to obtain the circularly polarized narrow-bandwidth high-energy excitation light output by the lens assembly.

[0056] After the continuous light emitted by the luminescent light source passes through the bandpass filter, the central wavelength of the continuous light becomes narrower and the energy is enhanced. In specific implementation, the luminescent light source 1 is a 365nm ultraviolet LED light source, which can be equipped with a 370nm bandpass filter with the central wavelength of the excitation wavelength of the sample to be tested.

[0057] Furthermore, the lens assembly comprises: a first lens 5, a light emitting tube 6, a second lens 7, a third lens 8 and a fourth lens 9 which are arranged in sequence.

[0058] The linearly polarized light or circularly polarized light is outputted through the first lens 5 , the light output tube 6 , the second lens 7 , the third lens 8 and the fourth lens 9 in sequence.

[0059] After the linearly polarized light emitted by the light source passes through the first lens, the light output tube and the second lens, the emission loss is reduced. After being focused by the third lens and the fourth lens in sequence, it becomes a high-energy extremely small light spot focused on the sample in the center of the sample stage.

[0060] Specifically, the magnetic sample stage includes: a fixed frame 12, at least two permanent magnets 10 and a sample slot 11 located above the fixed frame 12; a hollow structure is provided between the at least two permanent magnets, and the sample slot 11 is located in the hollow structure between the permanent magnets. The number of the permanent magnets is an even number, and the permanent magnets are rectangular parallelepiped structures. The permanent magnets of the even number of rectangular parallelepiped structures are divided into two parts and placed at a preset length. The preset length of the interval between the two parts of the permanent magnets forms a groove, and the sample is placed in the groove, thereby realizing that the sample is in the magnetic field of the permanent magnet. In one implementation, the sample slot 11 is a plastic groove, the number of the permanent magnets is two (one is placed on the left and right respectively), and the plastic groove is embedded in the hollow structure between the two permanent magnets. The relative direction of the magnetic field and the optical path propagation can be changed by adjusting the magnetic strength and direction of the permanent magnet.

[0061] In detail, the signal test end includes: a fifth lens 13 , a second quarter wave plate 14 , a second polarizer 15 , a fiber collimator 16 and a fiber spectrometer 18 .

[0062] The fifth lens 13 is used to receive the circularly polarized light emitted by the sample when it is excited, focus the circularly polarized light, and then output it to the second quarter wave plate 14 .

[0063] The second quarter wave plate 14 is used to convert the input circularly polarized light into linearly polarized light, and output the linearly polarized light to the second polarizer 15 .

[0064] The second polarizer 15 is used to perform polarization processing on the linearly polarized light at different angles to respectively select linearly polarized fluorescence corresponding to left-handed circularly polarized light and right-handed circularly polarized light, and the output linearly polarized fluorescence corresponding to left-handed circularly polarized light and right-handed circularly polarized light is input into the optical fiber collimator 16 .

[0065] The optical fiber collimator 16 is used to collimate the linearly polarized fluorescence corresponding to the received left-handed circularly polarized light and right-handed circularly polarized light, and then input the collimated fluorescence into the optical fiber spectrometer 19 .

[0066] The optical fiber spectrometer 19 is used to receive the linearly polarized fluorescence signal after the collimation process, and obtain the fluorescence emission spectra corresponding to the left-handed circularly polarized light and the right-handed circularly polarized light.

[0067] In this embodiment, since the direction between the signal test end and the sample excitation light is not set horizontally, the angle between the signal test end and the sample excitation light is not in a straight line. In one implementation, the direction of the sample surface excitation light is at a 90-degree angle to the fifth lens, and the fifth lens is perpendicular to the light propagation path of the sample surface excitation light. While avoiding the influence of the strong excitation light on the test results, it is ensured that more fluorescence emission signals are received. The fifth lens collects the circularly polarized light emitted by the sample, focuses it, and transmits it to the second 1 / 4 wave plate. The second 1 / 4 wave plate is at a 45-degree angle to the fast axis, and converts the input circularly polarized light into linearly polarized light.

[0068] The linear polarized light output from the second quarter wave plate can be screened to obtain linear polarized light corresponding to left-handed fluorescent signal and right-handed fluorescent signal after polarization adjustment by the second polarizer. Specifically, if the second polarizer is 45 degrees to the fast axis, the linear polarized light output by the second polarizer is corresponding to the right-handed fluorescent signal. If the second polarizer is 135 degrees to the fast axis, the linear polarized light output by the second polarizer is corresponding to the left-handed fluorescent signal. Figure 1 As shown, the linear polarized light corresponding to the left-handed fluorescence signal and the linear polarized light corresponding to the right-handed fluorescence output by the second polarizer 15 can be collimated by the optical fiber collimator 16 and then transmitted to the optical fiber spectrometer 18 by the transmission optical fiber 17 .

[0069] Furthermore, the spectral analysis end is used to obtain the fluorescence emission spectrum corresponding to the left-handed circularly polarized light and the fluorescence emission spectrum corresponding to the right-handed circularly polarized light, and calculate the Zeeman effect test result according to the peak wavelengths of the fluorescence emission spectrum corresponding to the left-handed circularly polarized light and the fluorescence emission spectrum corresponding to the right-handed circularly polarized light.

[0070] Specifically, the spectrum analysis end can obtain the fluorescence emission spectrum corresponding to left / right circularly polarized light with a high signal-to-noise ratio by adjusting the optimal excitation light power and collecting the average of multiple emission spectra. The Zeeman splitting energy difference can be directly obtained according to the energy value corresponding to the peak wavelength of the left-right circularly polarized light emission spectrum, and its calculation formula is:

[0071]

[0072] Where, ΔE Zeeman is the Zeeman splitting energy difference, LCP is the peak wavelength of the fluorescence emission spectrum of left-handed circularly polarized light, and RCP is the peak wavelength of the fluorescence emission spectrum of right-handed circularly polarized light.

[0073] Figure 2a and Figure 2b The fluorescence emission spectrum of the complex formed by Fe3O4-THT magnetic material enriched with dye polymer Thioflavin T is obtained quantitatively, and the Zeeman splitting energy difference under 1.2T and 0.3T magnetic field strength and SN and NS magnetic field directions is obtained. Figure 2a The test shows that under the magnetic field strength of 1.2T and the magnetic field direction of NS, the peak wavelength of the RCP left-handed circularly polarized fluorescence spectrum emitted by the Fe3O4-THT sample is 467.643nm, and the peak wavelength of the LCP left-handed circularly polarized fluorescence spectrum is 468.109nm. Substituting it into the formula, the Zeeman splitting energy difference is obtained.

[0074] Figure 3a and Figure 3b They are the fluorescence emission spectra of the Fe3O4@SiO2-THT magnetic material protected by silica and then enriched with the dye polymer Thioflavin T to form a complex, and the Zeeman splitting energy differences at 1.2T and 0.3T magnetic field intensities and in SN and NS magnetic field directions are quantitatively obtained.

[0075] The test system provided in this embodiment can directly obtain the strength of the Zeeman effect under a magnetic field by calculating the displacement of the emission peak of the left-handed circularly polarized fluorescence emission spectrum and the emission peak of the right-handed circularly polarized fluorescence emission spectrum of the sample. The excitation light source is at a 90-degree angle to the sample emission signal test end, which effectively avoids overexposure of the excitation light source to damage the signal test end and affect the test results. The wavelength and polarization state of the excitation light source can be flexibly changed to meet the various needs of experimental research. This system has a low construction cost and relatively simple test operation. It has important application value in the research of the fluorescence Zeeman effect of magnetic circularly polarized luminescent materials in the fields of magneto-optical materials, quantum information, biomedicine, etc., and can provide a theoretical basis for the more accurate use of magnetic circularly polarized luminescent materials.

[0076] In a second aspect, this embodiment discloses a method for testing the Zeeman effect of a magnetic circularly polarized luminescent material, such as Figure 4 The Zeeman effect testing method comprises:

[0077] Step S1, the excitation light emitted by the light source module is irradiated onto the magnetic sample stage, and the sample on the magnetic sample stage is excited to emit circularly polarized light; wherein the sample is a magnetic circularly polarized luminescent material.

[0078] Step S2, the circularly polarized light is input to the signal test end, and after being adjusted to different polarization directions by the signal test end, fluorescence emission spectra corresponding to left-handed circularly polarized light and right-handed circularly polarized light are obtained.

[0079] Step S3, the spectrum analysis end obtains the fluorescence emission spectra corresponding to the left-handed circularly polarized light and the right-handed circularly polarized light, and determines the Zeeman effect test result of the sample based on the fluorescence emission spectra corresponding to the left-handed circularly polarized light and the right-handed circularly polarized light.

[0080] Furthermore, the transmission direction of the excitation light in the light source module and the input direction of the circularly polarized light input to the signal test end are at a preset angle, and the preset angle is not a straight angle. In the specific implementation, in step S2, the circularly polarized light is controlled to be input to the signal test end at an angle of 90 degrees.

[0081] Further, the light source module comprises: a luminous light source, a bandpass filter, a first polarizer, and a lens assembly arranged in sequence; or, the light source module comprises: a luminous light source, a bandpass filter, a first polarizer, a first 1 / 4 wave plate, and a lens assembly arranged in sequence;

[0082] The light source is a laser or LED continuous light source, which is used to emit continuous light;

[0083] The bandpass filter receives the continuous light emitted by the light source, performs wavelength filtering on the continuous light, filters out the light with the same wavelength as the fluorescence emission band, prevents it from entering the subsequent light path and introducing background, and outputs filtered light with a narrow bandwidth;

[0084] The first polarizer receives the filtered light, performs polarization modulation on the filtered light, and outputs linearly polarized light;

[0085] The linearly polarized light output by the first polarizer is input to the lens assembly to obtain the excitation light in a linear polarization state output by the lens assembly.

[0086] Alternatively, the linearly polarized light output by the first polarizer is input to a first quarter wave plate to obtain circularly polarized light output by the first quarter wave plate;

[0087] The circularly polarized light output by the first 1 / 4 wave plate is input to the lens assembly to obtain the circularly polarized excitation light output by the lens assembly.

[0088] Furthermore, the lens assembly comprises: a first lens, a light emitting tube, a second lens, a third lens and a fourth lens arranged in sequence;

[0089] The linearly polarized light or circularly polarized light is outputted through the first lens, the light output tube, the second lens, the third lens and the fourth lens in sequence.

[0090] Furthermore, the magnetic sample stage comprises: a fixed frame, two opposing permanent magnets and a sample slot located above the fixed frame; a hollow structure is formed between the two opposing permanent magnets, and the sample slot is located in the hollow structure between the permanent magnets.

[0091] Furthermore, the sample slot is a plastic groove, the number of permanent magnets is two, and the plastic groove is embedded between the two permanent magnets.

[0092] Further, the signal test end includes: a fifth lens, a second 1 / 4 wave plate, a second polarizer, a fiber collimator and a fiber spectrometer;

[0093] The fifth lens is used to receive the circularly polarized light, focus the circularly polarized light, and then output it to the second quarter wave plate;

[0094] The second quarter wave plate is used to convert the input circularly polarized light into linearly polarized light and output it to the second polarizer;

[0095] The second polarizer is used to perform polarization processing at different angles on the linearly polarized light to respectively select linearly polarized fluorescence corresponding to left-handed circularly polarized light and right-handed circularly polarized light, and the linearly polarized light corresponding to the left-handed circularly polarized light and right-handed circularly polarized light is output to the optical fiber collimator;

[0096] The optical fiber collimator is used to collimate the linear polarized light corresponding to the received left-handed circularly polarized light and right-handed circularly polarized light, and then output it to the optical fiber spectrometer;

[0097] The optical fiber spectrometer is used to receive fluorescence signals and obtain fluorescence emission spectra corresponding to left-handed circularly polarized light and right-handed circularly polarized light.

[0098] Furthermore, the spectral analysis end is used to obtain the fluorescence emission spectra corresponding to the left-handed circularly polarized light and the right-handed circularly polarized light, and calculate the Zeeman splitting energy difference based on the peak values ​​of the left-handed fluorescence emission spectrum and the right-handed fluorescence emission spectrum.

[0099] The present invention provides a Zeeman effect test system and method for magnetic circularly polarized luminescent materials. The system only includes a light source module, a magnetic sample stage, a signal test end and a spectrum analysis end, so the structure is simple, the optical path design is concise, easy to implement and control, and the experimental cost is reduced and the experimental efficiency is improved. Since the excitation light wavelength, polarization state, magnetic field direction and intensity of the magnetic sample stage emitted by the sample in the light source module and the magnetic sample stage can be adjusted according to different luminescent materials and experimental conditions, the implementation system and method can provide a relatively wide range of test parameter adjustment, simple operation, convenient use, and wide application. Not only can efficient spectrum test analysis efficiency be achieved, but also the accuracy of test analysis data can be improved, so it can be applied to various fields of magneto-optical materials.

[0100] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the claims attached to the present invention.

Claims

1. A Zeeman effect test system for magnetic circularly polarized luminescent materials, characterized in that: include: Light source module, magnetic sample stage, signal test end and spectrum analysis end; The magnetic sample stage is located on the propagation light path of the light source module, and the excitation light emitted by the light source module is irradiated onto the magnetic sample stage, and the sample on the magnetic sample stage is excited to emit circularly polarized light; wherein the sample is a magnetic circularly polarized luminescent material; The signal test end is arranged on the optical path of the circularly polarized light emitted by the sample, and the circularly polarized light is input to the signal test end, and after being adjusted to different polarization directions by the signal test end, fluorescence emission spectra corresponding to left-handed circularly polarized light and right-handed circularly polarized light are obtained; The spectrum analysis end is connected to the signal testing end to obtain the fluorescence emission spectra corresponding to the left-handed circularly polarized light and the right-handed circularly polarized light, and determine the Zeeman effect test result of the sample based on the fluorescence emission spectra corresponding to the left-handed circularly polarized light and the right-handed circularly polarized light.

2. The Zeeman effect test system of magnetic circularly polarized luminescent material according to claim 1, characterized in that: There is a preset angle between the transmission direction of the excitation light in the light source module and the input direction of the circularly polarized light input to the signal test end, and the preset angle is not a straight angle.

3. The Zeeman effect test system of magnetic circularly polarized luminescent material according to claim 1, characterized in that: The light source module is a narrow-bandwidth linear polarization light source module or a circular polarization light source module.

4. The Zeeman effect test system of magnetic circularly polarized luminescent material according to claim 3, characterized in that: The light source module comprises: a luminous light source, a bandpass filter, a first polarizer, and a lens assembly arranged in sequence; or, the light source module comprises: a luminous light source, a bandpass filter, a first polarizer, a first 1 / 4 wave plate, and a lens assembly arranged in sequence; The light source is a laser or LED continuous light source, which is used to emit continuous light; The bandpass filter receives the continuous light emitted by the light source, performs wavelength filtering on the continuous light, and outputs filtered light; The first polarizer receives the filtered light, performs polarization modulation on the filtered light, and outputs linearly polarized light; The linearly polarized light output by the first polarizer is input into the lens assembly to obtain the excitation light output by the lens assembly; Alternatively, the linearly polarized light output by the first polarizer is input to a first quarter wave plate to obtain circularly polarized light output by the first quarter wave plate; The circularly polarized light output by the first 1 / 4 wave plate is input to the lens assembly to obtain the excitation light output by the lens assembly.

5. The Zeeman effect test system of magnetic circularly polarized luminescent material according to claim 4, characterized in that: The lens assembly comprises: a first lens, a light emitting tube, a second lens, a third lens and a fourth lens arranged in sequence; The linearly polarized light or circularly polarized light is outputted through the first lens, the light output tube, the second lens, the third lens and the fourth lens in sequence.

6. The Zeeman effect test system of magnetic circularly polarized luminescent material according to claim 1, characterized in that: The magnetic sample stage comprises: a fixing frame, at least two opposite permanent magnets located above the fixing frame and a sample slot; a hollow structure is formed between the at least two opposite permanent magnets, and the sample slot is located in the hollow structure between the permanent magnets.

7. The Zeeman effect test system of magnetic circularly polarized luminescent material according to claim 6, characterized in that: The sample slot is a plastic groove, the number of the permanent magnets is two, and the plastic groove is embedded in the hollow structure between the two permanent magnets.

8. The Zeeman effect test system of magnetic circularly polarized luminescent material according to claim 1, characterized in that: The signal test end comprises: a fifth lens, a second quarter wave plate, a second polarizer, a fiber collimator and a fiber spectrometer; The fifth lens is used to receive the circularly polarized light, focus the circularly polarized light, and then output it to the second quarter wave plate; The second quarter wave plate is used to convert the input circularly polarized light into linearly polarized light and output it to the second polarizer; The second polarizer is used to perform polarization processing at different angles on the linearly polarized light to respectively select linearly polarized fluorescence corresponding to left-handed circularly polarized light and right-handed circularly polarized light, and the linear polarized light corresponding to the left-handed circularly polarized light and right-handed circularly polarized light is output to the optical fiber collimator; The optical fiber collimator is used to collimate the linear polarized light corresponding to the received left-handed circularly polarized light and right-handed circularly polarized light, and output the collimated fluorescence signal to the optical fiber spectrometer; The fiber optic spectrometer is used to receive the fluorescence signal input by the fiber optic collimator and obtain the fluorescence emission spectra corresponding to the left-handed circularly polarized light and the right-handed circularly polarized light.

9. The Zeeman effect test system of magnetic circularly polarized luminescent material according to claim 1, characterized in that: The spectrum analysis end is used to obtain the fluorescence emission spectra corresponding to the left-handed circularly polarized light and the right-handed circularly polarized light, and calculate the Zeeman splitting energy difference based on the peak wavelengths of the left-handed fluorescence emission spectrum and the right-handed fluorescence emission spectrum.

10. A method for testing the Zeeman effect of a magnetic circularly polarized luminescent material, characterized in that: Applied to the Zeeman effect testing system as claimed in claim 1, the Zeeman effect testing method comprises: The excitation light emitted by the light source module is irradiated onto the magnetic sample stage, and the sample on the magnetic sample stage is excited to emit circularly polarized light; wherein the sample is a magnetic circularly polarized luminescent material; The circularly polarized light is input to the signal test end, and after being adjusted to different polarization directions by the signal test end, fluorescence emission spectra corresponding to left-handed circularly polarized light and right-handed circularly polarized light are obtained; The spectral analysis end obtains the fluorescence emission spectra corresponding to the left-handed circularly polarized light and the right-handed circularly polarized light, and determines the Zeeman effect test result of the sample based on the fluorescence emission spectra corresponding to the left-handed circularly polarized light and the right-handed circularly polarized light.

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