CN113589411A - Plasma microcavity based on noble metal nanoparticle-J-polymer dye and preparation method thereof - Google Patents

Abstract

Translated fromChinese

本发明涉及一种基于贵金属纳米颗粒‑J聚体染料等离子体微腔，包括银纳米膜、J聚体染料间隙层、以及分布于J聚体染料间隙层上的贵金属纳米颗粒。制备方法，将J聚体染料粉末溶于溶剂中，制得的J聚体染料溶液；采用电子束蒸发镀膜法在干净的硅片上镀上一层Ti/Ag薄膜；将J聚体染料溶液滴涂至银纳米膜上，采用旋涂法制备J聚体染料间隙层；将贵金属纳米颗粒溶液滴涂在PDMS上，轻轻按压，揭下PDMS，得到贵金属纳米颗粒‑J聚体染料等离子体微腔。有益效果是：成本得以有效降低，反应条件温和，后期处理简单，大大降低了运行成本。The invention relates to a plasma microcavity based on noble metal nanoparticles-J-mer dye, comprising a silver nano-film, a J-mer dye gap layer, and noble metal nanoparticles distributed on the J-mer dye gap layer. The preparation method comprises the following steps: dissolving J-polymer dye powder in a solvent to prepare a J-polymer dye solution; using electron beam evaporation coating method to coat a layer of Ti/Ag film on a clean silicon wafer; dissolving the J-polymer dye solution Drop-coated on the silver nanofilm, and prepared the J-polymer dye interstitial layer by spin coating; drop-coated the noble metal nanoparticle solution on the PDMS, gently pressed, and peeled off the PDMS to obtain the noble metal nanoparticle-J-polymer dye plasma microcavity. The beneficial effects are: the cost is effectively reduced, the reaction conditions are mild, the post-processing is simple, and the operation cost is greatly reduced.

Description

Plasma microcavity based on noble metal nanoparticle-J-polymer dye and preparation method thereof

Technical Field

The invention relates to the technical field of plasma microcavity structures, in particular to a noble metal nanoparticle-J-polymer dye-based plasma microcavity and a preparation method thereof.

Background

In recent years, the interaction of light with a substance has been one of the core problems of research in the optical field, and excitons play an important role in the optical properties of organic molecules and semiconductor materials at the micro-nano scale. Since excitons are much smaller in scale than the wavelength of light, the interaction of light with excitons is greatly hindered in application; surface plasmons (SPPs) are Surface local electromagnetic wave patterns generated by collective oscillation of metal Surface electrons, can effectively break through diffraction limit, have extremely strong near-field enhancement effect, and provide possibility for realizing light regulation and control under nanoscale.

The interaction between the surface plasmon mode generated in the microcavity structure and the excitons around the microcavity structure can be classified into a strong coupling condition and a weak coupling condition according to whether the nearby wave function is disturbed or not. The weak coupling does not disturb the wave functions of the interaction, and the strong coupling disturbs the wave functions of the interaction, so that a new concept of 'strong coupling state' is generated, which is mainly characterized in that surface plasmons and molecules are coupled to form a new hybrid state, energy is subjected to resonance exchange between an upper energy level and a lower energy level of the new hybrid state, namely, Rabi oscillation is generated, and Rabi splitting occurs on the response spectrum of the new hybrid state.

Based on the semi-optical and semi-material characteristics exhibited by the plasmon exciton microcavity structure, people limit photons on the surface of the metal nanoparticles, compress the distribution of a spatial electromagnetic field, and realize the regulation and control of the coupling strength between the plasmon and the exciton by regulating and controlling the conditions such as the size, the concentration and the distance between interaction of exciton materials, and the like, thereby providing possibility for the development of an optical modulator under the nanoscale.

Based on the application values, many groups are dedicated to research on the construction of the noble metal nanoparticle-J-polymer dye plasma microcavity structure in recent years. The subject group, which utilizes gold core-silver shell nanowires and two different J-mer dyes integrated into a single hybrid structure (The joural of physical chemistry letters,2019,10:6137), observed extremely strong plasmon coupling and bimodal Rabi cleavage up to 338meV (175meV and 163meV), but The choice of 2 dyes also increased The later cost. Also subject was the construction of a monolayer WS separated by silver nanoprisms and by J-mer dyes₂Composite system (Optic Express,2019,27:16613) for realizing WS in hybrid micro-nano structure₂A strong coupling process between excitons, J-mer dye excitons and localized surface plasmon resonances, a bimodal Rabi cleave at 300meV (130meV and 170meV) was observed. They are adjusted by adjusting the temperature and the concentration of the J-merThe strong coupling is regulated and controlled, but the whole process is only obtained through software simulation and is not supported by experiments.

Therefore, the novel surface plasma microcavity structure which is single in material, simple and convenient in preparation process and high in coupling strength is significant in construction.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a plasma microcavity based on noble metal nanoparticles and J-polymer dye and a preparation method thereof, so as to overcome the defects in the prior art.

The technical scheme for solving the technical problems is as follows: a plasma microcavity based on noble metal nanoparticles and J-polymer dye comprises a silver nano-film, a J-polymer dye gap layer and noble metal nanoparticles distributed on the J-polymer dye gap layer.

On the basis of the technical scheme, the invention can be further improved as follows.

As an improvement of the technical scheme, the noble metal nano-particles are gold or silver, and the particle size range of the noble metal nano-particles is 50nm-150 nm.

Still further, the noble metal nanoparticles are silver.

Further, the noble metal nanoparticles have a particle size of 50nm, 70nm, 90nm, 110nm, 130nm, or 150 nm.

As an improvement of the technical scheme, the silver nano film is a Ti/Ag film prepared by adopting an electron beam evaporation method, wherein the size ratio of Ti to Ag is 1: 6-1: 10, because the Ti material has activity, Ag is more easily attached to the surface of the Ti material in the film plating process, and the smoothness and stability of the film are ensured.

Further, the size ratio of Ti and Ag is 1: 7.5, i.e., 10nm Ti, 75nm Ag film was evaporated.

As an improvement of the technical scheme, the J-mer dye in the J-mer dye gap layer is a special dye molecule aggregate, the resonance excitation can be realized at room temperature due to the extremely high oscillator strength, and the J-mer dye is preferably methylene blue dye, because the methylene blue can be in the coexistence of monomer and dimer in a certain concentration range, and the strong coupling based on the noble metal nanoparticle-J-mer dye plasma microcavity is possible.

A preparation method of a noble metal nanoparticle-J-mer dye-based plasma microcavity comprises the following steps:

s01 preparation of J-Polymer dye solution

Dissolving J-polymer dye powder in a solvent to prepare a J-polymer dye solution;

s02 preparation of silver nano-film

Plating a Ti/Ag film on a clean silicon wafer by adopting an electron beam evaporation coating method, wherein the Ti is used as a transition layer to enable the metal film to be combined with the Si substrate more tightly;

s03 preparation of J-polymer dye gap layer

Dripping the J-polymer dye solution on the silver nano-film, and preparing a J-polymer dye gap layer by adopting a spin-coating method;

s04, preparing noble metal nanoparticle-J-polymer dye plasma micro-cavity

And (3) dripping the noble metal nanoparticle solution on PDMS, standing for 8-15 min, adhering the PDMS with the noble metal nanoparticles and the J-polymer dye gap layer, slightly pressing, and after 1-5 min, removing the PDMS, so that the noble metal nanoparticles are distributed on the J-polymer dye gap layer, thereby obtaining the noble metal nanoparticle-J-polymer dye plasma microcavity.

As an improvement of the above technical scheme, the molar concentration of the J-mer aqueous solution is 1.5X 10-6-1.5X 10-1 mol/L.

Further, the solvent is deionized water.

As an improvement of the technical proposal, the vacuum degree is less than or equal to 10 during film coating^-3Pa, the evaporation rate is 1A/s-5A/s.

Further, the specific method for preparing the silver nano film comprises the following steps: fixing the silicon wafer in a sample disc of a film coating machine by using high-temperature glue, and putting the silicon wafer into a cavity. The required vacuum degree during film coating is not higher than 10^-3Pa, evaporation rate of 1-5A/s to ensure the smoothness of silver surface, and rotation speed of 3-7 rpm.

Further, the evaporation rate is preferably 1A/s; the sample pan rotation speed is preferably 3 rpm.

As the improvement of the technical proposal, the spin-coating rotating speed is 500rpm-3500rpm, and the spin-coating time is 10-90 s.

Further, the spin coating is divided into two stages, wherein the spin coating speed in the first stage is 750rpm low speed for 20s, and the spin coating speed in the second stage is 2000rpm high speed for 50 s.

As an improvement of the technical scheme, the noble metal silver nano-particles are obtained by taking ethanol as a dispersing agent, preparing silver nano-particle assembly dispersion liquid with the mass fraction of 0.01mg/mL-10mg/mL, stirring and uniformly mixing by ultrasonic.

Furthermore, the preparation mass fraction is 0.01 mg/mL.

As an improvement of the above technical solution, in order to prevent ethanol in the noble metal nanoparticle solution from damaging the J-mer dye gap layer, Polydimethylsiloxane (PDMS) is selected to transfer the noble metal nanoparticles in the ethanol.

The invention has the beneficial effects that:

1. the preparation method of the plasma microcavity is simple;

2. according to the invention, the double-mode Rabi splitting (178meV and 171meV) of 349meV is realized by using only one J-polymer dye, and compared with the double-mode Rabi splitting realized by using multiple dyes, the cost is effectively reduced;

3. the invention selects ethanol and deionized water as the solvent, does not contain organic solvent, has mild reaction condition and simple post treatment, and greatly reduces the operation cost.

Drawings

FIG. 1 is a graph of normalized absorption spectra of J-mer dyes at various concentrations;

FIG. 2 is a scattering spectrogram of noble metal nanoparticles of different sizes;

FIG. 3 is a plot of exciton dispersion versus detuning for a high energy branch, an intermediate energy branch, and a low energy branch;

fig. 4 is a schematic of the monomer and dimer excitons of a J-mer dye generating 3 hybridized multiple exciton states and bimodal Rabi cleavage.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.

The invention is based on the construction of a noble metal nanoparticle-J-mer dye plasma microcavity, which comprises a silver nano-film, a J-mer dye interstitial layer and noble metal nanoparticles distributed on the J-mer dye interstitial layer; wherein the molar concentration of the J-mer dye solution is 1.5X 10^-6-1.5×10^-1mol/L。

The preparation process of the plasma microcavity based on the noble metal silver nanoparticle-J polymer dye is convenient, the microcavity structure can realize 349meV dual-mode Rabi splitting (178meV and 171meV), the invention lays a research foundation for the development of a high-grade hybrid system and the research of the interaction between a plurality of emitters mediated by local plasmons of different metal nanostructures in the field of quantum electrodynamics, and provides potential guidance for the development of an integrated optical device.

The preparation process comprises the following steps:

1) preparation of J-mer dye solutions

Dissolving J-polymer dye powder in solvent to obtain the product with molar concentration of 1.5 × 10^-6-1.5×10^-1A J-polymer dye solution of mol/L;

2) preparation of noble Metal Nanomembranes

And (3) plating a Ti/noble metal film on a clean silicon wafer by adopting an electron beam evaporation coating method, wherein the thickness of Ti is 10nm, and the thickness of the noble metal nano film is 75 nm.

Wherein the noble metal is silver, gold or platinum.

3) Preparation of J-mer dye gap layer

Dripping a J-polymer solution with a certain concentration on the silver nano-film, and preparing a J-polymer dye gap layer by adopting a spin-coating method;

4) preparation of noble metal nanoparticle-J-mer dye plasma microcavity

And (2) dropwise coating a certain amount of precious metal nanoparticle solution on Polydimethylsiloxane (PDMS), standing for 8-15 min to ensure that the PDMS with the precious metal nanoparticles is fully adhered to the J-polymer dye gap layer, pressing for 1-5 min, then removing the PDMS, and distributing the precious metal nanoparticles on the J-polymer dye gap layer to obtain the novel precious metal nanoparticle-J-polymer dye plasma microcavity.

Wherein, the noble metal nano-particles are silver or gold, and the J-polymer dye is methylene blue dye.

In the following examples, the preparation and characterization of the novel plasmonic microcavity of the noble metal nanoparticle-J-mer dye of the present invention is described in detail.

The J-mer dyes described in the examples are supplied by IyKa technologies, Inc. of Beijing. During the examination, dark-field scattering spectra in the examples were measured with an optical microscope (BX 53, Olympus) equipped with a 100W halogen lamp; the scattered light is collected by a CCD (Qiamaging, QICAM B series) or spectrometer (Princeton Instruments Acton 2500 i).

Preparing a noble metal nanoparticle membrane: the noble metal nano-particle film covering layer is obtained by adopting an electron beam evaporation method in the prior art. Wherein the noble metal is silver, gold or platinum. Further preferably, the noble metal is silver.

Preparation of methylene blue J-mer dye solution: dissolving 1.6g of methylene blue solid powder in 5mL of deionized water to obtain a methylene blue J-polymer dye stock solution with the concentration of 1mol/L, and diluting the methylene blue dye stock solution with the deionized water to obtain the methylene blue with the concentration of 1.5 multiplied by 10^-6mol/L，2.5×10^-3mol/L，1.25×10^-2mol/L，1.5×10^-2mol/L，2.5×10^-2mol/L and 1.5X 10^-1mol/L。

And spin-coating J-polymer dye solutions with different concentrations onto the silver nanoparticle film to form the J-polymer dye gap layer.

Preparing noble metal silver nanoparticles: and (3) taking ethanol as a dispersing agent, preparing silver nanoparticle assembly dispersion liquid with the mass fraction of 0.01mg/mL, stirring, and ultrasonically mixing uniformly.

And (2) dripping 0.01mg/mL noble metal nanoparticle solution on Polydimethylsiloxane (PDMS), standing for 10 minutes to ensure that the PDMS with the noble metal nanoparticles is fully adhered to the J-polymer dye gap layer, pressing for 3 minutes, then removing the PDMS, and distributing the noble metal nanoparticles on the J-polymer dye gap layer to obtain the novel noble metal nanoparticle-J-polymer dye plasma microcavity.

Referring to fig. 1, it can be seen that: at all concentrations, the J-mer dye exhibited 2 distinct absorption peaks at 610nm and 662nm, corresponding to the dimeric and monomeric absorption intensities of the J-mer dye, respectively. It can be seen that the corresponding absorption intensity of the dimer increases stepwise with increasing concentration of the J-mer dye, indicating that the amount of dimer compared to monomer increases with increasing concentration. When the J-mer concentration is 1.5X 10^-4At mol/L, it can be clearly seen that a shoulder shape appears at 650nm, which is due to the increased dimer.

Example 1

A novel noble metal nanoparticle-J-mer dye plasma microcavity comprises a silver nanofilm, a J-mer dye gap layer and noble metal nanoparticles distributed on the J-mer dye gap layer.

Taking a certain amount of the extract with the concentration of 1.5 multiplied by 10^-6mol/L J-mer methylene blue dye, and spin coating in two stages, wherein the spin coating speed in the first stage is 750rpm low speed for 20s, and the spin coating speed in the second stage is 2000rpm high speed for 50s to form a J-mer dye gap layer'

Taking a certain amount of 0.01mg/mL silver nanoparticle solution, dropwise coating the silver nanoparticle solution on Polydimethylsiloxane (PDMS), standing for 10 minutes to ensure that the PDMS with the silver nanoparticles is fully adhered to the J-polymer dye gap layer, pressing for 3 minutes, then removing the PDMS, and distributing the noble metal nanoparticles on the J-polymer dye gap layer to obtain the novel silver nanoparticle-J-polymer dye plasma microcavity.

Example 2

A novel noble metal nanoparticle-J-mer dye plasma microcavity comprises a silver nanofilm, a J-mer dye gap layer and noble metal nanoparticles distributed on the J-mer dye gap layer.

Taking a certain amount of the extract with the concentration of 2.5 multiplied by 10^-3mol/L J-mer methylene blue dyePerforming spin coating in two stages, wherein the spin coating speed in the first stage is 750rpm low rotation speed and lasts for 20s, and the spin coating speed in the second stage is 2000rpm high rotation speed and lasts for 50s, so that a J-polymer dye gap layer is formed;

taking a certain amount of 0.01mg/mL silver nanoparticle solution, dropwise coating the silver nanoparticle solution on Polydimethylsiloxane (PDMS), standing for 10 minutes to ensure that the PDMS with the silver nanoparticles is fully adhered to the J-polymer dye gap layer, pressing for 3 minutes, then removing the PDMS, and distributing the noble metal nanoparticles on the J-polymer dye gap layer to obtain the novel silver nanoparticle-J-polymer dye plasma microcavity.

Example 3

A novel noble metal nanoparticle-J-mer dye plasma microcavity comprises a silver nanofilm, a J-mer dye gap layer and noble metal nanoparticles distributed on the J-mer dye gap layer.

Taking a certain amount of the extract with the concentration of 1.25 multiplied by 10^-2Carrying out spin coating on a J-polymer methylene blue dye in mol/L in two stages, wherein the spin coating speed in the first stage is 750rpm low rotation speed and lasts for 20s, and the spin coating speed in the second stage is 2000rpm high rotation speed and lasts for 50s to form a J-polymer dye gap layer;

taking a certain amount of 0.01mg/mL silver nanoparticle solution, dropwise coating the silver nanoparticle solution on Polydimethylsiloxane (PDMS), standing for 10 minutes to ensure that the PDMS with the silver nanoparticles is fully adhered to the J-polymer dye gap layer, pressing for 3 minutes, then removing the PDMS, and distributing the noble metal nanoparticles on the J-polymer dye gap layer to obtain the novel silver nanoparticle-J-polymer dye plasma microcavity.

Example 4

A novel noble metal nanoparticle-J-mer dye plasma microcavity comprises a silver nanofilm, a J-mer dye gap layer and noble metal nanoparticles distributed on the J-mer dye gap layer.

Taking a certain amount of the extract with the concentration of 1.5 multiplied by 10^-2Carrying out spin coating on a J-polymer methylene blue dye in mol/L in two stages, wherein the spin coating speed in the first stage is 750rpm low rotation speed and lasts for 20s, and the spin coating speed in the second stage is 2000rpm high rotation speed and lasts for 50s to form a J-polymer dye gap layer;

taking a certain amount of 0.01mg/mL silver nanoparticle solution, dropwise coating the silver nanoparticle solution on Polydimethylsiloxane (PDMS), standing for 10 minutes to ensure that the PDMS with the silver nanoparticles is fully adhered to the J-polymer dye gap layer, pressing for 3 minutes, then removing the PDMS, and distributing the noble metal nanoparticles on the J-polymer dye gap layer to obtain the novel silver nanoparticle-J-polymer dye plasma microcavity.

Example 5

A novel noble metal nanoparticle-J-mer dye plasma microcavity comprises a silver nanofilm, a J-mer dye gap layer and noble metal nanoparticles distributed on the J-mer dye gap layer.

Taking a certain amount of the extract with the concentration of 2.5 multiplied by 10^-2Carrying out spin coating on a J-polymer methylene blue dye in mol/L in two stages, wherein the spin coating speed in the first stage is 750rpm low rotation speed and lasts for 20s, and the spin coating speed in the second stage is 2000rpm high rotation speed and lasts for 50s to form a J-polymer dye gap layer;

taking a certain amount of 0.01mg/mL silver nanoparticle solution, dropwise coating the silver nanoparticle solution on Polydimethylsiloxane (PDMS), standing for 10 minutes to ensure that the PDMS with the silver nanoparticles is fully adhered to the J-polymer dye gap layer, pressing for 3 minutes, then removing the PDMS, and distributing the noble metal nanoparticles on the J-polymer dye gap layer to obtain the novel silver nanoparticle-J-polymer dye plasma microcavity.

Example 6

A novel noble metal nanoparticle-J-mer dye plasma microcavity comprises a silver nanofilm, a J-mer dye gap layer and noble metal nanoparticles distributed on the J-mer dye gap layer.

Taking a certain amount of the extract with the concentration of 1.5 multiplied by 10^-1Carrying out spin coating on a J-polymer methylene blue dye in mol/L in two stages, wherein the spin coating speed in the first stage is 750rpm low rotation speed and lasts for 20s, and the spin coating speed in the second stage is 2000rpm high rotation speed and lasts for 50s to form a J-polymer dye gap layer;

taking a certain amount of 0.01mg/mL silver nanoparticle solution, dropwise coating the silver nanoparticle solution on Polydimethylsiloxane (PDMS), standing for 10 minutes to ensure that the PDMS with the silver nanoparticles is fully adhered to the J-polymer dye gap layer, pressing for 3 minutes, then removing the PDMS, and distributing the noble metal nanoparticles on the J-polymer dye gap layer to obtain the novel silver nanoparticle-J-polymer dye plasma microcavity.

In data testing, the novel plasmonic microcavities of the noble metal nanoparticle-J-mer dyes described in examples 1-6 were observed with an optical microscope (BX 53, Olympus), as shown with reference to fig. 2. It can be seen that the concentration does not exceed 1.25X 10^-2At mol/L, only a single Rabi cleavage peak can be observed at 670 nm; as the J-mer dye concentration continued to increase, the generation of double Rabi cleavage was clearly seen, i.e., a scattering peak was observed at 610nm in addition to the peak near 670 nm.

In a further test, the scattering spectra of silver nanoparticles of example 5 of different sizes (65-95nm) were selected under conditions that ensure constant thickness of the J-mer dye gap layer, as shown in FIG. 3. It can be seen that all normalized spectra show three peaks and two troughs at the exciton resonance. Wherein the peak near 610nm corresponds to exciton resonance of J-mer dye dimer, and the peak near 680nm corresponds to absorption peak of J-mer dye monomer (when aqueous solution is spin-coated into thin film, absorption peak of J-mer dye monomer is red-shifted).

In fig. 4, the traces of all peaks exhibit an anti-cross curve at zero detuning, comprising high-energy branches, medium-energy branches and low-energy branches, and this anti-cross model structure is a typical feature for multimode strong coupling between excitons and plasmons. The curves 1 to 3 are fitting curves of the corresponding high-level branch, the middle-level branch and the low-level branch, respectively, and dots near the curves represent data of the corresponding points extracted in example 5, respectively, and it can be seen that the fitting result of the inverse cross curve substantially matches the experimental data. According to The methods provided by The literature (The journel of physical chemistry C,2017,121:25455) and (Opto-Electronic Advances,2019,2:190008), The double Rabi cleavage value of The novel plasma microcavity of The noble metal nanoparticle-J-mer dye obtained by fitting is 349meV (178meV and 171meV), and The method has important significance for The development of micro-nano integrated devices.

The raw materials listed in the invention, the upper and lower limits and interval values of the raw materials of the invention, and the upper and lower limits and interval values of the process parameters (such as temperature, time and the like) can all realize the invention, and the examples are not listed.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (10)

1. The plasma microcavity based on the noble metal nanoparticles and the J-polymer dye is characterized by comprising a silver nano film, a J-polymer dye gap layer and noble metal nanoparticles distributed on the J-polymer dye gap layer.

2. The microcavity of claim 1, wherein the noble metal nanoparticles are gold or silver, and the noble metal nanoparticles have a size in the range of 50nm to 150 nm.

3. The noble metal nanoparticle-J-mer dye-based plasma microcavity of claim 1, wherein the silver nanomembrane is a Ti/Ag film prepared by electron beam evaporation, wherein the size ratio of Ti to Ag is 1: 6-1: 10.

4. the precious metal nanoparticle-J-mer dye-based plasmonic microcavity of claim 1, wherein the J-mer dye in the J-mer dye gap layer is a methylene blue dye.

5. A method for preparing the plasma microcavity based on noble metal nanoparticles and J-mer dye according to any one of claims 1 to 4, comprising the following steps:

s01 preparation of J-Polymer dye solution

Dissolving J-polymer dye powder in a solvent to prepare a J-polymer dye solution;

s02 preparation of silver nano-film

Plating a Ti/Ag film on a clean silicon wafer by adopting an electron beam evaporation coating method;

s03 preparation of J-polymer dye gap layer

Dripping the J-polymer dye solution on the silver nano-film, and preparing a J-polymer dye gap layer by adopting a spin-coating method;

s04, preparing noble metal nanoparticle-J-polymer dye plasma micro-cavity

And (3) dripping the noble metal nanoparticle solution on PDMS, standing for 8-15 min, adhering the PDMS with the noble metal nanoparticles and the J-polymer dye gap layer, slightly pressing, and after 1-5 min, removing the PDMS, so that the noble metal nanoparticles are distributed on the J-polymer dye gap layer, thereby obtaining the noble metal nanoparticle-J-polymer dye plasma microcavity.

6. The method according to claim 5, wherein a degree of vacuum is 10 or less at the time of coating^-3Pa, the evaporation rate is 1A/s-5A/s.

7. The process according to claim 5, wherein the molar concentration of the aqueous solution of the J-mer is 1.5X 10^-6-1.5×10^-1mol/L。

8. The method according to claim 5, wherein the spin speed is 500rpm to 3500rpm, and the spin time is 10 to 90 seconds.

9. The method of claim 8, wherein the spin coating is divided into two stages, wherein the spin coating speed in the first stage is 750rpm low for 20s and the spin coating speed in the second stage is 2000rpm high for 50 s.

10. The preparation method of claim 5, wherein the noble metal silver nanoparticles are obtained by using ethanol as a dispersing agent, preparing a silver nanoparticle assembly dispersion liquid with a mass fraction of 0.01mg/mL-10mg/mL, stirring, and ultrasonically mixing uniformly.

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