CN108363126A - A kind of unrelated wide angle graphene absorber of polarization - Google Patents
A kind of unrelated wide angle graphene absorber of polarization Download PDFInfo
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- CN108363126A CN108363126A CN201810156239.6A CN201810156239A CN108363126A CN 108363126 A CN108363126 A CN 108363126A CN 201810156239 A CN201810156239 A CN 201810156239A CN 108363126 A CN108363126 A CN 108363126A
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/003—Light absorbing elements
Abstract
The invention discloses a kind of unrelated wide angle graphene absorbers of polarization, the graphene absorber includes the multi-layer grating ridge of metallic substrates and setting on the metallic substrate, and multi-layer grating ridge is the optical grating construction that the upper graphene layer being sequentially stacked from top to bottom, upper dielectric layer, lower graphene layer and lower dielectric layer are constituted；Upper graphene layer, upper dielectric layer, lower graphene layer and lower dielectric layer are the identical rectangle sheet body of length and width, and the thickness of upper graphene layer is identical with the thickness of lower graphene layer and is less than the thickness of upper dielectric layer；The thickness of lower dielectric layer is more than the thickness of upper dielectric layer；When normal incident light is incident on TE polarization modes on multi-layer grating ridge, multi-layer grating ridge generates chamber mode resonance with multi-layer grating ridge, metallic substrates interaction, light absorption is caused to enhance as a resonant cavity, incident light；When normal incident light is incident on TM polarization modes on multi-layer grating ridge, incident light generates magnetic resonance in the interface of underlying dielectric layer and metallic substrates.
Description
Technical field
The invention belongs to the design fields of electromagnetic wave absorber, especially for the insensitive graphite of the polarization state of incident light
Alkene absorber, specifically a kind of unrelated wide angle graphene absorber of polarization.
Background technology
It is well known that electromagnetic wave absorber can receive electromagnetic wave.It is this to have in order to effectively utilize electromagnetic wave
The optical device of important application background comes into being.Currently, the selection absorbability of traditional Intrinsic Gettering is very poor, absorptivity is extremely low,
And it is very strong to the dependence of material.And multiple-beam interference absorbs, absorption band extremely sensitive to the variation of incident angle and polarization
It is wide very narrow, and the thickness of structure is quarter-wave integral multiple, it is usually all bigger.As contemporary optics detects skill
Art is constantly progressive, and on-line dynamic measurement, real-time monitoring processing can be carried out by not requiring nothing more than device in system operation, and
The device for also requiring the geometric dimension of device small as far as possible therefore traditional has been unable to meet the development of the prior art.
Invention content
The technical problem to be solved by the present invention is to present situations for the above-mentioned prior art, and provide it is simple in structure, small,
It is easy to make and with the unrelated wide angle of a kind of polarization for polarizing unrelated, wide-angle range, broad absorption band and high-absorbility characteristic
Spend graphene absorber.
Technical solution is used by the present invention solves above-mentioned technical problem：
A kind of unrelated wide angle graphene absorber of polarization, the graphene absorber include metallic substrates and are arranged in the metal
Multi-layer grating ridge in substrate, multi-layer grating ridge are the upper graphene layer, upper dielectric layer, lower graphite being sequentially stacked from top to bottom
The optical grating construction that alkene layer and lower dielectric layer are constituted；Upper graphene layer, upper dielectric layer, lower graphene layer and lower dielectric layer are equal
For the identical rectangle sheet body of length and width, and the thickness of upper graphene layer is identical with the thickness of lower graphene layer and less than powering on Jie
The thickness of matter layer；The thickness of lower dielectric layer is more than the thickness of upper dielectric layer；When normal incident light is incident on TE polarization modes
When on multi-layer grating ridge, multi-layer grating ridge is produced as a resonant cavity, incident light with multi-layer grating ridge, metallic substrates interaction
Raw chamber mode resonance, causes light absorption to enhance；When normal incident light is incident on TM polarization modes on multi-layer grating ridge, incident light
Magnetic resonance is generated in the interface of underlying dielectric layer and metallic substrates.
To optimize above-mentioned technical proposal, the concrete measure taken further includes：
Above-mentioned metallic substrates are metallic Gold material or the strong reflection metal layer made of metallic Silver material.
Above-mentioned upper dielectric layer and lower dielectric layer is by germanium material or the high refractive index medium being fabricated from a silicon
Layer.
The thickness of above-mentioned upper dielectric layer is 50nm-100nm, and the thickness of lower dielectric layer is 100nm-150nm.
The period of above-mentioned multi-layer grating ridge is 800nm-2000nm, and the duty ratio of multi-layer grating ridge is 0.4-0.6.
When the incidence angle of above-mentioned incident light changes in the range of 0 ° -80 °, absorption of the graphene absorber to incident light
Rate is 80%-99%, and insensitive for the polarization state of incident light.
Above-mentioned graphene absorber is that one kind being based on sub-wave length grating graphene absorber, and the wave-length coverage of incident light is
2μm-4μm。
Compared with prior art, the unrelated wide angle graphene absorber of polarization of the invention is a kind of based on sub-wavelength light
The graphene absorber of grid structure, the present invention have the following advantages compared with conventional suction device:
1, grating is designed using graphene, size is small, stable optical performance.
2, efficiency of light absorption is high, can reach 80% or more, maximum reachable 99%.
3, graphene absorber polarization is unrelated, is suitable for broad-angle-incident.
4, this system is compact-sized, easily controllable and adjusting, and system stability is high.
Description of the drawings
Fig. 1 is the structure diagram of the present invention；
Fig. 2 is abosrption spectrogram of the present invention under two kinds of polarization states of TE and TM；
Fig. 3 is the relational graph of absorption spectrum and angle of light of the present invention under TE polarization states；
Fig. 4 is the relational graph of absorption spectrum and angle of light of the present invention under TM polarization states；
Fig. 5 is the relational graph of the present invention absorption spectrum under TE polarization states and angle of light, lambda1-wavelength；
Fig. 6 is the relational graph of the present invention absorption spectrum under TM polarization states and angle of light, lambda1-wavelength.
Specific implementation mode
The embodiment of the present invention is described in further detail below in conjunction with attached drawing.
Reference numeral therein is：Metallic substrates 1, multi-layer grating ridge 2, upper graphene layer 21, upper dielectric layer 22, lower stone
Black alkene layer 23, lower dielectric layer 24.
Embodiment one, as shown in Figures 1 to 6, a kind of unrelated wide angle graphene absorber of polarization of the invention be one kind
The wave-length coverage of graphene absorber based on sub-wavelength grate structure, incident light is 2 μm -4 μm.The graphene absorber includes
Metallic substrates 1 and setting multi-layer grating ridge 2 on the metallic substrate, multi-layer grating ridge 2 be sequentially stacked from top to bottom it is upper
The optical grating construction that graphene layer 1, upper dielectric layer 22, lower graphene layer 23 and lower dielectric layer 24 are constituted；Upper graphene layer 21,
Upper dielectric layer 22, lower graphene layer 23 and lower dielectric layer 24 are the identical rectangle sheet body of length and width, and upper graphene
The thickness of layer 21 is identical with the thickness of lower graphene layer 23, and the thickness of the thickness of upper graphene layer 21 and lower graphene layer 23 is less than
The thickness of upper dielectric layer 22；The thickness of lower dielectric layer 24 is more than the thickness of upper dielectric layer 22；Metallic substrates 1 are strong reflection
Metal layer is made of metallic Gold material, can also be made of metallic Silver material.Upper dielectric layer 22 and lower dielectric layer 24 are
High refractive index medium layer, upper dielectric layer 22 and lower dielectric layer 24 are all made of germanium material, or are fabricated from a silicon.It powers on
The thickness of dielectric layer 22 is 50nm-100nm, and the thickness of lower dielectric layer 24 is 100nm-150nm.The period of multi-layer grating ridge 2
Duty ratio for 800nm-2000nm, multi-layer grating ridge 2 is 0.4-0.6.The incidence angle of incident light becomes in the range of 0 ° -80 °
When change, graphene absorber is 80%-99% to the absorptivity of incident light, and insensitive for the polarization state of incident light.
The operation principle of the present invention is that：When normal incident light is incident on two kinds of polarization modes of TE and TM on multi-layer grating ridge 2
When, it resonates at the different location of optical grating construction respectively, to generate the phenomenon that light absorption enhances.When normal incident light is with TE
When polarization mode is incident on multi-layer grating ridge 2, multi-layer grating ridge 2 is used as a resonant cavity, metallic substrates 1 to have as substrate
Strong reflection, incident light generate chamber mode resonance with multi-layer grating ridge 2, the interaction of metallic substrates 1, light absorption are caused to enhance；When
When normal incident light is incident on TM polarization modes on multi-layer grating ridge 2, incident light is in underlying dielectric layer 24 and metallic substrates 1
Interface generates magnetic resonance.
Embodiment two
A kind of unrelated wide angle graphene absorber of polarization of the present invention, basic structure are followed successively by graphene layer from top to bottom
21, upper dielectric layer 22, lower graphene layer 23, lower dielectric layer 24 and metallic substrates 1.Metallic substrates 1 are golden material, Jin Shi
There are the material of strong reflection, upper graphene layer 21, upper dielectric layer 22, lower graphene layer 23 and the composition setting of lower dielectric layer 24
Multi-layer grating ridge 2 in the metallic substrates 1 of golden material.The thickness of upper graphene layer 21 and lower graphene layer 23 is 3.4
Nm, upper dielectric layer 22 and lower dielectric layer 24 are that the material with high refractive index medium is made, and material is germanium (Ge), on
The thickness of dielectric layer 22 is 50 nm, and the thickness of lower dielectric layer 24 is 100 nm, and the period of multi-layer grating ridge 2 is 800 nm,
Its duty ratio is 0.4.The unrelated wide angle graphene absorber of polarization provided by the present invention is a kind of based on sub-wave length grating knot
The graphene absorber of structure, in very wide ranges of incidence angles（0 ~ 80 ° or more）Keep higher absorptivity（80% or more, most
99% can be reached greatly）, and it is insensitive for the polarization state of incident light.
The present invention its basic principle be：When normal incident light is incident on two kinds of polarization modes of TE and TM on grating, point
It does not resonate at the different location of optical grating construction, to generate the phenomenon that light absorption enhances.It is polarized in TE, upper stone
Black alkene layer 21, upper dielectric layer 22, lower graphene layer 23, lower dielectric layer 24 are used as a resonant cavity, metallic substrates 1 to be used as base
Bottom has strong reflection, light-matter interaction to generate chamber mode resonance, light absorption is caused to enhance.It is polarized in TM, just
Incident light generates magnetic resonance in the interface of lower dielectric and metallic substrates 1.
Not described part is identical as embodiment one in the present embodiment.
Embodiment three
A kind of unrelated wide angle graphene absorber of polarization of the present invention of the present invention, basic structure are followed successively by from top to bottom
Graphene layer 21, upper dielectric layer 22, lower graphene layer 23, lower dielectric layer 24 and metallic substrates 1.Metallic substrates 1 are silver
Material, silver are the material for having strong reflection, upper graphene layer 21, upper dielectric layer 22, lower graphene layer 23 and lower dielectric layer
The multi-layer grating ridge 2 that 24 compositions are arranged in the metallic substrates 1 of golden material.The thickness of upper graphene layer 21 and lower graphene layer 23
It is 3.4 nm, upper dielectric layer 22 and lower dielectric layer 24 are that the material with high refractive index medium is made, and material is
The thickness of silicon (Si), upper dielectric layer 22 is 100 nm, and the thickness of lower dielectric layer 24 is 150 nm, the week of multi-layer grating ridge 2
Phase is 2000 nm, duty ratio 0.6.
Not described part is identical as embodiment one in the present embodiment.
Fig. 2 is the absorption light of the TE and TM polarised lights of the unrelated wide angle graphene absorber of polarization designed by the present invention
The relational graph of spectrum and incident wavelength.Figure it is seen that in the wave-length coverage entirely considered（2~4 μm）, light normal incidence
In the case of, when light is that TE is polarized, the absorptivity of graphene absorber of the invention can reach 82.3%, when light polarizes for TM
When, the absorptivity of graphene absorber can reach 93.5%.In the case of TE polarizations, the full width at half maximum (FWHM) of absorption spectra（FWHM）For
1.05 μm, in the case of TM is polarized, the full width at half maximum (FWHM) of absorption spectra（FWHM）It is 0.59 μm.
Fig. 3 be the TE polarised lights of the unrelated wide angle graphene absorber of polarization designed by the present invention absorption spectrum with
The relational graph of incident angle.A length of 2.9 μm of incident light wave, from figure 3, it can be seen that angle of light increases to always 80 degree from 0 degree
During, absorptivity keeps 80% or more under TE polarization states, and maximum absorbance can reach 99% under a certain angle.When entering
After firing angle is more than 80 degree, absorptivity can drastically decline.
Fig. 4 be the TM polarised lights of the unrelated wide angle graphene absorber of polarization designed by the present invention absorption spectrum with
The relational graph of incident angle.A length of 2.9 μm of incident light wave, from fig. 4, it can be seen that angle of light increases to always 80 degree from 0 degree
During, absorptivity keeps 90% or more under TM polarization states, and maximum absorbance can reach 99.9% under a certain angle.When
After incidence angle is more than 80 degree, absorptivity can drastically decline.
Fig. 5 be the TE polarised lights of the unrelated wide angle graphene absorber of polarization designed by the present invention absorption spectrum with
The relational graph of lambda1-wavelength, angle of light.From fig. 5, it can be seen that with the variation of angle of light, institute is right at formant
It should be that optical wavelength is held essentially constant, be 2.9 μm.When angle of light reaches 60 °, the absorption peak under TE polarizations can reach
99%, form the unrelated nearly perfect absorption of polarization.
Fig. 6 is the absorption spectrum and incident wavelength, the relationship of incident angle of the TM polarised lights of graphene absorber of the present invention
Figure.From fig. 6, it can be seen that with the variation of angle of light, it is that optical wavelength remains unchanged to be corresponded at formant, is 2.9 μ
m.When incidence angle reaches 60 °, the absorptivity maximum under TM polarizations can reach 99.9%, form the unrelated nearly perfect absorption of polarization.
It can thus be seen that the present invention is in very wide ranges of incidence angles（0-80 ° or more）Keep very high absorptivity
（80% or more, maximum can reach 99.9%）, and it is insensitive for the polarization state of incident light.
The above, the only preferred embodiment for the present invention, but the scope of the present invention is not limited thereto, it is any to be familiar with
In the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in should all be covered those skilled in the art
In in the scope of the present invention.
Claims (7)
1. a kind of unrelated wide angle graphene absorber of polarization, the graphene absorber include metallic substrates (1) and set
The multi-layer grating ridge (2) in the metallic substrates is set, it is characterized in that：The multi-layer grating ridge (2) is to fold successively from top to bottom
The grating knot that upper graphene layer (21), upper dielectric layer (22), lower graphene layer (23) and the lower dielectric layer (24) set are constituted
Structure；Upper graphene layer (21), upper dielectric layer (22), lower graphene layer (23) and the lower dielectric layer (24) is length and width
Identical rectangle sheet body, and the thickness of the upper graphene layer (21) is identical with the thickness of lower graphene layer (23), and
Less than the thickness of upper dielectric layer (22)；The thickness of the lower dielectric layer (24) is more than the thickness of the upper dielectric layer (22)
Degree；When normal incident light is incident on TE polarization modes on multi-layer grating ridge (2), the multi-layer grating ridge (2) is used as one
Resonant cavity, incident light generate chamber mode resonance with multi-layer grating ridge (2), metallic substrates (1) interaction, light absorption are caused to increase
By force；When normal incident light is incident on TM polarization modes on multi-layer grating ridge (2), incident light is in underlying dielectric layer (24) and gold
The interface for belonging to substrate (1) generates magnetic resonance.
2. a kind of unrelated wide angle graphene absorber of polarization according to claim 1, it is characterized in that：The Metal Substrate
Bottom (1) is metallic Gold material or the strong reflection metal layer made of metallic Silver material.
3. a kind of unrelated wide angle graphene absorber of polarization according to claim 2, it is characterized in that：Described powers on Jie
Matter layer (22) and lower dielectric layer (24) are by germanium material or the high refractive index medium layer being fabricated from a silicon.
4. a kind of unrelated wide angle graphene absorber of polarization according to claim 3, it is characterized in that：Described powers on Jie
The thickness of matter layer (22) is 50nm-100nm, and the thickness of the lower dielectric layer (24) is 100nm-150nm.
5. a kind of unrelated wide angle graphene absorber of polarization according to claim 4, it is characterized in that：The multilayer optical
The period of grid ridge (2) is 800nm-2000nm, and the duty ratio of multi-layer grating ridge (2) is 0.4-0.6.
6. a kind of unrelated wide angle graphene absorber of polarization according to claim 5, it is characterized in that：The incident light
Incidence angle when changing in the range of 0 ° -80 °, the graphene absorber is 80%-99% to the absorptivity of incident light, and
It is insensitive for the polarization state of incident light.
7. a kind of unrelated wide angle graphene absorber of polarization according to claim 6, it is characterized in that：The graphene
Absorber is that one kind being based on sub-wave length grating graphene absorber, and the wave-length coverage of the incident light is 2 μm -4 μm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810156239.6A CN108363126A (en) | 2018-02-24 | 2018-02-24 | A kind of unrelated wide angle graphene absorber of polarization |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810156239.6A CN108363126A (en) | 2018-02-24 | 2018-02-24 | A kind of unrelated wide angle graphene absorber of polarization |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109586042A (en) * | 2018-12-03 | 2019-04-05 | 中国科学技术大学 | A kind of wave absorbing device and preparation method thereof |
| CN110780369A (en) * | 2019-11-05 | 2020-02-11 | 常州工业职业技术学院 | Visible light all-band absorber based on graphene and one-dimensional photonic crystal composite structure |
Citations (2)
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|---|---|---|---|---|
| CN105338798A (en) * | 2015-11-24 | 2016-02-17 | 黄山学院 | Infrared band adjustable dual-frequency/tri-frequency graphene metamaterial absorption device and application method thereof |
| CN105652354A (en) * | 2016-01-25 | 2016-06-08 | 中国科学院上海光学精密机械研究所 | Polarization-independent broadband absorber based on conical metal-dielectric multilayer grating structure |
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2018
- 2018-02-24 CN CN201810156239.6A patent/CN108363126A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105338798A (en) * | 2015-11-24 | 2016-02-17 | 黄山学院 | Infrared band adjustable dual-frequency/tri-frequency graphene metamaterial absorption device and application method thereof |
| CN105652354A (en) * | 2016-01-25 | 2016-06-08 | 中国科学院上海光学精密机械研究所 | Polarization-independent broadband absorber based on conical metal-dielectric multilayer grating structure |
Non-Patent Citations (1)
| Title |
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| XIUJUAN ZOU: "Polarization-insensitive and wide-incident-angle optical absorber with periodically patterned", 《OPTICS LETTERS》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109586042A (en) * | 2018-12-03 | 2019-04-05 | 中国科学技术大学 | A kind of wave absorbing device and preparation method thereof |
| CN109586042B (en) * | 2018-12-03 | 2020-08-28 | 中国科学技术大学 | Wave absorber and preparation method thereof |
| CN110780369A (en) * | 2019-11-05 | 2020-02-11 | 常州工业职业技术学院 | Visible light all-band absorber based on graphene and one-dimensional photonic crystal composite structure |
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