CN102832431A - Graphene-based S-shaped waveguide - Google Patents
Graphene-based S-shaped waveguide Download PDFInfo
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- CN102832431A CN102832431A CN2012102896861A CN201210289686A CN102832431A CN 102832431 A CN102832431 A CN 102832431A CN 2012102896861 A CN2012102896861 A CN 2012102896861A CN 201210289686 A CN201210289686 A CN 201210289686A CN 102832431 A CN102832431 A CN 102832431A
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Abstract
A graphene-based S-shaped waveguide comprises a silicon substrate. A silicon dioxide substrate is arranged on the silicon substrate, the upper surface of the silicon dioxide substrate is an S-shaped wavy surface, a graphene layer is laid on the silicon dioxide substrate, chemical potential of graphene of the graphene layer is 0.8eV (corresponding carrier concentration is 4.7e<13>cm<-2>), and the shape of the graphene layer is matched with that of the upper surface of the silicon oxide substrate. The chemical potential of the graphene can be realized by a chemical doping method, and a molecular adsorption technology for tetracyanoquinodimethane and the like is adopted for doping, so that the carrier concentration of the graphene can reach 1e<14>cm<-2>.
Description
Technical field
The present invention relates to a kind of S shape curved waveguide based on Graphene, especially this can propagate the surface plasma polarized wave based on the S shape curved waveguide of Graphene on curved surface.
Background technology
The appearance of surface plasma polarized wave for breaking through diffraction limit, realizes that the photoelectric device of sub-wavelength and optoelectronic IC provide possibility.Fiber waveguide is a requisite device in the integrated optics.Because the change of direction of beam propagation in the fiber waveguide, the bending in the fiber waveguide is necessary.Common based on metallic surface plasma polarization sonic wave guide when running into uneven plane such as bending; The radiation loss that is caused by curvature can produce because the refractive index ratio of the surface plasma polarized wave supported is less on the metal, locality relatively a little less than; In scattering loss behind a part of momentum; The refractive index of this moment is probably less than airborne refractive index, transmission that at this moment can not support surface plasma polarization ripple, and metal will be used in the curved waveguide device; Be to realize that through design optical transform structure on metal the structure of optical transform is as shown in Figure 1 mostly.And Graphene has very strong pliability and stability, and through chemical doping, people can regulate the refractive index of the surface plasma polarized wave of supporting on the Graphene, thereby regulates the locality of the surface plasma polarized wave of supporting on the Graphene.With respect to metal; Pass through chemical doping; The locality of Graphene can be far longer than common metal; And Graphene has very strong pliability and stability, need not do any optical transform structure also well guiding surface plasma polarization ripple propagate along curved surface, need do the restriction that the optical transform structure could good transmission in the metal bending waveguide thereby overcome.Up to now, still unmanned use Graphene designs the waveguide of S shape.
Summary of the invention
Technical problem: the present invention provides a kind of S shape waveguide based on Graphene, need not do any optical transform structure and promptly can on curved surface, propagate the surface plasma polarized wave, and processing is simple, is easy to realize.
The present invention adopts following technical scheme:
A kind of S shape waveguide based on Graphene; Comprise silicon substrate; On silicon substrate, be provided with silicon dioxide substrates, the upper surface of silicon dioxide substrates is a S shape contoured surface, on silicon dioxide substrates, is covered with graphene layer; And the chemical potential of graphene layer is 0.8eV, and the shape of the shape of graphene layer and silicon dioxide substrates upper surface matches.
With the prior art ratio, the present invention has the following advantages:
The present invention uses Graphene to design the waveguide of S shape, is to use metal to design curved waveguide in the prior art, because the refractive index of the surface plasma polarized wave of supporting on the metal is less relatively; Locality is not fine, generally all is through design optical transform structure on metal, for example among Fig. 1 on metal 4 the different dielectric layer 5 of laying dielectric constant thickness; 6; 7 realize, processing difficulties is unfavorable for practical application.And Graphene has very strong pliability and stability; Its refractive index can be regulated through the mode of chemical doping; Make that the locality of the surface plasma polarized wave supported on it is very strong, need not do any optical transform structure also well guiding surface plasma polarization ripple along the Graphene surface propagation of bending.This invention is processed easyly, is easy to realize, has overcome to do the restriction that the optical transform structure could good transmission in the metal bending waveguide.
Description of drawings
Fig. 1 is the end view of the optical transform structure on the metal surface plasma body polarization ripple curved waveguide, and 4 is metal, and 5,6,7 are respectively thickness, the dielectric layer that dielectric constant is different.
Fig. 2 is a structure side view of the present invention, comprises the three-decker that is superimposed together, and nethermost is silicon base, silicon base upper berth silicon dioxide substrates, silicon dioxide substrates upper berth graphene layer.The silicon dioxide substrates upper surface is provided with S shape contoured surface, and wherein, the diameter D that forms the semicircle of this S shape is 120nm.
Fig. 3 is to be 300K in temperature, and when chemical potential was 0.8 eV, the real part of the effective refractive index of the surface plasma polarized wave of supporting on the Graphene was with the change curve of frequency.Figure can find out that the real part of the effective refractive index of the surface plasma polarized wave of supporting on the Graphene is all very big in a very wide frequency band thus, and promptly locality is very strong.
Fig. 4 is the simulation result figure of y direction magnetic field distribution of the present invention, and when frequency was 160THz, left end was the incident end, and right-hand member is an exit end, and visible by figure, the surface plasma polarized wave has well passed to right-hand member from left end on the Graphene surface of bending.
Embodiment:
A kind of S shape waveguide based on Graphene; Comprise silicon substrate 3; On silicon substrate 3, be provided with silicon dioxide substrates 2; The upper surface of silicon dioxide substrates 2 is a S shape contoured surface, on silicon dioxide substrates 2, is covered with graphene layer 1, and the chemical potential of graphene layer 1 is that (corresponding carrier concentration is 4.7e to 0.8eV
13Cm
-2), the shape of the shape of graphene layer 1 and silicon dioxide substrates 2 upper surfaces matches.The chemical potential of Graphene can realize through the mode of chemical doping, utilizes tetra cyanogen subculture dimethyl benzene quinone equimolecular adsorption technology to mix now in the technology, can be so that the carrier concentration of Graphene reaches 1e
14Cm
-2
The conductivity of Graphene can be by the Kubo formulate (" Dyadic Green ' s functions and guided surface waves for a surface conductivity model of graphene; " J. Appl. Phys. 103 (6); 064302,2008).
Wherein-e is an electron charge; Be Planck's constant;
is that Fermi's dirac distributes;
is Boltzmann constant;
is angular frequency;
is chemical potential;
representes scattered power,
represent temperature.The chemical potential of Graphene and the concentration relationship of charge carrier can be expressed as as follows:
Wherein
is carrier concentration, and
is Fermi's speed.Can know that by above-mentioned formula the conductivity of Graphene is along with the variation of chemical potential changes.And can change the carrier concentration of Graphene through the mode of chemical doping, thereby change the chemical potential of Graphene, and then can be so that the loss of the surface plasma polarized wave of supporting on it can be reduced to very little.Therefore, Graphene is expected to become in surface plasma polarized wave field a reasonable selection of alternative metals.
Claims (1)
1. S shape waveguide based on Graphene; Comprise silicon substrate (3); On silicon substrate (3), be provided with silicon dioxide substrates (2), the upper surface of silicon dioxide substrates (2) is a S shape contoured surface, on silicon dioxide substrates (2), is covered with graphene layer (1); And the chemical potential of graphene layer (1) is 0.8eV, and the shape of the shape of graphene layer (1) and silicon dioxide substrates (2) upper surface matches.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012102896861A CN102832431A (en) | 2012-08-14 | 2012-08-14 | Graphene-based S-shaped waveguide |
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| CN2012102896861A CN102832431A (en) | 2012-08-14 | 2012-08-14 | Graphene-based S-shaped waveguide |
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| CN102832431A true CN102832431A (en) | 2012-12-19 |
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| CN2012102896861A Pending CN102832431A (en) | 2012-08-14 | 2012-08-14 | Graphene-based S-shaped waveguide |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1417884A (en) * | 2001-10-30 | 2003-05-14 | 汤姆森许可贸易公司 | Curved waveguide element and transmission equipment comprising the element |
| WO2011162955A2 (en) * | 2010-06-22 | 2011-12-29 | The Trustees Of The University Of Pennsylvania | Manipulating and routing optical signal narrow paths on graphene and graphene as a platform for metamaterials |
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2012
- 2012-08-14 CN CN2012102896861A patent/CN102832431A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1417884A (en) * | 2001-10-30 | 2003-05-14 | 汤姆森许可贸易公司 | Curved waveguide element and transmission equipment comprising the element |
| WO2011162955A2 (en) * | 2010-06-22 | 2011-12-29 | The Trustees Of The University Of Pennsylvania | Manipulating and routing optical signal narrow paths on graphene and graphene as a platform for metamaterials |
| WO2011162955A3 (en) * | 2010-06-22 | 2012-03-22 | The Trustees Of The University Of Pennsylvania | Manipulating and routing optical signal narrow paths on graphene |
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Application publication date: 20121219 |