CN107589484A - A kind of tunable Terahertz beam splitter - Google Patents
A kind of tunable Terahertz beam splitter Download PDFInfo
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- CN107589484A CN107589484A CN201710708068.9A CN201710708068A CN107589484A CN 107589484 A CN107589484 A CN 107589484A CN 201710708068 A CN201710708068 A CN 201710708068A CN 107589484 A CN107589484 A CN 107589484A
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Abstract
The invention discloses a kind of tunable Terahertz beam splitter, including copper-based bottom transmission-type grating 1, alumina insulating layer 2, single-layer graphene film 3 and metal electrode 4, wherein, alumina insulating layer 2 is plated on the copper-based exit facet of bottom transmission-type grating 1, single-layer graphene film 3 is covered on alumina insulating layer 2, and metal electrode 4 is plated on single-layer graphene film 3；Two latasutures and a center seam are provided with copper-based bottom transmission-type grating 1, center seam is located at the copper-based center of bottom transmission-type grating 1, and two latasutures are located at the both sides of center seam respectively, and to the distance of center seam be l, set fluted on the copper-based exit facet of bottom transmission-type grating 1, groove is with periods lambdagEquidistantly it is uniformly distributed.Tunable Terahertz beam splitter model proposed by the present invention is that the thz beam control strip of the outer free space of plane carrys out new technological means, has potential using value in directions such as Terahertz communication, imaging and sensings.
Description
Technical field
The invention belongs to terahertz light electro-technical field, and in particular to a kind of tunable Terahertz beam splitter.
Background technology
In terahertz wave band, graphene is similar to Drude cast materials and shows superior electrical and optical performance,
These photoelectric properties can be effectively controlled by changing the chemical potential of graphene.Special performance based on graphene,
In past ten years, many tunable Terahertz device such as absorber, polarizer, amplitude and phase-modulators on graphene,
Wave filter, antenna and invisible device have been obtained for furtheing investigate.These devices are simple, efficient, compact, bio-sensing, communication,
The fields such as national defence, spectrum analysis show tempting application prospect.
Recently, graphene causes the concern of scientific circles to infrared and terahertz wave band light beam focusing and waveform modulated.
Such as (A.Vakil, and N.Engheta, Fourier optics on graphene, Physical the Review B of document one
2012,85 (7), 075434.) and (J.S.Li, Tunable focus the graphene-based terahertz of document two
Lens, Optics Communications 2016,359,268-271.) disclosed in infrared and Terahertz flat focus lens
Model, it is characterized in controlling to adjust graphene electrical conductivity or surface carrier concentration using voltage to realize to focus on light beam Jiao
The regulation and control of point position.These are tunable, and device is all that design is modulated in graphene planes interior focusing beam, in following slab guide
There is potential application in nano-integrated optics.Up to date, the mirror lens model on surface is surpassed to out-of-plane based on graphene
Thz beam is focused modulation and just reported, and on the research of the tunable Terahertz beam splitter of out-of-plane graphene
It at home and abroad there is no record.
The content of the invention
It is an object of the invention to propose a kind of tunable Terahertz beam splitter.
Realize technical scheme that the object of the invention uses for：A kind of tunable Terahertz beam splitter, including the transmission of copper-based bottom
Formula grating, alumina insulating layer, single-layer graphene film and metal electrode, wherein, the alumina insulating layer is plated in copper-based bottom
On transmission-type grating exit facet, the single-layer graphene film is covered on alumina insulating layer, and the metal electrode is plated in individual layer
On graphene film；Two latasutures are provided with the copper-based bottom transmission-type grating and a center seam, the center seam are located at
Copper-based bottom transmission-type grating center, two latasutures respectively be located at center seam both sides, and to the distance of center seam be l,
Set fluted on the copper-based bottom transmission-type grating exit facet, the groove is with periods lambdagEquidistantly it is uniformly distributed.
Compared with prior art, its remarkable advantage is the present invention：Tunable terahertz outside a kind of plane proposed by the invention
Hereby beam splitter model integrated degree is high, and working method is simple, and modulation efficiency is high, before having important application in the Terahertz communications field
Scape.
Brief description of the drawings
Fig. 1 is a kind of tunable Terahertz beam splitter structure schematic diagram of the present invention.
Fig. 2 is thz beam center operating frequency when being 3THZ, a kind of double light of tunable Terahertz beam splitter of the present invention
Beam modulates implementation result figure.Wherein scheme design sketch when (a) represents no graphene covering, figure (b)-(f) represents graphite respectively
Design sketch when alkene chemical potential is respectively 0.1eV, 0.3eV, 0.5eV, 0.7eV and 0.9eV.
Fig. 3 is thz beam center operating frequency when being 3THZ, a kind of tunable light of Terahertz beam splitter three of the present invention
Beam modulates implementation result figure.Wherein scheme design sketch when (a) represents no graphene covering, figure (b)-(f) represents graphite respectively
Design sketch when alkene chemical potential is respectively 0.1eV, 0.3eV, 0.5eV, 0.7eV and 0.9eV.
Fig. 4 is thz beam center operating frequency when being 2THZ, a kind of double light of tunable Terahertz beam splitter of the present invention
Beam and three beam modulation implementation result figures.Wherein scheme (a) and scheme the dual-beam that (b) represents that chemical potential is 0.1eV and 0.9eV respectively
Implementation result figure is modulated, figure (c) and figure (d) represent three beam modulation implementation results that chemical potential is 0.1eV and 0.9eV respectively
Figure.
Fig. 5 is thz beam center operating frequency when being 4THZ, a kind of double light of tunable Terahertz beam splitter of the present invention
Beam and three beam modulation implementation result figures.Wherein scheme (a) and scheme the dual-beam that (b) represents that chemical potential is 0.1eV and 0.9eV respectively
Implementation result figure is modulated, figure (c) and figure (d) represent three beam modulation implementation results that chemical potential is 0.1eV and 0.9eV respectively
Figure.
Embodiment
The present invention proposes a kind of tunable Terahertz beam splitter.
As shown in figure 1, the technical solution for realizing the object of the invention is：A kind of tunable Terahertz beam splitter, including
Copper-based bottom transmission-type grating 1, alumina insulating layer 2, single-layer graphene film 3 and metal electrode 4, wherein, alumina insulating layer 2
It is plated on the copper-based exit facet of bottom transmission-type grating 1, single-layer graphene film 3 is covered on alumina insulating layer 2, and metal electrode 4 plates
On single-layer graphene film 3；Two latasutures are provided with copper-based bottom transmission-type grating 1 and a center seam, center seam are located at
The copper-based center of bottom transmission-type grating 1, two latasutures respectively be located at center seam both sides, and to the distance of center seam be l, it is copper-based
Set fluted on the exit facet of bottom transmission-type grating 1, groove is with periods lambdagEquidistantly it is uniformly distributed.By metal electrode 4 with
And the copper-based both ends of bottom transmission-type grating 1 apply voltage to regulate and control the chemical potential of single-layer graphene, so as to realize to THz wave
Modulation.
The width of two latasutures is wsAnd latasuture width wsSpan be [0.12 λ, 0.16 λ], the width of center seam is
wcAnd center seam width wcSpan be [0.06 λ, 0.07 λ], the spacing l of center seam and latasuture span is [0.8
λ, 1.2 λ], λ is Terahertz incident light operation wavelength.Groove number is not less than 20, recess width wgAnd recess width wg's
Span is [0.08 λ, 0.12 λ], depth of groove tgAnd depth of groove tgSpan be [0.12 λ, 0.16 λ], groove
Cycle is ΛgAnd groove period ΛgSpan be [0.5 λ, 1.0 λ].The span of copper-based bottom transmission-type grating thickness is
[20μm,50μm].The span of alumina insulating layer thickness is [5nm, 30nm].The thickness of single-layer graphene is 1nm.
Tunable Terahertz beam splitter disclosed by the invention, by 1 liang of metal electrode 4 and copper-based bottom transmission-type grating
End applies voltage to regulate and control the chemical potential of single-layer graphene, so as to realize to Terahertz wave modulation.
Further detailed description is done to the present invention with reference to embodiment.
Embodiment 1
Thz beam center operating frequency is 3THz, and polarization type polarizes for TM.Copper-based bottom transmission-type grating thickness hCu
=36 μm, the width of center seam and latasuture is respectively wc=8 μm and ws=14 μm, l=93 μm of the spacing of center seam and latasuture, week
Phase property groove number 20, recess width wg=11 μm, depth of groove tg=14 μm, periods lambdag=65 μm.Single-layer graphene film
Chemical potential is adjusted to 0.9eV from 0.1eV.
By taking the present embodiment model as an example, by emulation obtain center operating frequency of the present invention be 3THZ it is a kind of it is tunable too
Hertz beam splitter dual-beam modulation implementation result.As shown in Fig. 2 when substrate grating is not covered with graphene, THz wave leads to
Dual-beam beam splitting effect can be produced by crossing diffraction, and after substrate grating is covered by single-layer graphene, with the chemistry of graphene
Gesture is adjusted to 0.9eV, dual-beam from 0.1eV to be gradually coupled into single beam.This dual-beam modulation phenomenon is in graphene chemistry
Gesture from 0.1eV change to 0.5eV when highly significant, gradually tend to saturation afterwards.
Embodiment 2
Thz beam working frequency is 3THz, and polarization type polarizes for TM.Copper-based bottom transmission-type grating thickness hCu=36 μ
The width of m, center seam and latasuture is respectively wc=8 μm and ws=14 μm, l=93 μm of the spacing of center seam and latasuture is periodically recessed
Slot number mesh 20, recess width wg=11 μm, depth of groove tg=14 μm, periods lambdag=85 μm.The chemical potential of single-layer graphene film
From 0.1eV regulations to 0.9eV.
By taking the present embodiment model as an example, by emulation obtain center operating frequency of the present invention be 3THZ it is a kind of it is tunable too
The hertz beam modulation implementation result of beam splitter three.As shown in figure 3, when substrate grating is not covered with graphene, THz wave leads to
Three beam splitter effects can be produced by crossing diffraction, and after substrate grating is covered by single-layer graphene, with the chemistry of graphene
Gesture is adjusted to 0.9eV, three light beams from 0.1eV to be gradually coupled into single beam.Likewise, this three beam modulations phenomenon is in graphite
Alkene chemical potential from 0.1eV change to 0.5eV when highly significant, tend to saturation afterwards.
Embodiment 3
Thz beam center operating frequency is 2THz, and polarization type polarizes for TM.Copper-based bottom transmission-type grating thickness hCu
=36 μm, the width of center seam and latasuture is respectively wc=12 μm and ws=21 μm, l=140 μm of the spacing of center seam and latasuture,
Periodic grooves number 20, recess width wg=16 μm, depth of groove tg=21 μm, periods lambdagRespectively 98 μm (dual-beam is adjusted
System) and 128 μm (three beam modulations).The chemical potential of single-layer graphene film is adjusted to 0.9eV from 0.1eV.
By taking the present embodiment model as an example, the tunable Terahertz that center operating frequency of the present invention is 2THZ is obtained by emulation
Beam splitter dual-beam and three beam modulation implementation results, as shown in Figure 4.From (a) and (b) in Fig. 4 as can be seen that working as the cycle
ΛgFor 98 μm when, when the chemical potential of graphene changes to 0.9eV from 0.1eV, Two-beam Coupling is into single beam.From Fig. 4
(c) and (d) is as can be seen that work as periods lambdagFor 128 μm when, when the chemical potential of graphene changes to 0.9eV, three light beams from 0.1eV
It is coupled into single beam.It is consistent with the effect of 3THZ embodiment.
Embodiment 4
Thz beam center operating frequency is 4THz, and polarization type polarizes for TM.Copper-based bottom transmission-type grating thickness hCu
=36 μm, the width of center seam and latasuture is respectively wc=6 μm and ws=10.5 μm, l=70 μm of the spacing of center seam and latasuture,
Periodic grooves number 20, recess width wg=8 μm, depth of groove tg=10.5 μm, when dual-beam is modulated, periods lambdagFor 49 μ
M, periods lambda during three beam modulationsgFor 64 μm.The chemical potential of single-layer graphene film is adjusted to 0.9eV from 0.1eV.
By taking the model of embodiment 4 as an example, the tunable Terahertz that center operating frequency of the present invention is 4THZ is obtained by emulation
Beam splitter dual-beam and three beam modulation implementation results, as shown in Figure 5.From (a) and (b) in Fig. 5 as can be seen that working as the cycle
ΛgFor 49 μm when, when the chemical potential of graphene changes to 0.9eV from 0.1eV, Two-beam Coupling is into single beam.From Fig. 5
(c) and (d) is as can be seen that work as periods lambdagFor 64 μm, the chemical potential of graphene from 0.1eV change to 0.9eV when, three light beam couplings
Synthesize single beam.It is consistent with the effect of 3THZ embodiment.
Embodiment 5
Thz beam working frequency is 3THz, and polarization type polarizes for TM.Copper-based bottom transmission-type grating thickness hCu=40 μ
The width of m, center seam and latasuture is respectively wc=0.065 λ and wsThe spacing l=0.9 λ of=0.13 λ, center seam and latasuture, cycle
Property groove number 20, recess width wg=0.09 λ, depth of groove tg=0.13 λ, periods lambdag=0.7 λ.Single-layer graphene film
Chemical potential is adjusted to 0.9eV from 0.1eV.
Embodiment 6
Thz beam working frequency is 3THz, and polarization type polarizes for TM.Copper-based bottom transmission-type grating thickness hCu=45 μ
The width of m, center seam and latasuture is respectively wc=0.067 λ and wsThe spacing l=1.0 λ of=0.15 λ, center seam and latasuture, cycle
Property groove number 20, recess width wg=0.1 λ, depth of groove tg=0.14 λ, periods lambdag=0.8 λ.The change of single-layer graphene film
Gesture is learned to adjust to 0.9eV from 0.1eV.
Embodiment 7
Thz beam working frequency is 3THz, and polarization type polarizes for TM.Copper-based bottom transmission-type grating thickness hCu=45 μ
The width of m, center seam and latasuture is respectively wc=0.067 λ and wsThe spacing l=1.0 λ of=0.15 λ, center seam and latasuture, cycle
Property groove number 25, recess width wg=0.08 λ, depth of groove tg=0.15 λ, periods lambdag=0.8 λ.Single-layer graphene film
Chemical potential is adjusted to 0.9eV from 0.1eV.
Embodiment 8
Thz beam working frequency is 3THz, and polarization type polarizes for TM.Copper-based bottom transmission-type grating thickness hCu=45 μ
The width of m, center seam and latasuture is respectively wc=0.068 λ and wsThe spacing l=1.1 λ of=0.15 λ, center seam and latasuture, cycle
Property groove number 25, recess width wg=0.08 λ, depth of groove tg=0.15 λ, periods lambdag=0.9 λ.Single-layer graphene film
Chemical potential is adjusted to 0.9eV from 0.1eV.
So as to which tunable Terahertz beam splitter proposed by the present invention is the thz beam control strip of the outer free space of plane
Carry out new technological means, working method is simple, and modulation efficiency is high, has in directions such as Terahertz communication, imaging and sensings potential
Application value.
Claims (6)
1. a kind of tunable Terahertz beam splitter, it is characterised in that including copper-based bottom transmission-type grating [1], alumina insulating layer
[2], single-layer graphene film [3] and metal electrode [4], wherein, the alumina insulating layer [2] is plated in copper-based bottom transmission-type light
On grid [1] exit facet, the single-layer graphene film [3] is covered on alumina insulating layer [2], and the metal electrode [4] is plated in
On single-layer graphene film [3]；Two latasutures and a center seam are provided with the copper-based bottom transmission-type grating [1], it is described
Center seam is located at copper-based bottom transmission-type grating [1] center, and two latasutures are located at the both sides of center seam respectively, and arrive center seam
Distance be l, set fluted on copper-based bottom transmission-type grating [1] exit facet, the groove is with periods lambdagEquidistantly
It is uniformly distributed.
2. tunable Terahertz beam splitter according to claim 1, it is characterised in that the width w of two latasuturess's
Span is [0.12 λ, 0.16 λ], the width w of the center seamcSpan be [0.06 λ, 0.07 λ], center seam and
The spacing l of latasuture span is [0.8 λ, 1.2 λ], and λ is Terahertz incident light operation wavelength.
3. tunable Terahertz beam splitter according to claim 1, it is characterised in that the groove number is not less than 20
It is individual, the recess width wgSpan be [0.08 λ, 0.12 λ], depth of groove tgSpan for [0.12 λ, 0.16
λ], groove period ΛgSpan be [0.5 λ, 1.0 λ].
4. tunable Terahertz beam splitter according to claim 1, it is characterised in that the copper-based bottom transmission-type grating
[1] span of thickness is [20 μm, 50 μm].
5. tunable Terahertz beam splitter according to claim 1, it is characterised in that the alumina insulating layer [2] is thick
The span of degree is [5nm, 30nm].
6. tunable Terahertz beam splitter according to claim 1, it is characterised in that the thickness of single-layer graphene [3] is
1nm。
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Application publication date: 20180116 |