阅读说明：本技术 一种可调谐双波长等离子体纳米激光器及其光学材料 (Tunable dual-wavelength plasma nano laser and optical material thereof ) 是由 范春珍 任佩雯 于 2020-06-03 设计创作，主要内容包括：本发明属于微纳光学领域,具体公开了一种可调谐双波长等离子体纳米激光器及其光学材料,光学材料由基底、增益介质及周期性排列的二维石墨烯阵列组成,其中石墨烯单元包括一个π型石墨烯谐振器和一个空心矩形石墨烯谐振器,本发明结构简单,可操作性强,结构在增益介质的辅助作用下,极大地补偿了系统的固有损耗,共振强度被数量级放大,实现了低阈值的受激辐射,并且可以通过调节增益系数实现双波长的选择性激发,此外,通过调节入射光极化角度可以实现强度可调谐的激光现象,本发明为可调谐双波长等离子体纳米激光器的设计开辟了全新的技术途径。(The invention belongs to the field of micro-nano optics, and particularly discloses a tunable dual-wavelength plasma nano laser and an optical material thereof, wherein the optical material consists of a substrate, a gain medium and a two-dimensional graphene array which is periodically arranged, and a graphene unit comprises a pi-type graphene resonator and a hollow rectangular graphene resonator.)

1. An optical material for realizing a tunable dual-wavelength plasma nano laser is characterized in that: the graphene-based planar resonator comprises a substrate, a gain medium and graphene structural units, wherein the gain medium is arranged on the substrate, the graphene structural units are periodically arranged on the gain medium and form a two-dimensional array, and each graphene structural unit comprises a pi-type graphene resonator and a hollow rectangular graphene resonator.

2. The optical material for realizing a tunable dual wavelength plasmonic nanometer laser of claim 1, wherein: the arrangement periods of the structural units on the substrate along the x axis and the y axis are respectively P_x=400 nm, P_y=280 nm, wherein the length and width of the outside of the hollow rectangular graphene resonator cavity are respectively l₁=180 nm，w₁=80 nm, length and width of the resonator interior are l, respectively₂=100 nm，w₂=30 nm; the long arm of the Pi-type graphene resonator is a continuous strip and is continuously arranged along the x-axis direction, and the length and the width of the two short arms are l respectively₃=30 nm, w₃=30 nm, and the coupling distance between the pi-type graphene resonator and the hollow rectangular graphene resonator is s =60 nm.

3. The optical material for realizing a tunable dual wavelength plasmonic nanometer laser of claim 2, wherein: the material used by the graphene structural unit is graphene with the thickness of 1 nm.

4. The optical material for realizing a tunable dual wavelength plasmonic nanometer laser of claim 3, wherein: the gain medium is a dielectric medium with an imaginary refractive index, and the gain medium is doped PbS semiconductor quantum dots with the structural thickness of 30 nm.

5. The optical material for realizing a tunable dual wavelength plasmonic nanometer laser of claim 4, wherein: the substrate is a silicon dioxide dielectric material.

6. A tunable dual-wavelength plasma nano laser is characterized in that: optical material comprising the implementation of tunable dual wavelength plasmonic nanolaser as claimed in any of claims 1-5, said plasmonic nanolaser having the function of tunable dual wavelength emission.

Technical Field

The invention belongs to the technical field of micro-nano optics, and particularly relates to a tunable dual-wavelength plasma nano laser and an optical material thereof.

Background

The interaction between light and free electrons on the surface of metal can generate electromagnetic wave oscillation to form surface plasma resonance, so that the optical field around the material is highly concentrated, the local electric field is greatly enhanced, the optical diffraction limit is overcome, and the graphene is formed by sp atoms of carbon atoms²The two-dimensional honeycomb lattice type carbon nano material composed of hybrid tracks can generate plasmons on the surface, and has the characteristics ofThe graphene plasma device has excellent electromagnetic properties, and has important application prospects in the fields of micro-nano optics and material science.

With the rapid development of scientific technology, the plasma nano laser is widely applied in the fields of scientific research, biomedicine, electronic information and the like, the traditional laser cannot break through the diffraction limit, the space size of the traditional laser is limited by the wavelength magnitude, the requirement of components with higher integration level cannot be met, the development and the application of the laser in various fields are severely limited, the development and the application of the laser in various fields can be realized by utilizing the sub-wavelength scale near-field optical effect of a metamaterial based on the theoretical basis of surface plasmon polariton photonics, electromagnetic radiation and the like, the diffraction limit can be effectively broken through, the magnitude order enhancement of a local electromagnetic field can be realized, the sub-wavelength and nano-scale laser emission can be realized by the surface plasmon-based nano laser, the characteristics of miniaturization and high integration of the surface plasmon are one of the most effective improvement methods for the miniaturization of the current laser, and the surface plasmon needs to be obtained, the high intrinsic loss of metal leads to the high threshold characteristic of the laser, so that the energy loss of the gain medium compensation structure can be introduced into the structure, the electric field energy is obviously enhanced, and the diffraction limit is broken through; in 2009, Noginov et al prepared a structure consisting of a gold core and a silicon dioxide shell doped with a gain medium, under the action of pump light, the gain medium completely compensated the intrinsic loss of the system, first realized a plasma laser on experiments, in 2013, Zhou et al realized the directional emission of plasma laser on experiments through the combined structure of a solid gain material and a metal nanoparticle array, in 2019, Fernandez-Bravo et al realized a subwavelength low-threshold plasmon nanometer laser based on the metamaterial structure of a silver nanoparticle array, based on the surface plasmon characteristics of the metamaterial, a small-sized, high-directional coupling output efficiency nanometer laser structure could be designed, which is of great significance for the research of more integrated and high-beam coupling efficiency lasers.

Disclosure of Invention

The invention aims to provide a tunable dual-wavelength plasma nano laser and an optical material thereof.

In order to achieve the purpose, the invention adopts the technical scheme that:

an optical material for realizing a tunable dual-wavelength plasma nano laser comprises a substrate, a gain medium and a graphene structural unit, wherein the gain medium is arranged on the substrate, the graphene structural unit is periodically arranged on the gain medium and forms a two-dimensional array, and the graphene structural unit comprises a pi-type graphene resonator and a hollow rectangular graphene resonator.

Furthermore, the arrangement periods of the structural units on the substrate along the x axis and the y axis are respectively P_x＝400nm,P_y280nm, wherein the length and width of the outside of the hollow rectangular graphene resonator cavity are respectively l₁＝180nm，w₁Length and width of the resonator interior are l, respectively, 80nm₂＝100nm，w₂30 nm; the long arm of the Pi-type graphene resonator is a continuous strip and is continuously arranged along the x-axis direction, and the length and the width of the two short arms are l respectively₃＝30nm,w₃The coupling distance between the pi-type graphene resonator and the hollow rectangular graphene resonator is s 60nm, which is 30 nm.

Further, the material used for the graphene structural unit is graphene with the thickness of 1 nm.

Further, the gain medium is a dielectric medium with an imaginary refractive index, and the gain medium is doped PbS semiconductor quantum dots with the structural thickness of 30 nm.

Further, the substrate is a silicon dioxide dielectric material.

A tunable dual-wavelength plasma nano laser comprises the optical material for realizing the tunable dual-wavelength plasma nano laser, and the plasma nano laser has the function of transmitting tunable dual-wavelength.

The invention has the advantages that:

1. according to the invention, the graphene metamaterial and the gain medium are innovatively combined and periodically arranged, the periodically arranged graphene structure units comprise a pi-type graphene resonator and a hollow rectangular graphene resonator, the graphene layer is of a two-dimensional single-layer planar structure, complex structures such as structure stacking are not involved, the structure is simple, the operability is strong, the graphene structure is suitable for large-scale batch preparation, and the preparation precision is high;

2. the material for realizing the tunable dual-wavelength plasma nano laser is a graphene metamaterial, the graphene has metallicity, the surface can generate plasmons, and the graphene has lower plasma transmission loss in a terahertz frequency domain;

3. the tunable dual-wavelength plasma nanometer laser phenomenon is realized by dynamically adjusting the gain coefficient, the spectrum can be selectively excited by setting the gain coefficient, different laser wavelengths can be output, meanwhile, the dynamic regulation and control of the dual wavelengths can be realized, and the diversity development of the laser is enriched;

4. the invention can realize the non-contact dynamic regulation and control of the excitation wave intensity by changing the polarization angle of incident light, and the emission frequency corresponding to the excitation wavelength is always kept unchanged in the regulation and control process.

Drawings

FIG. 1: the invention provides an integral structure schematic diagram and a unit structure top view of a tunable dual-wavelength plasma nano laser;

FIG. 2: the invention provides a transmission spectrogram of a tunable dual-wavelength plasma nano laser under different gain coefficients alpha;

FIG. 3: the invention provides a spectral transmittance point line graph corresponding to two excitation wavelengths at different gain coefficients alpha;

FIG. 4: the invention provides two corresponding transmission spectrograms of excitation wavelengths under different polarization angles.

Detailed Description