阅读说明：本技术 一种基于石墨烯的混杂等离激元波导结构 (Hybrid plasmon waveguide structure based on graphene ) 是由 周开军 郭靖生 张洪 于 2021-01-21 设计创作，主要内容包括：本发明提供了一种基于石墨烯的混杂等离激元波导结构,包括：第一波导结构和第二波导结构,第一波导结构位于第二波导结构的上方；第二波导结构包括位于下层的第一电介质和平铺在第一电介质上的石墨烯；第一波导结构包括位于石墨烯之上的第二电介质和放置在第二电介质130上的第三电介质；第一电介质和第二电介质的折射率n的取值范围为1≤n≤2；第三电介质的折射率n>2。本结构可以在太赫兹波段进行模式束缚,且利用石墨烯产生等离激元,使其模式可调。(The invention provides a graphene-based hybrid plasmon waveguide structure, which comprises: the waveguide structure comprises a first waveguide structure and a second waveguide structure, wherein the first waveguide structure is positioned above the second waveguide structure; the second waveguide structure comprises a first dielectric layer positioned at the lower layer and graphene paved on the first dielectric layer; the first waveguide structure includes a second dielectric over graphene and a third dielectric disposed on the second dielectric 130; the value range of the refractive index n of the first dielectric medium and the second dielectric medium is more than or equal to 1 and less than or equal to 2; the refractive index n of the third dielectric is > 2. Mode constraint can be carried out at terahertz wave band to this structure, and utilizes graphite alkene to produce the plasmon, makes its mode adjustable.)

1. A graphene-based hybrid plasmonic waveguide structure, comprising: the waveguide structure comprises a first waveguide structure and a second waveguide structure, wherein the first waveguide structure is positioned above the second waveguide structure;

the second waveguide structure includes a first dielectric 110 underlying and graphene 120 laid on the first dielectric;

the first waveguide structure includes a second dielectric 130 over the graphene 120 and a third dielectric 140 disposed on the second dielectric 130;

the value range of the refractive index n of the first dielectric medium 110 and the second dielectric medium 130 is that n is more than or equal to 1 and less than or equal to 2; the refractive index n of said third dielectric 140 is > 2.

2. The graphene-based hybrid plasmonic waveguide structure of claim 1, wherein a lateral width at an end surface of the second dielectric 130 and a lateral width at an end surface of the third dielectric 140 are both less than 30 μ ι η, and a longitudinal width at an end surface of the second dielectric 130 is less than 7 μ ι η.

3. The graphene-based hybrid plasmonic waveguide structure of claim 2, wherein the third dielectric 140 is an elliptic cylinder structure, and the length of the elliptic cylinder is greater than 0 and equal to or less than 1 cm.

4. The graphene-based hybrid plasmonic waveguide structure of claim 3, wherein the major axis or the minor axis on the end surface of the elliptic cylindrical structure is in a horizontal direction, and the graphene plane and the upper surface of the second dielectric 130 are both horizontal planes.

5. The graphene-based hybrid plasmonic waveguide structure of claim 4, wherein the vertical direction on the end face of the elliptical pillar structure is a minor axis, the horizontal direction is a major axis, and the ratio of the major axis to the minor axis is 5: 3.

6. The graphene-based hybrid plasmonic waveguide structure of claim 1, wherein the short axis is 12 μ ι η and the long axis is 20 μ ι η.

7. The graphene-based hybrid plasmonic waveguide structure of claim 1, wherein the first dielectric 110 and the second dielectric 130 are HDPE and have a refractive index of 1.54, and the third dielectric 140 is GaAs and has a refractive index of 3.6.

8. The graphene-based hybrid plasmonic waveguide structure of claim 1, wherein the first dielectric 110 or the second dielectric 130 is MgF₂、SiO₂And KCl, and the third dielectric 140 is any one of ZnO, CdS, and Si.

9. The graphene-based hybrid plasmonic waveguide structure of claim 1, wherein the number of layers of graphene 120 is 1-5.

Technical Field

The invention relates to the technical field of waveguide structures, in particular to a graphene-based hybrid plasmon waveguide structure.

Background

The traditional hybrid plasmon waveguide mainly generates a plasmon mode based on metal, but the plasmon mode generated based on metal is not adjustable, and the research of the hybrid plasmon waveguide based on metal is mainly focused on a communication waveband, and the mode binding property of the hybrid plasmon waveguide in a terahertz waveband is poor.

Traditional dielectric medium loaded graphene plasmon waveguide, graphene multilayer structure waveguide and graphene ridge type plasmon waveguide utilize the adjustable characteristic of graphene, can realize dynamic adjustment of modes, but still have poor mode constraint capability.

Therefore, a waveguide structure capable of realizing dynamic mode tuning and strong mode confinement capability is needed.

Disclosure of Invention

The invention provides a graphene-based hybrid plasmon waveguide structure, which aims to solve the defects in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme.

A graphene-based hybrid plasmonic waveguide structure, comprising: the waveguide structure comprises a first waveguide structure and a second waveguide structure, wherein the first waveguide structure is positioned above the second waveguide structure;

the second waveguide structure includes a first dielectric 110 underlying and graphene 120 laid on the first dielectric;

the first waveguide structure includes a second dielectric 130 over the graphene 120 and a third dielectric 140 disposed on the second dielectric 130;

the value range of the refractive index n of the first dielectric medium 110 and the second dielectric medium 130 is that n is more than or equal to 1 and less than or equal to 2; the refractive index n of said third dielectric 140 is > 2.

Preferably, the lateral width on the end face of the second dielectric 130 and the lateral width on the end face of the third dielectric 140 are both smaller than 30 μm, and the longitudinal width on the end face of the second dielectric 130 is smaller than 7 μm.

Preferably, the third dielectric 140 is an elliptic cylinder structure having a length greater than 0 and equal to or less than 1 cm.

Preferably, the major axis or the minor axis on the end face of the elliptic cylindrical structure is a horizontal direction, and the graphene plane and the upper surface of the second dielectric 130 are both horizontal planes.

Preferably, the vertical direction on the end face of the elliptic cylindrical structure is the minor axis, the horizontal direction is the major axis, and the ratio of the major axis to the minor axis is 5: 3.

Preferably, the minor axis is 12 μm and the major axis is 20 μm.

Preferably, the first dielectric 110 and the second dielectric 130 are HDPE and have a refractive index of 1.54, and the third dielectric 140 is GaAs and has a refractive index of 3.6.

Preferably, the first dielectric 110 or the second dielectric 130 is MgF₂、SiO₂And KCl, and the third dielectric 140 is any one of ZnO, CdS, and Si.

Preferably, the number of layers of the graphene 120 is 1 to 5.

According to the technical scheme provided by the graphene-based hybrid plasmon waveguide structure, the structure can be used for mode binding in a terahertz wave band, and the mode of the structure can be adjusted by utilizing the graphene to generate plasmons.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic end view of a graphene-based hybrid plasmonic waveguide structure according to this embodiment;

fig. 2 is a side view of a graphene-based hybrid plasmonic waveguide structure of this embodiment.

Description of reference numerals:

110 first dielectric 120 graphene 130 second dielectric 140 third dielectric

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

For the convenience of understanding the embodiments of the present invention, the following description will be further explained by taking several specific embodiments as examples in conjunction with the drawings, and the embodiments are not to be construed as limiting the embodiments of the present invention.

Examples

Fig. 1 is a schematic end view of a graphene-based hybrid plasmonic waveguide structure of this embodiment, and fig. 2 is a side view of the graphene-based hybrid plasmonic waveguide structure of this embodiment, and referring to fig. 1 and fig. 2, the structure includes: the waveguide structure comprises a first waveguide structure and a second waveguide structure, wherein the first waveguide structure is positioned above the second waveguide structure; the second waveguide structure includes a first dielectric 110 underlying and graphene 120 laid on the first dielectric; the first waveguide structure includes a second dielectric 130 over the graphene 120 and a third dielectric 140 disposed on the second dielectric 130.

It should be noted that the refractive index n of the first dielectric 110 and the second dielectric 130 ranges from 1 to n 2; the refractive index n of the third dielectric 140 is > 2.

The lateral width at the end face of the second dielectric 130 and the lateral width at the end face of the third dielectric 140 are both smaller than 30 μm, and the longitudinal width at the end face of the second dielectric 130 is smaller than 7 μm.

Schematically, in the present embodiment, the third dielectric 140 is an elliptic cylinder structure, and the length of the elliptic cylinder is greater than 0 and less than or equal to 1 cm.

The major axis or minor axis on the end face on the elliptical pillar structure is the horizontal direction, and the graphene plane and the upper surface of the second dielectric 130 are both horizontal planes.

In this embodiment, the end face of the elliptic cylinder structure has a short axis in the vertical direction and a long axis in the horizontal direction, and the ratio of the long axis to the short axis is 5: 3. The minor axis was 12 μm and the major axis was 20 μm.

Specifically, the first dielectric 110 and the second dielectric 130 in this embodiment are HDPE and have a refractive index of 1.54, and the third dielectric 140 is GaAs and has a refractive index of 3.6.

In addition, the first dielectric 110 or the second dielectric 130 may also be MgF₂、SiO₂And KCl, the third dielectric 140 may also be any one of ZnO, CdS and Si.

Preferably, the number of layers of the graphene 120 is 1 to 5.

The specific application results for this example are as follows:

1. the Fermi level of the fixed graphene is 0.5eV, the number of layers is 3, the vertical direction on the end face of the GaAs elliptic cylinder structure is a short axis, the horizontal direction is a long axis, the short axis is 12 micrometers, the long axis is 20 micrometers, and the transverse width on the end face of the second dielectric HDPE130 is 20 micrometersWhen the longitudinal width on the end face is 0.5 μm, the mode field area of the ground state hybrid mode supported in the structure can reach-10^-3λ²And deep sub-wavelength constraint is realized, and the transmission length reaches dozens of micrometers.

2. When the lateral width on the end face of the second dielectric HDPE130 is 5 μm, the mode field area of the ground state hybrid mode supported in the structure reaches-10^-1λ²The transmission length can reach dozens of millimeters.

In summary, when the Fermi level of the graphene is adjusted to be 0.2eV-0.8eV, the adjustable ground state hybrid mode can be realized, and the mode field area (10-10) of the mode field area^-4-10^-1)λ²。

It will be appreciated by those skilled in the art that the various network elements shown in fig. 1 for simplicity only may be fewer in number than in an actual configuration, but such omissions are clearly not to be considered as a prerequisite for a clear and complete disclosure of the embodiments of the invention.

From the above description of the embodiments, it is clear to those skilled in the art that the present invention can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.