CN106207326B - A kind of surface phasmon notch filter - Google Patents
A kind of surface phasmon notch filter Download PDFInfo
- Publication number
- CN106207326B CN106207326B CN201610816566.0A CN201610816566A CN106207326B CN 106207326 B CN106207326 B CN 106207326B CN 201610816566 A CN201610816566 A CN 201610816566A CN 106207326 B CN106207326 B CN 106207326B
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- China
- Prior art keywords
- surface phasmon
- metal
- metal tapes
- tapes
- slotted waveguide
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 72
- 239000002184 metal Substances 0.000 claims abstract description 70
- 239000003570 air Substances 0.000 claims description 9
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 9
- 239000010931 gold Substances 0.000 claims description 9
- 229910052737 gold Inorganic materials 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 239000011521 glass Substances 0.000 claims description 7
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 5
- 239000004411 aluminium Substances 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 239000004332 silver Substances 0.000 claims description 5
- 229910052709 silver Inorganic materials 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 238000003780 insertion Methods 0.000 abstract 1
- 230000037431 insertion Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000000411 transmission spectrum Methods 0.000 description 5
- 230000005684 electric field Effects 0.000 description 4
- 230000035515 penetration Effects 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 4
- 239000007769 metal material Substances 0.000 description 3
- 239000003989 dielectric material Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000002198 surface plasmon resonance spectroscopy Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/2016—Slot line filters; Fin line filters
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
A kind of surface phasmon notch filter, is related to surface phasmon.Equipped with surface phasmon slotted waveguide and at least two cuboid resonant cavities, in at least two cuboids resonant cavity insertion surface phasmon slotted waveguide, the surface phasmon slotted waveguide is equipped with metal film and two metal tapes, two metal tapes are equipped with metal film upper surface, two metal tapes are parallel to each other, two metal tapes it is of same size, the height of two metal tapes is identical, for surface phasmon slotted waveguide in addition to metal film and two metal tapes, other parts are air or medium.Realize that surface phasmon filters using the wavelength selectivity of dielectric cavity resonance.Not only there is good wavelength blocking property to surface phasmon, and flexible design, structure are simple, scale is small, and it is at low cost, it is easily worked, is very suitable to integrate.
Description
Technical field
The present invention relates to surface phasmons, more particularly, to a kind of surface phasmon notch filter.
Background technique
Surface phasmon (Surface Plasmon Polariton) is a kind of electricity of local on medium/metal surface
Magnetic field surface modes, its main feature is that electromagnetic field intensity exponential damping on the direction perpendicular to metal surface；And it is situated between with being greater than
The wave number of same frequency photon is propagated along metal surface in matter.Under certain condition, it may be implemented between light and surface phasmon
Energy conversion.This people can use surface phasmon to grasp light in the range of micron or even nanoscale
Control.The research and correlation theory research of various function elements based on surface phasmon become hot spot in recent years, attract
The concern of numerous scientific research personnel.
Due to surface phasmon have biggish transmission loss, according to traditional Filter Principle come design surface etc. from
Excimer filter will lead to that device performance is not high, and can not obtain the device of small scale.Therefore, it is necessary to according to surface phasmon
The characteristics of carry out design and implementation filter, this always be realize surface phasmon filter difficult point.([1]W.L.Barnes,
A.Dereux,and T.W.Ebbesen,“Surface plasmon subwavelength optics,”Nature 424,
824–830(2003))。
Summary of the invention
The purpose of the present invention is to provide a kind of surface phasmon notch filters.
The present invention is equipped with surface phasmon slotted waveguide and at least two cuboid resonant cavities, and described at least two is rectangular
Resonance body chamber is embedded in surface phasmon slotted waveguide, and the surface phasmon slotted waveguide is equipped with metal film and two gold
Belong to band, two metal tapes are equipped with metal film upper surface, and two metal tapes are parallel to each other, two metal tapes it is of same size,
The height of two metal tapes is identical, and in addition to metal film and two metal tapes, other parts are surface phasmon slotted waveguide
Air or medium.
The cross section of the surface phasmon slotted waveguide is open rectangle chamber, and the width of two metal tapes can be 0.6 μ
M, the height of two metal tapes can be 0.8 μm, and the spacing of two metal tapes can be 0.5 μm.
The material of the metal tape is unlimited, can be selected from one of gold, silver, aluminium etc.；The material of the medium is unlimited, optional
From one kind of air, glass, water etc., as long as the propagation of the wave band energy support surface phasmon in needs.Metal film
The width of thickness and metal tape and height do not limit strictly, visual concrete condition adjusting and optimizing, generally higher than surface phasmon
Penetration depth in a metal.
It can be scattered by resonant cavity when surface phasmon transmits in slotted waveguide, the surface phasmon of specific wavelength
Transmission Shuaigu is formed after resonant cavity.Position, number, depth and the half-breadth of paddy and geometric dimension, the arrangement mode of chamber etc. have
It closes.By the size, number and spacing of adjusting cavity, the surface phasmon trap with single or multiple trap bands may be implemented
Filter.
Metal and dielectric material do not limit in the present invention, can be gold, silver, aluminium and air, glass, water etc. respectively, as long as
In the propagation of the wave band energy support surface phasmon of needs.The thickness of metal film and the width of metal tape and height be not tight
Lattice limitation, visual concrete condition adjusting and optimizing, the generally higher than penetration depth of surface phasmon in a metal.
The advantage of the invention is that realizing that surface phasmon filters using the wavelength selectivity of dielectric cavity resonance.This knot
Structure not only has good wavelength blocking property to surface phasmon, and flexible design, structure are simple, and scale is small, at low cost,
It is easily worked, is very suitable to integrate.
Detailed description of the invention
Fig. 1 is the metal groove profile waveguiding structure schematic diagram in the present invention；
Fig. 2 is surface phasmon electric field of the fundamental mode distribution map in metal slotted waveguide of the invention；
Fig. 3 is the structural schematic diagram of one notch filter of the embodiment of the present invention；
Fig. 4 is the generation of the embodiment of the present invention one through spectrum (L=0.9 μm, D=0.4 μm)；
Fig. 5 is the generation of the embodiment of the present invention one through spectrum (L=1.4 μm, D=0.7 μm)；
Fig. 6 is the structural schematic diagram of two notch filter of the embodiment of the present invention；
Fig. 7 be the embodiment of the present invention two generate through spectrum (L1=L2=0.9 μm, D1=D2=0.4 μm, S=1.0 μ
m)；
Fig. 8 be the embodiment of the present invention two generate through spectrum (L1=L2=0.9 μm, D1=0.4 μm, D2=0.45 μm, S
=1.0 μm).
Specific embodiment
Of the invention is described in further detail in the following with reference to the drawings and specific embodiments.
Referring to Fig. 1~6, the embodiment of the present invention is equipped with surface phasmon slotted waveguide and at least two cuboid resonant cavities
3, at least two cuboids resonant cavity 3 is embedded in surface phasmon slotted waveguide, the surface phasmon groove profile wave
It leads and is equipped with metal film 1 and two metal tapes 2, two metal tapes 2 are equipped with 1 upper surface of metal film, and two metal tapes 2 are mutually flat
Row, two metal tapes 2 it is of same size, the height of two metal tapes 2 is identical, surface phasmon slotted waveguide except metal film and
Other than two metal tapes, other parts are air or medium.
The cross section of the surface phasmon slotted waveguide is open rectangle chamber, and the width G of two metal tapes 2 can be
0.6 μm, the height H of two metal tapes 2 can be 0.8 μm, and the spacing W of two metal tapes 2 can be 0.5 μm.
The material of the metal tape is unlimited, can be selected from one of gold, silver, aluminium etc.；The material of the medium is unlimited, optional
From one kind of air, glass, water etc., as long as the propagation of the wave band energy support surface phasmon in needs.Metal film
The width of thickness and metal tape and height do not limit strictly, visual concrete condition adjusting and optimizing, generally higher than surface phasmon
Penetration depth in a metal.
The characteristic and metal material of surface phasmon filter of the invention, surface phasmon frequency, waveguide it is several
What size, the geometric dimension of dielectric cavity and arrangement mode are related.By solving maxwell equation group and boundary condition or use
Electromagnetic Calculation software (finite element, FDTD etc.) can acquire transmission spectrum.
The cross section of the surface phasmon slotted waveguide is an open rectangle chamber.This waveguide energy support surface etc.
Propagation from excimer, Fig. 2 provide surface phasmon in a slotted waveguide (W=0.5 μm, G=0.6 μm, H=0.8 μm)
Vacuum wavelength is the transverse electric field distribution of the basic mode of 900nm, it is seen that energy is mainly bound in the bottom of waveguide.By in groove profile
It is embedded in surface plasmon resonance chamber 3 in the metal tape of waveguide and is formed notch filter of the invention (see Fig. 3).Resonant cavity
Length is L, depth D, highly with metal tape height.Fig. 3 only depicts two symmetrical resonant cavities, multiple total in practical application
Vibration chamber can connect.
It can be scattered by resonant cavity when surface phasmon transmits in slotted waveguide, the surface phasmon of specific wavelength
Transmission Shuaigu is formed after resonant cavity.Position, number, depth and the half-breadth of paddy and geometric dimension, the arrangement mode of chamber etc. have
It closes.By the size, number and spacing of adjusting cavity, the surface phasmon trap with single or multiple trap bands may be implemented
Filter.
Metal and dielectric material do not limit in the present invention, can be gold, silver, aluminium and air, glass, water etc. respectively, as long as
In the propagation of the wave band energy support surface phasmon of needs.The thickness of metal film and the width of metal tape and height be not tight
Lattice limitation, visual concrete condition adjusting and optimizing, the generally higher than penetration depth of surface phasmon in a metal.
Specific embodiment is given below.
Embodiment one
Fig. 3 provides the structural schematic diagram of one notch filter of the embodiment of the present invention.The material of waveguide be gold, golden film with a thickness of
400nm, metal tape width G=1.0 μm, H=1.8 μm of height, W=1.6 μm of duct width.L=0.9 μm of the length of chamber, depth D
=0.4 μm.Filter is placed on a glass substrate, remaining medium is air.The surface phasmon of numerical simulation passes through medium
Intensity (electric field square) transmission spectrum after chamber is shown in that Fig. 4, abscissa are the vacuum wavelengths of incidence surface phasmon.At 1.34 μm
Transmissivity is down to 0.17 suddenly, that is, realizes notch filter.Resistance band (half-breadth) is 30nm.
The size of cavity is adjusted, can realize the filter having there are two trap band.Such as when L=1.0 μm, D=0.7
μm when, transmission spectrum is shown in Fig. 5, and transmissivity is down to 0.16 and 0.15 suddenly at 1.25 μm and 1.67 μm of central wavelength.Resistance band point
Other 34nm and 73nm.
Embodiment two
The series connection that can use multiple resonant cavities further enhances filtering performance.Fig. 6 provides two trap of the embodiment of the present invention
The structural schematic diagram of filter.The dielectric cavity of the structure of comparative example 1, the same size for being divided into S between introducing two pairs makes filter
With deeper transmission valley.For example, golden film is with a thickness of 400nm, metal tape width G=1.0 μm when the material of waveguide is gold,
H=1.8 μm of height, W=1.6 μm of duct width.Two L1=L2=0.9 μm of cavity lengths, are spaced S=by D1=D2=0.4 μm of depth
1.0μm.Filter is placed on a glass substrate, remaining medium is air.Intensity (electricity of the surface phasmon after dielectric cavity
Square) transmission spectrum is shown in Fig. 7.It is further in identical stopband position (at 1.34 μm) transmissivity compared with Fig. 4 of embodiment 1
It is down to 0.08.Resistance band is 41nm.
If the size of two chambers is different, the size by adjusting cavity can change the bandwidth of trap.For example, when waveguide
Material is gold, and golden film is with a thickness of 400nm, metal tape width G=1.0 μm, H=1.8 μm of height, W=1.6 μm of duct width.Two
L1=L2=0.9 μm of cavity length, 1=0.4 μm of width D, 2=0.45 μm of S=1.0 μm of interval of width D, the medium of surrounding is empty
Gas.Intensity (electric field square) transmission spectrum of the surface phasmon of numerical simulation after dielectric cavity is shown in Fig. 8, in 1.33 and 1.37
μ m internal transmission factor all only has 0.12 or less.Resistance band increases to 58nm.
Claims (5)
1. a kind of surface phasmon notch filter, it is characterised in that be equipped with surface phasmon slotted waveguide and at least two
Cuboid resonant cavity, the surface phasmon slotted waveguide are equipped with metal film and two metal tapes, and described at least two is rectangular
Resonance body chamber is embedded in two metal tapes of surface phasmon slotted waveguide, and two metal tapes are located at table on metal film
Face, two metal tapes are parallel to each other, two metal tapes it is of same size, the height of two metal tapes is identical, surface phasmon
For slotted waveguide in addition to metal film and two metal tapes, other parts are air or medium.
2. a kind of surface phasmon notch filter as described in claim 1, it is characterised in that the surface phasmon slot
The cross section of type waveguide is open rectangle chamber.
3. a kind of surface phasmon notch filter as described in claim 1, it is characterised in that the width of two metal tapes
Degree is 0.6 μm, and the height of two metal tapes is 0.8 μm, and the spacing of two metal tapes is 0.5 μm.
4. a kind of surface phasmon notch filter as described in claim 1, it is characterised in that the material of the metal tape selects
From one of gold, silver, aluminium.
5. a kind of surface phasmon notch filter as described in claim 1, it is characterised in that the material of the medium is selected from
One kind of air, glass, water.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610816566.0A CN106207326B (en) | 2016-09-12 | 2016-09-12 | A kind of surface phasmon notch filter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610816566.0A CN106207326B (en) | 2016-09-12 | 2016-09-12 | A kind of surface phasmon notch filter |
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| CN106207326A CN106207326A (en) | 2016-12-07 |
| CN106207326B true CN106207326B (en) | 2019-05-10 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107167874B (en) * | 2017-06-13 | 2019-11-22 | 中国科学技术大学 | Acceptor of energy |
| CN107959224B (en) * | 2018-01-04 | 2023-06-20 | 华侨大学 | Surface plasmon laser based on metal cavity |
| CN111384553A (en) * | 2018-12-29 | 2020-07-07 | 深圳市大富科技股份有限公司 | Filter and communication equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105280996A (en) * | 2015-10-08 | 2016-01-27 | 中国矿业大学 | Artificial surface plasmon broadband bandstop filter based on composite U-shaped groove structure |
| CN105811055A (en) * | 2016-05-20 | 2016-07-27 | 厦门大学 | Surface plasmon filter |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105334573A (en) * | 2014-06-20 | 2016-02-17 | 北京三星通信技术研究有限公司 | Surface plasmon waveguide |
| CN104597564B (en) * | 2015-01-16 | 2018-03-30 | 哈尔滨工业大学深圳研究生院 | The compound narrow slit wave-guide of one species surface plasma and its application |
| CN104993194A (en) * | 2015-06-24 | 2015-10-21 | 上海理工大学 | Terahertz wave band elimination filtering device |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105280996A (en) * | 2015-10-08 | 2016-01-27 | 中国矿业大学 | Artificial surface plasmon broadband bandstop filter based on composite U-shaped groove structure |
| CN105811055A (en) * | 2016-05-20 | 2016-07-27 | 厦门大学 | Surface plasmon filter |
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