A wavelength real-time adjustable nanolaser light source and a wavelength tuning method
By controlling the displacement of magnetic-plasma core-shell nanoparticles using an external magnetic field coil group, the accuracy and sensitivity issues of real-time wavelength tuning for SPASER have been resolved, achieving non-contact and efficient control, which is applicable to fields such as bioanalysis and optical communication.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHAANXI UNIV OF SCI & TECH
- Filing Date
- 2023-01-10
- Publication Date
- 2026-06-05
AI Technical Summary
Existing technologies cannot achieve real-time high-precision and high-sensitivity tuning of SPASER wavelengths. Mechanical stretching methods lead to structural damage and material lifespan degradation, as well as reduced wavelength tuning accuracy and sensitivity.
The displacement of magnetic-plasma core-shell nanoparticles in liquid gain material is controlled by an external magnetic field coil group, thereby changing the gap distance between the particles and the metal film and realizing non-contact control of the wavelength of the plasma laser.
It achieves real-time tunability of the SPASER wavelength, has long lifespan, high sensitivity and accuracy, and is unaffected by external environment, making it suitable for integrated chip applications.
Smart Images
Figure CN116826498B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of plasma nanolaser technology, specifically to a nanolaser source with real-time tunable wavelength and a wavelength tuning method. Background Technology
[0002] Surface plasmon amplification by stimulated emission of radiation (SPASER) lasers, capable of breaking the diffraction limit, are nanoscale laser sources. They can be realized by exciting surface plasmon polariton (SPP) modes on thin metal films or localized surface plasmon (LSP) modes in metal nanoparticles. Wavelength-tunable SPASERs hold immense promise for on-chip applications in micro / nano displays, biomedicine, sensing and imaging, and optical communication.
[0003] Generally, the SPASER wavelength can be tuned by changing the plasma cavity structure parameters and gain materials. For example, Meng et al. achieved SPASER wavelength tuning in the 562nm-627nm range in a plasma laser structure composed of mesoporous silicon-coated gold nanorods and organic dyes by changing the doping ratio of the laser dye. Huang et al. achieved SPASER wavelength tuning in the 865nm-1001nm range in a square lattice gold nanopillar array structure on top of a gallium arsenide substrate / lnGaAs / GaAs quantum well by changing the lattice period. However, many current methods for achieving SPASER wavelength tuning are based on fixed plasma cavity structures or changes in gain materials. Such fixed plasma structures make it difficult to achieve real-time tuning of the SPASER wavelength, which excludes the possibility of dynamic real-time tuning of the SPASER wavelength and limits the further development and application of nanolasers.
[0004] Currently, the main method to achieve real-time tuning of SPASER wavelength is to mechanically stretch a flexible substrate, change the spacing of the metal nanoparticle array deposited on the flexible substrate, thereby affecting the plasma properties and achieving tunable laser emission of 860nm-920nm. However, repeated mechanical stretching of the substrate will cause structural damage and material lifetime decay; and the instability of the material during shrinkage will affect the degree of wavelength tuning shift; at the same time, repeated mechanical stretching and releasing of the substrate will reduce the accuracy and sensitivity of wavelength tuning (literature information: DQWang et al.,Stretchable Nanolasing from HybridQuadrupole Plasmons,Nano letters.2018,18(7):4549-4555).
[0005] Therefore, it is essential to develop a high-precision and sensitive non-contact real-time tuning method for SPASER wavelengths. Summary of the Invention
[0006] To overcome the shortcomings of the prior art, this invention provides a non-contact, real-time tunable SPASER nanolaser source and a wavelength tuning method. By controlling the displacement of magnetic-plasma core-shell nanoparticles in a liquid gain material through a magnetic field generated by an external coil, the gap distance between the particles and the metal thin film is adjusted, thereby changing the plasma resonance wavelength of the particle-film composite structure and thus controlling the SPASER wavelength in real time. Further changes in particle size, type, and gain medium enable real-time control of the SPASER wavelength in the full visible and near-infrared regions, thus constructing a plasma laser with advantages such as non-contact control, long lifespan, high sensitivity and precision, and real-time wavelength tuning.
[0007] To achieve the above objectives, the present invention adopts the following technical solution: a method for real-time wavelength tuning of a plasma nanolaser, which is carried out according to the following method: constructing a plasma nanolaser with both magnetic and plasma characteristics, wherein the plasma nanolaser includes a substrate, a metal thin film layer formed on the substrate, a liquid gain medium disposed on the metal thin film layer, and magnetic-plasma core-shell nanoparticles distributed in the liquid gain medium.
[0008] An external magnetic field coil group is arranged around the plasma nanolaser. After the optical pump source excites the plasma nanolaser, a magnetic field is generated by the external magnetic field coil group to adjust the displacement of the magnetic-plasma core-shell nanoparticles. By changing the distance between the particles and the metal thin film layer, the laser emission wavelength of the plasma laser is tuned.
[0009] Preferably, the external magnetic field coil group includes multiple magnetic field coils and external devices corresponding to each of the multiple magnetic field coils. The multiple magnetic field coils are arranged vertically along six faces, with the plasma nanolaser as the cubic unit.
[0010] More preferably, before each wavelength tuning, the magnetic-plasma core-shell nanoparticles are first reset using the magnetic field generated by the multiple magnetic field coils, so that the distance between the single-layer nanoparticles and the metal thin film layer is 0; then, the displacement of the magnetic-plasma core-shell nanoparticles is adjusted by the magnetic field generated by the external magnetic field coil group, thereby tuning the laser emission wavelength of the plasma laser.
[0011] Preferably, the doping concentration of the magnetic-plasma core-shell nanoparticles in the liquid gain medium is 1×10⁻⁶. -8 g / ml - 2.3 × 10 -5 g / ml;
[0012] The magnetic-plasma core-shell nanoparticles are composite structures with a core-shell structure, which are either a magnetic nanoparticle core coated with a noble metal nanoshell or a noble metal nanoparticle core coated with a magnetic nanoshell.
[0013] The magnetic nanoparticle core or magnetic nanoshell is magnetic, and the noble metal nanoparticle core or noble metal nanoshell can generate localized surface plasmon effect (LSP); thus, the magnetic-plasma core-shell nanoparticles simultaneously possess magnetic and plasma properties, and their displacement can be controlled by the magnetic field generated by the external magnetic field coil assembly.
[0014] More preferably, the magnetic nanomaterials in the magnetic-plasma core-shell nanoparticles are magnetic compounds;
[0015] More preferably, the magnetic compound is Fe3O4 or γ-Fe2O3; the noble metal is Au, Ag or Pt, which have localized surface plasmon effects.
[0016] Preferably, the metal thin film material is a gold or silver film capable of generating surface plasmon resonance (SPP), with a thickness of 10 nm to 1 mm.
[0017] More preferably, the liquid gain medium is a semiconductor laser material of various colors capable of emitting laser light, and the concentration of the laser material is 1×10⁻⁶. -4 mg / ml-0.1gmg / ml. The liquid gain medium can be replaced, and the control range can be expanded by changing the particle size, type, or gain medium, thereby enabling real-time control of the wavelength of visible and near-infrared plasma lasers.
[0018] Based on the same inventive concept, the present invention also provides a plasma nanolaser source with real-time wavelength tunability, including a plasma nanolaser and an external magnetic field coil group disposed on the periphery of the plasma nanolaser, wherein the plasma nanolaser is excited by an optical pump source;
[0019] The plasma nanolaser includes a transparent substrate, a strip-shaped resonant cavity is formed inside the transparent substrate, a metal thin film layer is deposited at the bottom of the strip-shaped resonant cavity, and a liquid gain medium inlet and outlet channel is formed on the transparent substrate, which connects the two ends of the strip-shaped resonant cavity. The inlet and outlet channel and the strip-shaped resonant cavity together form a microfluidic channel, and the microfluidic channel is filled with liquid gain medium, in which magnetic-plasma core-shell nanoparticles are distributed.
[0020] The external magnetic field coil group is arranged around the plasma nanolaser. After the optical pump source excites the plasma nanolaser, the magnetic field generated by the external magnetic field coil group changes the displacement of the magnetic-plasma core-shell nanoparticles, thereby controlling the distance between the particles and the metal thin film layer, and thus tuning the laser emission wavelength of the plasma laser.
[0021] Preferably, the transparent substrate includes an upper substrate and a lower substrate, the strip resonant cavity is recessed on the lower substrate, the height of the strip resonant cavity is 5nm-1cm, and the liquid gain medium inlet / outlet channel is vertically opened on the upper substrate and communicates with the strip resonant cavity.
[0022] More preferably, the external magnetic field coil group includes three pairs of external magnetic field coils and external equipment for controlling the three pairs of external magnetic field coils, which are respectively arranged on both sides of the length direction, both sides of the width direction, and both sides of the height of the strip resonant cavity.
[0023] This invention also provides a chip, including a chip body and the aforementioned plasma nanolaser source, wherein the plasma nanolaser source is deposited on the chip via a lower substrate, and the plasma nanolaser source is used to provide a wavelength-tunable light source to the chip body. This chip can be applied to precise laser-induced fluorescence in the field of bioanalysis, and can also be integrated with other devices to expand its applications in drug discovery, micro / nano displays, optical communication, and on-chip light sources, enabling continuous and remote testing in various environments.
[0024] Compared with the prior art, the present invention has the following advantages:
[0025] This invention is based on a magnetic-plasma core-shell nanoparticle structure. By using a magnetic field generated by an external coil to alter the displacement of the magnetic-plasma core-shell nanoparticles, the distance between the nanoparticles and the metal thin film layer is changed, achieving real-time tunable SPASER wavelengths in the visible and near-infrared regions. Compared to existing SPASER wavelength control methods based on fixed plasma cavity structures and gain media, this non-contact control method has at least four advantages: First, repeated use does not affect or damage the structure, resulting in a long lifespan; second, the external magnetic field strength can be controlled to achieve remote control; third, the wavelength control response is very sensitive after the external magnetic field acts on the magnetic-plasma core-shell nanoparticles, and the wavelength control range is very precise; fourth, non-contact control of the SPASER wavelength using a magnetic field is unaffected by external environmental vibrations, temperature, humidity, etc., resulting in high stability. Integrating a real-time tunable nanolaser onto a chip can be applied to tunable imaging, dynamic filters, on-chip plasma sensing, and optical communication. Attached Figure Description
[0026] Figure 1 A schematic diagram of the structure of a plasma laser based on magnetic-plasma core-shell nanoparticles under the action of an external magnetic field coil provided by the present invention;
[0027] Figure 2 A schematic diagram of a chip structure equipped with a plasma nanolaser source provided by the present invention;
[0028] Figure 3 for Figure 2 Top view;
[0029] Figure 4 The variation of SPASER emission wavelength under different spacings between Fe3O4@Au nanoparticles (diameter@thickness, 20@15nm) and gold films. Detailed Implementation
[0030] The following specific embodiments further illustrate the implementation of the present invention and its beneficial effects, with the aim of helping to better understand the essence and spirit of the present invention, and should not be construed as limiting the scope of the present invention.
[0031] This invention provides a method for real-time wavelength tuning of a non-contact plasma nanolaser, which is performed according to the following method:
[0032] A plasma nanolaser exhibiting both magnetic and plasma properties is constructed. The plasma nanolaser includes a substrate, a metal thin film layer formed on the substrate, a liquid gain medium disposed on the metal thin film layer, and magnetic-plasmolytic core-shell nanoparticles distributed within the liquid gain medium. By arranging an external magnetic field coil array around the plasma nanolaser, after the plasma nanolaser is excited by an optical pump source, a magnetic field is generated by the external magnetic field coil array to adjust the displacement of the magnetic-plasmolytic core-shell nanoparticles, changing the distance between the particles and the metal thin film layer, thereby tuning the laser emission wavelength of the plasma laser.
[0033] It should be noted that this invention uses a liquid gain medium, and the doping concentration of the magnetic-plasma core-shell nanoparticles in the liquid gain medium is 1×10⁻⁶. -8 g / ml - 2.3 × 10 -5 The concentration range of g / ml is set to control the number of nanoparticles, ensuring a monolayer arrangement of nanoparticles in the liquid gain medium. Under the influence of an external magnetic field, the liquid gain medium facilitates the adjustment of the displacement of the magnetic-plasma core-shell nanoparticles, changing the distance between the particles and the metal thin film layer. In specific applications, the liquid gain medium consists of a laser dye and a solvent capable of dissolving the semiconductor laser dye. Various colors of laser dyes can be widely used in the liquid gain medium, such as red dyes DCM and DCJTB, green dyes CsPbBr3 quantum dots, and blue dyes TPD. The concentration of the laser dye is 1×10⁻⁶. -4 mg / ml-0.1gmg / ml; it should be further noted that the liquid gain medium can be replaced. By changing the particle size, type or gain medium, the SPASER wavelength in the full visible light and near infrared can be adjusted in real time.
[0034] It should be further explained that the magnetic-plasma core-shell nanoparticles in the plasma nanolaser are composite structures with a core-shell structure, i.e., a magnetic nanoparticle core is encased in a noble metal nanoshell, or vice versa. The magnetic nanoparticle core or shell is magnetic, and the noble metal nanoparticle core or shell can generate a local surface plasmon (LSP) effect. The magnetic-plasma core-shell nanoparticles possess both magnetic and plasma properties, and their displacement can be controlled by a magnetic field generated by an external coil. The metal thin film layer material is a material layer capable of generating propagating surface plasmon (SPP), such as a silver or gold film. The LSP and SPP are coupled to produce composite plasma properties. In specific applications, the magnetic nanoparticles can be magnetic compounds such as Fe3O4 or γ-Fe2O3; the noble metal nanomaterials are noble metals capable of generating a local surface plasmon effect, such as Au, Ag, and Pt.
[0035] It should be further explained that before wavelength tuning or the next wavelength tuning, the magnetic-plasma core-shell nanoparticles need to be reset first by using the magnetic field generated by the multiple magnetic field coils, so that the distance between the single-layer nanoparticles and the metal thin film layer is 0; then, the displacement of the magnetic-plasma core-shell nanoparticles is adjusted by the magnetic field generated by the external magnetic field coil group, thereby tuning the laser emission wavelength of the plasma laser.
[0036] The external magnetic field coil setup is not a single coil, but rather comprises multiple coils. These coils are arranged vertically along the six faces of the plasma nanolaser, using the plasma nanolaser as a cubic unit. The upper and lower coils primarily adjust the height of the particles, while the left, right, front, and rear coils are responsible for adjusting the position of the magnetic-plasma core-shell nanoparticles to prevent aggregation or to position them ideally. Therefore, the purpose of this setup is to precisely adjust the position of the magnetic-plasma core-shell nanoparticles and their distance from the metal thin film layer in three-dimensional space.
[0037] This invention is based on a magnetic-plasma core-shell nanoparticle structure. By using a magnetic field generated by an external coil to alter the displacement of the magnetic-plasma core-shell nanoparticles and change the distance between the particles and the metal film, the SPASER wavelength can be tuned in real time. Furthermore, by changing the particle size, type, and gain medium, a SPASER with continuously tunable wavelength can be achieved in the full visible and near-infrared regions. This method can be used repeatedly without affecting or damaging the plasma nanolaser structure, offering the advantage of long lifespan. During wavelength tuning, the external magnetic field strength can be controlled to achieve remote control. The wavelength tuning response is highly sensitive after the external magnetic field acts on the magnetic-plasma core-shell nanoparticles, and the wavelength tuning range is very precise. Utilizing a magnetic field for non-contact wavelength tuning of the SPASER is unaffected by external environmental vibrations, temperature, humidity, etc., resulting in high stability.
[0038] Based on the same inventive concept, embodiments of the present invention also provide a plasma nanolaser source with real-time wavelength tunability, specifically as follows: Figure 1-2 As shown, the device includes a plasma nanolaser and an external magnetic field coil group 8 disposed around the plasma nanolaser. The plasma nanolaser is excited by an optical pump source. The plasma nanolaser includes a transparent substrate with a strip-shaped resonant cavity inside. A metal thin film layer 5 is deposited at the bottom of the strip-shaped resonant cavity. A liquid gain medium inlet / outlet channel 1 connecting the two ends of the strip-shaped resonant cavity is also formed on the transparent substrate. The inlet / outlet channel 1 and the strip-shaped resonant cavity together form a microfluidic channel. Liquid gain medium 4 is injected into the microfluidic channel, and magnetic-plasma core-shell nanoparticles 6 are distributed in the liquid gain medium. The external magnetic field coil group 8 is disposed around the plasma nanolaser. After the plasma nanolaser is excited by the optical pump source, the magnetic field generated by the external magnetic field coil group 8 changes the displacement of the magnetic-plasma core-shell nanoparticles 6, thereby controlling the distance between the nanoparticles and the metal thin film layer 5. The transparent substrate is chosen to facilitate the introduction of light from the optical pump source for optical pumping. The transparent substrate is preferably made of a polymer material.
[0039] It should be noted that, for ease of processing, the above-mentioned substrate includes an upper substrate 2 and a lower substrate 3. The strip resonant cavity is recessed on the lower substrate 3, and the height of the strip resonant cavity is 5nm-1cm. The liquid gain medium 4 inlet / outlet channel 1 is vertically opened on the upper substrate 2 and is connected to the strip resonant cavity.
[0040] In the actual fabrication of a plasma nanolaser source with real-time wavelength tunability, the plasma nanolaser is first fabricated. A strip-shaped resonant cavity is formed on a lower substrate using imprinting technology. A metal thin film layer 5 is deposited at the bottom of the strip-shaped resonant cavity on the lower substrate. The upper substrate 2 and the lower substrate 3, which have inlet / outlet channels 1, are then processed using a thermal bonding process. Finally, the inlet / outlet channels 1 and the strip-shaped resonant cavity together form a microfluidic channel. It should be further noted that the aforementioned inlet / outlet channels 1 include columnar injection holes and outlet holes, and the connection between the injection holes and the outlet holes and the two ends of the strip-shaped resonant cavity is smooth, forming a "U"-shaped structure. Replacing the liquid gain medium can avoid residue. A liquid gain medium mixed with magnetic-plasma core-shell nanoparticles 6 is injected into the microfluidic channel, thereby forming the plasma nanolaser.
[0041] Then, an external magnetic field coil group 8 is configured around the periphery of the plasma nanolaser. The external magnetic field coil group 8 includes three pairs of external magnetic field coils and external equipment for controlling the three pairs of external magnetic field coils. The three pairs of external magnetic field coils are respectively arranged on both sides of the length direction, both sides of the width direction, and both sides of the height of the strip resonant cavity, as shown in the figure below. Figure 2 As shown, the arrangement of three pairs of external magnetic field coils can effectively adjust the initial position and distribution of nanoparticles from both sides in the length direction, both sides in the width direction, and both sides in the height direction, and can also avoid the problem of agglomeration of scattered particles after one use.
[0042] In the wavelength tuning process, the external magnetic field coil group 8 is first used to reset the nanoparticles, ensuring that the distance between the monolayer nanoparticles and the metal thin film layer 5 is zero. Then, the plasma nanolaser is excited by an external pump source. Next, an external magnetic field is formed by the external magnetic field coil group 8, and the intensity and direction of this field are controlled to manage the movement of the magnetic-plasma core-shell nanoparticles 6 in the liquid gain medium 4. This alters the distance between the core-shell particles and the metal thin film layer 5, with the distance changing within a range of approximately 0-100 nm. This allows for real-time tuning of the plasma characteristics of the particle-film composite structure, achieving real-time tuning of the plasma laser's output wavelength. Furthermore, by changing the particle size, type, and gain medium, real-time tuning of the SPASER wavelength in the full visible and near-infrared range can be achieved.
[0043] This plasma nanolaser source, with its real-time wavelength tunability, can be applied to precise laser-induced multicolor fluorescence in the field of bioanalysis. It can also be integrated into other devices or chips to expand its applications in drug discovery, micro-nano displays, optical communication, and on-chip light sources, enabling continuous and remote testing in various environments.
[0044] For example, we also provide a chip that integrates the aforementioned plasma nanolaser source on the basis of existing chip bodies. Specifically, as shown... Figure 2-3As shown, the plasma nanolaser source includes a plasma nanolaser and an external magnetic field coil group 8 disposed around the plasma nanolaser. The plasma nanolaser includes an upper substrate 2 and a lower substrate 3. The lower substrate 3 is deposited on the chip body. A strip-shaped resonant cavity parallel to the bottom surface of the lower substrate is formed on the top surface of the lower substrate 3 by imprinting technology. A metal thin film layer 5 is deposited at the bottom of the strip-shaped resonant cavity. A liquid gain medium 4 inlet / outlet channel 1 is vertically opened on the upper substrate 2, connecting the two ends of the strip-shaped resonant cavity. The inlet / outlet channel 1 specifically includes an injection hole and an outlet hole. The inlet / outlet channel 1 and the strip-shaped resonant cavity together form a "U"-shaped microfluidic channel. The microfluidic channel is filled with liquid gain medium 4, and magnetic-plasma core-shell nanoparticles 6 are distributed in the liquid gain medium 4. The external magnetic field coil group 8 is disposed around the plasma nanolaser. Figure 2-3 As shown, the external magnetic field coil group 8 includes three pairs of magnetic field coils, each pair of magnetic field coils being arranged along both sides of the length direction, both sides of the width direction, and both sides of the height of the strip resonant cavity. The magnetic field generated by these coils alters the displacement of the magnetic-plasma core-shell nanoparticles 6, thereby controlling the distance between the particles and the metal thin film layer 5.
[0045] In experiments using this device for real-time tunable SPASER wavelengths, such as... Figure 4 As shown, the spacing h (2nm, 10nm, 20nm, 50nm) between Fe3O4@Au (diameter@thickness, 20@15nm) core-shell nanoparticles and the gold film was adjusted by the magnetic field generated by the outer coil. Figure 4 It was found that with increasing spacing, the SPASER wavelength position exhibits a significant blue shift, moving from 630nm to 567nm. By further altering the particle size, type, and gain medium, this device enables real-time control of the SPASER wavelength in the full visible and near-infrared regions, thereby constructing a plasma laser with advantages such as non-contact control, long lifetime, high sensitivity and precision, and real-time wavelength tuning.
[0046] The above embodiments are merely illustrative examples of the present invention and do not constitute a limitation on the scope of protection of the present invention. Any designs that are the same as or similar to the present invention are within the scope of protection of the present invention.
Claims
1. A method for real-time wavelength tuning of a plasma nanolaser, characterized in that, Follow these steps: A plasma nanolaser with both magnetic and plasma properties is constructed. The plasma nanolaser includes a substrate, a metal thin film layer formed on the substrate, a liquid gain medium disposed on the metal thin film layer, and magnetic-plasma core-shell nanoparticles distributed in the liquid gain medium. An external magnetic field coil group is arranged around the plasma nanolaser. After the optical pump source excites the plasma nanolaser, a magnetic field is generated by the external magnetic field coil group to adjust the displacement of the magnetic-plasma core-shell nanoparticles. By changing the distance between the particles and the metal thin film layer, the laser emission wavelength of the plasma laser is tuned.
2. The method for real-time wavelength tuning of a plasma nanolaser according to claim 1, characterized in that, The external magnetic field coil group includes multiple magnetic field coils and external devices corresponding to each of the multiple magnetic field coils. The multiple magnetic field coils are arranged vertically along six faces, with the plasma nanolaser as the cubic unit.
3. The method for real-time wavelength tuning of a plasma nanolaser according to claim 2, characterized in that, Before each wavelength tuning, the magnetic field generated by the multiple magnetic field coils is first used to reset the magnetic-plasma core-shell nanoparticles, so that the distance between the single-layer nanoparticles and the metal thin film layer is 0; then, the magnetic field generated by the external magnetic field coil group is used to adjust the displacement of the magnetic-plasma core-shell nanoparticles and tune the laser emission wavelength of the plasma laser.
4. The method for real-time wavelength tuning of a plasma nanolaser according to claim 1, characterized in that, The doping concentration of the magnetic-plasma core-shell nanoparticles in the liquid gain medium is 1×10⁻⁶. -8 g / ml - 2.3 × 10 -5 g / ml; The magnetic-plasma core-shell nanoparticles are composite structures with a core-shell structure, which are either a magnetic nanoparticle core coated with a noble metal nanoshell or a noble metal nanoparticle core coated with a magnetic nanoshell. The magnetic nanoparticle core or magnetic nanoshell is magnetic, and the noble metal nanoparticle core or noble metal nanoshell can generate localized surface plasmon effect (LSP); thus, the magnetic-plasma core-shell nanoparticles simultaneously possess magnetic and plasma properties, and their displacement can be controlled by the magnetic field generated by the external magnetic field coil assembly.
5. The method for real-time wavelength tuning of a plasma nanolaser according to claim 4, characterized in that, The magnetic nanomaterials in the magnetic-plasma core-shell nanoparticles are magnetic compounds; the magnetic compounds are Fe3O4 or γ-Fe2O3; and the noble metals are Au, Ag, or Pt, which have localized surface plasmon effects.
6. The method for real-time wavelength tuning of a plasma nanolaser according to claim 1, characterized in that, The metal thin film layer material is a gold or silver film capable of generating surface plasmon resonance (SPP), with a thickness of 10 nm to 1 mm.
7. A plasma nanolaser source with real-time tunable wavelength, characterized in that, The system includes a plasma nanolaser and an external magnetic field coil array disposed around the periphery of the plasma nanolaser, wherein the plasma nanolaser is excited by an optical pump source. The plasma nanolaser includes a transparent substrate, a strip-shaped resonant cavity is formed inside the transparent substrate, a metal thin film layer is deposited at the bottom of the strip-shaped resonant cavity, and a liquid gain medium inlet and outlet channel connecting the two ends of the strip-shaped resonant cavity is also formed on the transparent substrate. The inlet and outlet channel and the strip-shaped resonant cavity together form a microfluidic channel, and the microfluidic channel is filled with liquid gain medium, in which magnetic-plasma core-shell nanoparticles are distributed. The external magnetic field coil group is arranged around the plasma nanolaser. After the optical pump source excites the plasma nanolaser, the magnetic field generated by the external magnetic field coil group changes the displacement of the magnetic-plasma core-shell nanoparticles, thereby controlling the distance between the particles and the metal thin film layer, and thus tuning the laser emission wavelength of the plasma laser.
8. The plasma nanolaser source according to claim 7, characterized in that, The transparent substrate includes an upper substrate and a lower substrate. The strip resonant cavity is recessed on the lower substrate and has a height of 5nm-1cm. The liquid gain medium inlet / outlet channel is vertically opened on the upper substrate and communicates with the strip resonant cavity.
9. The plasma nanolaser source according to claim 8, characterized in that, The external magnetic field coil group includes three pairs of external magnetic field coils and external equipment for controlling the three pairs of external magnetic field coils, which are respectively arranged on both sides of the length direction, both sides of the width direction, and both sides of the height of the strip resonant cavity.
10. A chip, comprising a chip body, characterized in that, It also includes the plasma nanolaser source of claim 9, wherein the plasma nanolaser source is deposited on the chip via its underlying substrate, and the plasma nanolaser source is used to provide a wavelength-tunable light source to the chip body.