A method for controlling photon spin-orbit coupling in an organic alloy microcavity

Abstract

This invention discloses a method for controlling photon spin-orbit coupling in an organic alloy microcavity, belonging to the field of optical microcavity technology. This invention prepares β-type Pe by doping different amounts of DCA into Pe using a volatilization method. 1‑x DCA x An organic alloy, wherein x ≤ 20 wt%, allows for the controllability of crystal color from yellow-green to orange-red. Furthermore, this organic alloy exhibits birefringence, and its application in the fabrication of optical microcavities allows for the observation of TE-TM spin-orbit coupling and Rashba-Dresselhaus spin-orbit coupling within the microcavities. This provides a novel type of microcavity for studying the interaction between light and matter in organic alloy microcavities, and the controllability of photon spin-orbit coupling within these microcavities can be achieved by adjusting the value of x.

Description

Technical Field

[0001] This invention relates to the field of optical microcavity technology, and in particular to a method for controlling photon spin-orbit coupling in an organic alloy microcavity. Background Technology

[0002] Organic microcavities are made from low-cost raw materials and are easy to fabricate, which facilitates the design and realization of artificially mediated microcavities and has strong applications in the field of nonlinear optics. TE-TM spin-orbit coupling refers to the interaction between the photon spin and orbital in a microcavity, resulting in the splitting of the transverse electric field-transverse magnetic field (TE-TM) and the emergence of a k-dependent effective magnetic field. The manipulation of spin-orbit coupling in organic microcavities is fundamental to the development of nonlinear optics and photonic systems.

[0003] Organic crystals offer advantages such as ease of fabrication and metastable state at room temperature. The birefringence and anisotropy of organic micro / nano crystals play a crucial role in the study of polarized light; their spatial arrangement leading to long-range order and long-range coherence enables low-threshold lasers, valley excitation, and nonlinear topologies. Organic alloys, being single crystals, possess naturally excellent anisotropy and hold broad application prospects in the microcavity field. Developing high-performance organic alloys for microcavities and suitable spin-orbit coupling modulation methods is of great significance. Summary of the Invention

[0004] The purpose of this invention is to provide a method for controlling photon spin-orbit coupling in organic alloy microcavities, thereby solving the problems existing in the prior art. This invention obtains β-type Pe by doping it with DCA. 1-x DCA x Organic alloys were used to prepare organic microcavities. By controlling the amount of DCA doping, the spin-orbit coupling in the organic alloy microcavities could be regulated.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] One of the technical solutions of the present invention: a method for controlling photon spin-orbit coupling in an organic alloy microcavity, comprising the following steps:

[0007] With β-type Pe 1-x DCA x Organic alloy microcavities were prepared by using organic alloys as optoelectronic material layers;

[0008] Through the analysis of β-type Pe 1-x DCA x The value of x in the organic alloy is controlled to regulate the photon spin-orbit coupling in the organic alloy microcavity, where x ≤ 20 wt% (x represents the DCA value in the Pe). 1-xDCA x The mass percentage of the organic alloy, i.e., [mass of DCA / (mass of Pe + mass of DCA)] × 100%.

[0009] Further, x is preferably 0.5 wt%, 1 wt%, 5 wt%, 10 wt%, or 20 wt%.

[0010] Furthermore, the β-type Pe 1-x DCA x Organic alloys have a crystalline structure.

[0011] Furthermore, the β-type Pe 1-x DCA x The organic alloy is obtained by solvent evaporation using perylene (Pe) and 9,10-dicyanane (DCA) as raw materials and dichloromethane and anhydrous ethanol as solvents.

[0012] Furthermore, the volume ratio of dichloromethane to anhydrous ethanol in the solvent is 1:1; the mass / volume ratio of perylene to the solvent is 1 mg: 1 mL.

[0013] Furthermore, the amount of 9,10-dicyananthracene used is 0-20 wt% of the sum of the amounts of perylene and 9,10-dicyananthracene, that is, by mass ratio, (perylene + 9,10-dicyananthracene): 9,10-dicyananthracene = 1:0-0.2.

[0014] Furthermore, the solvent is released at room temperature.

[0015] β-type Pe 1-x DCA x Organic alloys have simple synthesis steps, readily available raw materials, and high cost-effectiveness.

[0016] The second technical solution of the present invention: an organic alloy microcavity, the structure of which includes, from top to bottom:

[0017] Upper silver film, optoelectronic material layer and lower silver film;

[0018] The photoelectric material layer is a β-type Pe 1-x DCA x Organic alloys.

[0019] Furthermore, the upper silver film has a thickness of 50 nm and a reflectivity of 92.5%; the lower silver film has a thickness of 150 nm and a reflectivity of 99.9%; and the photoelectric material layer has a thickness of 0.2-6 μm.

[0020] Furthermore, the thickness of the optoelectronic material layer is preferably 1.7-4.9 μm.

[0021] Furthermore, the substrate is a glass composed of silicon dioxide.

[0022] The third technical solution of the present invention: the preparation method of the above-mentioned organic alloy microcavity includes the following steps:

[0023] A lower silver film is deposited on the substrate, and β-type Pe is grown on the surface of the lower silver film by solvent evaporation. 1-x DCA x An organic alloy is used as the optoelectronic material layer, and a silver film is deposited on the surface of the optoelectronic material layer.

[0024] Furthermore, the deposition rate of the lower silver film is... The evaporation rate of the upper silver film is

[0025] Furthermore, the β-type Pe 1-x DCA x The organic alloy is obtained by solvent evaporation using perylene and 9,10-dicyanane as raw materials and dichloromethane and anhydrous ethanol as solvents.

[0026] Furthermore, the specific operation of the solvent evaporation is as follows: perylene, 9,10-dicyanane and solvent are mixed to obtain a mixed solution; the mixed solution is dropped onto the surface of the lower silver film and evaporates naturally at room temperature.

[0027] Further, the volume ratio of dichloromethane to anhydrous ethanol in the solvent is 1:1; the mass / volume ratio of perylene to solvent is 1 mg: 1 mL; and the amount of 9,10-dicyananthracene used is 0-20 wt% of the sum of the amounts of perylene and 9,10-dicyananthracene.

[0028] This invention involves mixing perylene and 9,10-dicyanane in a solvent, and then incorporating different amounts of the acceptor molecule DCA through a volatilization method at room temperature. During the volatilization process, due to supersaturation crystallization, a series of β-type Pestochemicals are formed. 1-x DCA xOrganic alloy crystals are used to control the photophysical properties of organic alloys and to fabricate optical microcavities. By adjusting the amount of DCA doped, the spin-orbit coupling within the organic alloy microcavity can be controlled. This invention verifies the correctness of the organic alloy synthesis and the design of the organic alloy microcavity using fluorescence spectroscopy, absorption spectroscopy, and X-ray diffraction. Fluorescence spectroscopy tests reveal that the wavelength of the main peak in the emission spectrum differs depending on the amount of DCA doped. For example, the main peak is at 555 nm with 0.5 wt% DCA (x = 0.5 wt%), while it is at 605 nm with 5 wt% DCA (x = 5 wt%). Furthermore, the anisotropy of emission and absorption changes significantly with different amounts of DCA doped. Meanwhile, the energy splitting at a specific wavelength in the microcavity formed by this type of organic alloy changes and is related to its anisotropy. The greater the anisotropy, the greater the intermolecular transition dipole moment, the greater the energy splitting, and the higher the conversion rate of circularly polarized light. The change in its anisotropy indicates the property of a strong transition dipole moment.

[0029] This invention also designed different β-type Pe under the same DCA doping ratio. 1-x DCA x The microcavity of different thicknesses was used to divide spin-orbit coupling into two cases: spin-orbit coupling occurring at the point of generating the first winding and spin-orbit coupling occurring at the point of generating the second winding. It was found that the circularly polarized light conversion efficiency of spin-orbit coupling occurring at the point of generating the first winding was much higher than that of spin-orbit coupling occurring at the point of generating the second winding. This indicates that the electric field distribution is different in microcavities of different thicknesses, which affects the position of the anti-crossing in the electric field and thus affects spin-orbit coupling.

[0030] The β-type Pe prepared by this invention 1-x DCA x Organic alloys exhibit good kinetic stability and are relatively easy to prepare. Furthermore, their birefringence allows for in-depth research into circularly polarized light. Absorption spectroscopy analysis reveals significant variations in the anisotropy of these organic alloys, indicating that incorporating acceptor molecules (DCA) to form organic alloys and subsequently modulating crystal anisotropy and intermolecular transition dipole moments, thereby controlling the TE-TM spin-orbit coupling degree within microcavities, is a highly effective and feasible approach. Moreover, these organic alloy microcavities can be used in quantum information processing and photonic chip systems. In conclusion, these organic alloy microcavities represent promising optical microcavity and optoelectronic materials.

[0031] There are existing technologies regarding α-type Pe 1-x DCA x There are reports on organic alloys, but no reports on β-type Pe. 1-x DCA xReports on organic alloys. The β-type Pe of this invention... 1-x DCA x Organic alloys possess stable kinetic properties, are easier to prepare at room temperature than α-type alloys, and due to their unique molecular spatial structure, allow for the preparation of thicker samples via volatilization, resulting in different photophysical properties. Meanwhile, β-type Pe... 1-x DCA x The description of the design and application of organic alloy microcavities can provide a way of thinking for the development of other alloy microcavities, enabling the continuous expansion of the types and quantities of alloy microcavities, and opening up new horizons for the discovery of new organic material microcavities.

[0032] The present invention discloses the following technical effects:

[0033] This invention prepares β-type Pe by incorporating different amounts of DCA into Pe via a volatilization method. 1-x DCA x An organic alloy has been developed that allows for the control of crystal color from yellow-green to orange-red. Furthermore, this organic alloy exhibits birefringence, and its application in the fabrication of optical microcavities allows for the observation of TE-TM spin-orbit coupling and Rashba-Dresselhaus spin-orbit coupling within the microcavities. This provides a novel type of microcavity for studying the interaction between light and matter in organic alloy microcavities.

[0034] This invention discovers that changes in spin-orbit coupling are related to changes in anisotropy, and that β-type Pe 1-x DCA x The anisotropy of organic alloys is related to the amount of DCA incorporated, leading to the proposal of a method to modify the β-type Pe 1-x DCA x The method of controlling the value of x in organic alloys to regulate the spin-orbit coupling of photons in organic alloy microcavities provides a prerequisite for the regulation of the spin Hall effect and has applications in fields such as optical communication, cold atoms, and quantum information processing. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 The structural formulas are those of perylene and 9,10-dicyanane, where a is perylene and b is 9,10-dicyanane;

[0037] Figure 2 Pe of type β1-x DCA x A schematic diagram of a typical molecular structure of an organic alloy, where a represents the crystal structure of Pe; b and c represent two random cases where DCA replaces the position of Pe, respectively.

[0038] Figure 3 Pe obtained in Examples 1-6 1-x DCA x Fluorescence images of organic alloy products, where a is Example 6, and b to f are Examples 1 to 5 respectively;

[0039] Figure 4 Pe obtained in Examples 1-6 1-x DCA x XRD diffraction patterns of organic alloy products;

[0040] Figure 5 The fluorescence image is shown for the Pe organic single crystal product prepared in Comparative Example 1.

[0041] Figure 6 The XRD diffraction pattern of the Pe organic single crystal product prepared in Comparative Example 1 is shown.

[0042] Figure 7 Pe obtained in Examples 1-6 1-x DCA x TEM images of the organic alloy products, where a is Example 6, and b to f are Examples 1 to 5, respectively;

[0043] Figure 8 Pe obtained in Examples 1-6 1-x DCA x Absorption and emission spectra of organic alloy products;

[0044] Figure 9 Pe obtained in Examples 1-6 1-x DCA x Anisotropy of absorption spectra of organic alloy products, where a is Example 6, and b to f are Examples 1 to 5 respectively;

[0045] Figure 10 Fluorescence image (a) and absorption and emission spectra (b) of the raw material DCA;

[0046] Figure 11 The emission spectrum anisotropy (a) and absorption spectrum anisotropy (b) of the raw material DCA;

[0047] Figure 12 This is a schematic diagram of the structure of an organic alloy microcavity;

[0048] Figure 13The reflectances of the upper and lower layers of the organic alloy microcavity prepared in Example 1 are given, where a is the upper layer and b is the lower layer.

[0049] Figure 14 Pe prepared using Example 1 1-x DCA x Reflectance spectra of organic alloy microcavities with different DCA doping amounts in organic alloy optoelectronic material layers, where a~f represent Pe 1-x DCA x The TE-TM splitting energy of organic alloy microcavities with different DCA doping amounts in the organic alloy optoelectronic material layer at an energy of 2.4 eV, g~l is Pe 1-x DCA x The Stokes parameter S3 of organic alloy microcavities with different DCA doping amounts in the organic alloy optoelectronic material layer at the same energy; the black squares in m represent the splitting values ​​extracted from a to f at 2.4 eV; the blue and red dots in n represent the left-handed (δ) splitting values ​​extracted from g to l at 2.4 eV. + ) and right-handed (δ) + Magnitude of circular polarization;

[0050] Figure 15 Pe obtained using Examples 2-4 1-1wt％ DCA 1wt％ Reflectance spectra of organic alloy microcavities with different thicknesses of organic alloy optoelectronic material layers are shown. In the figure, a–c represent the TE-TM splitting energies of organic alloy microcavities with different optoelectronic material layer thicknesses at 2.5 eV, and d–f represent the Stokes parameters S3 of organic alloy microcavities with different optoelectronic material layer thicknesses at the same energy. The blue and red dots in g represent the left-handed (δ¹⁴) polaritons extracted at 2.4 eV in figures d–f. + ) and right-handed (δ) + Magnitude of circular polarization;

[0051] Figure 16 This is a schematic diagram illustrating the effect of dipole moment on the photon spin-orbit coupling process in a microcavity.

[0052] Figure 17 The reflection spectra of the organic alloy microcavity with the β-type Pe organic single crystal as the optoelectronic material layer in Example 6 and the organic alloy microcavity with the Pe organic single crystal as the optoelectronic material layer in Comparative Example 1 are shown. Here, a and b are the controllable range of the optoelectronic material layer thickness of the microcavity with the β-type Pe organic single crystal as the optoelectronic material layer in Example 6, and c and d are the controllable range of the optoelectronic material layer thickness of the microcavity with the Pe organic single crystal as the optoelectronic material layer in Comparative Example 1. Detailed Implementation

[0053] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0054] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Any stated value or intermediate value within a stated range, as well as each smaller range between any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0055] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0056] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be readily apparent to those skilled in the art. This specification and embodiments are merely exemplary.

[0057] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0058] In the specific embodiments of this invention, "%" refers to a percentage by mass.

[0059] The raw materials and reagents used in the specific embodiments of this invention are all commercially available products.

[0060] Figure 1 The structural formulas of perylene and 9,10-dicyanane used in specific embodiments of the present invention are shown below, where a is perylene and b is 9,10-dicyanane.

[0061] Example 1

[0062] β-type Pe 1-x DCA x Preparation of organic alloys:

[0063] Take 2 mg of perylene powder and 0.01 mg of 9,10-dicyanane and place them in a 5 mL centrifuge tube. Then add 1 mL of dichloromethane and 1 mL of anhydrous ethanol to obtain a mixed solution. Use a pipette to pipette 150 μL of the above mixed solution onto a coverslip and allow it to evaporate naturally at room temperature (25 °C) to obtain β-type Pe. 1-x DCA x An organic alloy crystal, wherein the amount of 9,10-dicyanane is 0.5 wt% of the sum of the amounts of perylene and 9,10-dicyanane (i.e., x is 0.5 wt%).

[0064] Example 2

[0065] Compared to Example 1, the only difference is that the amount of 9,10-dicyananthracene used is 0.02 mg, that is, the amount of 9,10-dicyananthracene used is 1 wt% of the sum of the amounts of perylene and 9,10-dicyananthracene, resulting in β-type Pe 1-x DCA x The x value in the organic alloy crystal is 1 wt%.

[0066] Example 3

[0067] Compared to Example 1, the only difference is that the amount of 9,10-dicyananthracene used is 0.105 mg, which is 5 wt% of the sum of the amounts of perylene and 9,10-dicyananthracene, resulting in β-type Pe 1-x DCA x The x content in the organic alloy crystal is 5 wt%.

[0068] Example 4

[0069] Compared to Example 1, the only difference is that the amount of 9,10-dicyananthracene used is 0.22 mg, which is 10 wt% of the sum of the amounts of perylene and 9,10-dicyananthracene, resulting in β-type Pe 1-x DCA x x in the organic alloy crystal is 10 wt%.

[0070] Example 5

[0071] Compared to Example 1, the only difference is that the amount of 9,10-dicyananthracene used is 0.5 mg, that is, the amount of 9,10-dicyananthracene used is 20 wt% of the sum of the amounts of perylene and 9,10-dicyananthracene, resulting in β-type Pe 1-x DCA x The x content in the organic alloy crystal is 20 wt%.

[0072] Example 6

[0073] The only difference from Example 1 is that the amount of 9,10-dicyanane is 0, and the product obtained is β-type Pe organic single crystal.

[0074] Comparative Example 1

[0075] Take 2 mg of perylene and put it into a 10 mL centrifuge tube. Then add 4 mL of dichloromethane and 4 mL of anhydrous ethanol to obtain a mixed solution. Use a pipette to take 150 μL of the above mixed solution and drop it onto a coverslip. Allow it to evaporate naturally at room temperature of 25 °C to obtain Pe organic single crystals.

[0076] Application Example 1

[0077] Fabrication of organic alloy microcavities:

[0078] Using a glass slide composed of silica as a substrate, the ink is applied on the glass slide... A 150 nm thick silver film was deposited at a certain evaporation rate, forming a dense reflective layer with a reflectivity of approximately 99.9% as the lower layer; Pe as described in Examples 1-6 was then prepared on the surface of the lower silver film. 1-x DCA x An organic alloy was used as the optoelectronic material layer (specifically, the mixed solutions prepared in Examples 1-6 were dropped onto the surface of the lower silver film using a dropper, and allowed to evaporate naturally at room temperature (25°C) to obtain a 3.2 μm thick organic alloy optoelectronic material layer); on the surface of the optoelectronic material layer... A 50 nm thick silver film was deposited at a certain evaporation rate to form a reflective layer with a reflectivity of approximately 92.5% as the upper layer. This resulted in organic alloy microcavities with varying DCA doping levels in the optoelectronic material layers. A schematic diagram of the fabricated organic alloy microcavities is shown below. Figure 12 As shown.

[0079] Application Example 2

[0080] The only difference from Application Example 1 is that the photoelectric material layer is the Pe used in Example 2. 1-1wt％ DCA 1wt％ An organic alloy was used to achieve a photoelectric material layer thickness of 1.7 μm by controlling the amount of mixed solution added.

[0081] Application Example 3

[0082] The only difference from Application Example 1 is that the photoelectric material layer is the Pe used in Example 2. 1-1wt％ DCA 1wt％ An organic alloy was used to achieve a photoelectric material layer thickness of 3.8 μm by controlling the amount of mixed solution added.

[0083] Application Example 4

[0084] The only difference from Application Example 1 is that the photoelectric material layer is the Pe used in Example 2. 1-1wt％ DCA 1wt％An organic alloy, by controlling the amount of mixed solution added, achieves a photoelectric material layer thickness of 4.9 μm.

[0085] Test case

[0086] Figure 2 Pe and β-type Pe 1-x DCA x A schematic diagram of a typical molecular structure of an organic alloy, where a represents the crystal structure of Pe; b and c represent two random cases where DCA replaces the position of Pe.

[0087] Figure 3 Pe obtained in Examples 1-6 1-x DCA x The fluorescence images of the organic alloy products are shown in Figure 6 (a) and Figures 1-5 (b-f). As can be seen from Figures 1-5, the fluorescence color of the product gradually changes from yellow-green to orange-red as the amount of DCA doping (i.e., the value of x) gradually increases. The product is rhomboid (rhomboid is generally the shape of β-type Pe), which proves that under the condition of perylene concentration of 1 mg / mL, the solvent evaporates the crystals and they tend to grow towards the β-type. Figure 4 Pe obtained in Examples 1-6 1-x DCA x The XRD diffraction patterns of the organic alloy products (where 0.5%, 1%, 5%, 10%, and 20% represent the values ​​of x, Pe represents x = 0, and powder represents the theoretically simulated XRD diffraction pattern of a β-type Pe organic single crystal) are derived from... Figure 4 It can be seen that the Pe obtained by incorporating different amounts of DCA in Examples 1-6 1-x DCA x The diffraction peaks of the crystals are consistent, indicating that the different amounts of DCA doping did not change the crystal lattice structure of the alloy, thus confirming that the product is an alloy. Furthermore, the diffraction peak positions of Examples 1-6 are consistent with the theoretically simulated diffraction peaks of β-type Pe organic single crystals, further proving that the Pe prepared in Examples 1-6... 1-x DCA x The organic alloy product is indeed β-type Pe. 1-x DCA x . Figure 5 The fluorescence spectrum of the Pe organic single crystal product prepared in Comparative Example 1 is shown below. Figure 5 It can be seen that the product of Comparative Example 1 is square (a square is generally the shape of α-type Pe), proving that under the condition of perylene concentration of 0.25 mg / mL, the solvent evaporates the crystals and they tend to grow into α-type. Figure 6 The XRD diffraction pattern of the Pe organic single crystal product prepared in Comparative Example 1 is shown below (where 0 represents the Pe organic single crystal prepared in Comparative Example 1, and powder represents the XRD diffraction pattern of the theoretically simulated α-type Pe organic single crystal). Figure 6It can be seen that the diffraction peak positions of Comparative Example 1 are basically consistent with the diffraction peaks of the theoretically simulated α-type Pe organic single crystal, but there is an extra sharp peak at 9°, which further proves that the solvent evaporation crystals of Comparative Example 1 tend to grow towards the α-type under the condition that the perylene concentration is 0.25 mg / mL. However, the α-type crystals may not be pure during the growth process and may be doped with trace amounts of β-type crystals.

[0088] Figure 7 Pe obtained in Examples 1-6 1-x DCA x TEM images of the organic alloy products, where a is Example 6, and b to f are Examples 1 to 5 respectively. Figure 7 It can be seen that the two-dimensional microsheets with tilt angles in Examples 1 to 6 remain almost unchanged, which further illustrates the single crystal composition of their alloys, that is, the products are all pure β-type.

[0089] Figure 8 Pe obtained in Examples 1-6 1-x DCA x The absorption and emission spectra of the organic alloy products (where 0, 0.5%, 1%, 5%, 10%, and 20% represent the values ​​of x) are derived from... Figure 8 It can be seen that with the increase of DCA doping, the main peak of the emission spectrum has a large red shift (>50nm), which reflects the properties of intramolecular transition dipole moment.

[0090] Figure 9 Pe obtained in Examples 1-6 1-x DCA x The anisotropy of the absorption spectrum (measured using visible white light) of the organic alloy product, where a is Example 6, and b to f are Examples 1 to 5 respectively. Figure 9 It can be seen that the anisotropy of crystal absorption is different when different amounts of DCA are added, indicating that the amount of DCA added has a great influence on the anisotropy of crystal absorption. The polarization degrees of x for 0%, 0.5%, 1%, 5%, 10%, and 20% are 0.30, 0.32, 0.37, 0.29, 0.31, and 0.29, respectively.

[0091] Figure 10 Fluorescence photograph (a) and absorption and emission spectra (b) of the raw material DCA, from Figure 10 It can be seen that DCA emits green light, with an absorption peak at 450nm and PL at 540nm.

[0092] Figure 11 The emission and absorption anisotropy of the raw material DCA are given, where a represents the emission anisotropy and b represents the absorption anisotropy. Figure 11It can be seen that the polarization magnitude of the emission spectrum is P = 0.51, and the polarization magnitude of the absorption spectrum is p = 0.40.

[0093] Figure 13 Let a represent the reflectivity of the upper and lower layers of the organic alloy microcavity prepared in Example 1, where a is the upper layer and b is the lower layer. Figure 13 It can be seen that the reflectivity of the upper silver film is about 0.925, or about 92.5%; the reflectivity of the lower silver film is about 0.999, or 99.9%, forming a perfect FP microcavity.

[0094] The microcavity was tested using a self-constructed angle-resolved optical path. The anti-crossing points were tuned to the same energy (wavelength), and the reflection spectrum and corresponding polarization data were measured. Stokes parameters were calculated, and the results are as follows: Figure 14 As shown.

[0095] Figure 14 Pe prepared using Example 1 1-x DCA x Reflectance spectra of organic alloy microcavities with different DCA doping amounts in organic alloy optoelectronic material layers, where a~f represent Pe 1-x DCA x The TE-TM splitting energy of organic alloy microcavities with different DCA doping amounts in the organic alloy optoelectronic material layer at an energy of 2.4 eV (a to f represent x of 0, 0.5 wt%, 1 wt%, 5 wt%, 10 wt%, and 20 wt%, respectively), g to l represent PeDCA. x The Stokes parameter S3 at the same energy for organic alloy microcavities with different DCA doping amounts in the organic alloy optoelectronic material layer (g~l represent x as 0, 0.5wt%, 1wt%, 5wt%, 10wt%, and 20wt%, respectively); the black squares in m represent the splitting values ​​extracted at 2.4 eV from a to f, respectively, and the blue and red dots in n represent the left-handed (δ) splitting values ​​extracted at 2.4 eV from g to l, respectively. + (blue) and right-handed (δ) + (Red) Degree of circular polarization. From Figure 14 It can be seen that, with Pe 1- x DCA x As the DCA doping amount (i.e., the value of x) in the organic alloy increases, the TE-TM splitting energy differs at the same energy level. The Stokes parameter S3 component changes with the splitting energy, indicating different conversion rates of circularly polarized light. This suggests that the total dipole moment of the molecule after DCA doping affects the molecular anisotropy, thus influencing the splitting energy and the conversion rate of circularly polarized light (i.e., the dipole moment affects the photon spin-orbit coupling in the microcavity). Figure 16 (A schematic diagram illustrating the effect of dipole moment on the photon spin-orbit coupling process in a microcavity).

[0096] Figure 15 Pe obtained using Examples 2-4 1-1wt％ DCA 1wt％ Reflectance spectra of organic alloy microcavities with different thicknesses of organic alloy optoelectronic material layers, where a to c are the TE-TM splitting energies of organic alloy microcavities with different optoelectronic material layer thicknesses at 2.5 eV (a to c represent application examples 2 to 4, respectively), d to f are the Stokes parameters S3 of organic alloy microcavities with different optoelectronic material layer thicknesses at the same energy (d to f represent application examples 2 to 4, respectively); the blue and red dots in g are the left-handed (δ-coil) spectra extracted at 2.4 eV in d to f, respectively. + (blue) and right-handed (δ) + (Red) Degree of circular polarization. From Figure 15 It can be seen that spin-orbit coupling occurs at the point of the first winding in Application Examples 2 and 3, and at the point of the second winding in Application Example 4. The circular polarization conversion rate is much higher when spin-orbit coupling occurs at the point of the first winding than when it occurs at the point of the second winding. That is, the number of windings affects the photon spin-orbit coupling in the microcavity.

[0097] Figure 17 The reflection spectra of the organic alloy microcavities using the β-type Pe organic single crystal as the photoelectric material layer in Example 6 and the organic alloy microcavities using the Pe organic single crystal as the photoelectric material layer in Comparative Example 1 (the microcavities were prepared using the same method as in Application Example 1, but different photoelectric material layer thicknesses were obtained by controlling the amount of mixed solution added) are shown. A and b show the range of adjustable photoelectric material layer thickness for the microcavity using the β-type Pe organic single crystal as the photoelectric material layer in Example 6, and c and d show the range of adjustable photoelectric material layer thickness for the microcavity using the Pe organic single crystal as the photoelectric material layer in Comparative Example 1. Figure 17 It can be seen that, within the same energy range of 2.6 to 2.4 eV, the number of modes of the microcavity with the β-type Pe organic single crystal as the optoelectronic material layer in Example 6 can be adjusted from one to three, while the microcavity with the Pe organic single crystal as the optoelectronic material layer in Comparative Example 1 can only be adjusted to about one mode. (In optical microcavities, the number of optical modes can be used to preliminarily represent the thickness of the microcavity: the more modes a microcavity has, the thicker the optoelectronic material layer is, and the fewer modes a microcavity has, the thinner the optoelectronic material layer is. The thicknesses of the optoelectronic material layers of the microcavities in a, b, c, and d are 1.7 μm, 4.9 μm, 1.1 μm, and 1.6 μm, respectively.)

[0098] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for controlling photon spin-orbit coupling in an organic alloy microcavity, characterized by the following steps: include: With β-type Pe 1-x DCA x Organic alloy microcavities were prepared by using organic alloys as optoelectronic material layers; Through the analysis of β-type Pe 1-x DCA x The value of x in the organic alloy is controlled to regulate the photon spin-orbit coupling in the organic alloy microcavity, where x ≤ 20 wt%; The β-type Pe 1-x DCA x The organic alloy is obtained by solvent evaporation using perylene and 9,10-dicyanane as raw materials and dichloromethane and anhydrous ethanol as solvents. The volume ratio of dichloromethane to anhydrous ethanol in the solvent is 1:1; the mass / volume ratio of perylene to solvent is 1 mg: 1 mL.

2. The control method as described in claim 1, characterized in that, The solvent evaporation is carried out at room temperature.

3. An organic alloy microcavity, characterized in that, The structure, from top to bottom, includes: Upper silver film, optoelectronic material layer and lower silver film; The photoelectric material layer is a β-type Pe 1-x DCA x Organic alloy, wherein x ≤ 20 wt%; The β-type Pe 1-x DCA x The organic alloy is obtained by solvent evaporation using perylene and 9,10-dicyanane as raw materials and dichloromethane and anhydrous ethanol as solvents. The volume ratio of dichloromethane to anhydrous ethanol in the solvent is 1:1; the mass / volume ratio of perylene to the solvent is 1 mg: 1 mL; The thickness of the photoelectric material layer is 0.2-6 μm.

4. The organic alloy microcavity as described in claim 3, characterized in that, The upper silver film has a thickness of 50 nm and a reflectivity of 92.5%; the lower silver film has a thickness of 150 nm and a reflectivity of 99.9%.

5. The method for preparing organic alloy microcavities according to any one of claims 3-4, characterized in that, step include: A lower silver film is deposited on the substrate, and β-type Pe is grown on the surface of the lower silver film by solvent evaporation. 1-x DCA x An organic alloy is used as a photoelectric material layer, and a silver film is deposited on the surface of the photoelectric material layer. The deposition rate of the lower silver film is 1 nm / Å, and the deposition rate of the upper silver film is 0.2 nm / Å.

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