CN107315204A - Ultra-thin surfaces ripple photonic crystal - Google Patents
Ultra-thin surfaces ripple photonic crystal Download PDFInfo
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- CN107315204A CN107315204A CN201710373960.6A CN201710373960A CN107315204A CN 107315204 A CN107315204 A CN 107315204A CN 201710373960 A CN201710373960 A CN 201710373960A CN 107315204 A CN107315204 A CN 107315204A
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- photonic crystal
- sheet metal
- thin
- ripple
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/002—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of materials engineered to provide properties not available in nature, e.g. metamaterials
- G02B1/005—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of materials engineered to provide properties not available in nature, e.g. metamaterials made of photonic crystals or photonic band gap materials
Abstract
The invention discloses a kind of ultra-thin surfaces ripple photonic crystal, the sheet metal that two-dimensional and periodic is distributed on metal base plate is constituted, and sheet metal is linked together by metal column with the metal base plate, filled media between the sheet metal and the metal base plate.Defect is introduced on described ultra-thin surfaces ripple photonic crystal so that the resonant frequency of the fault location, which is within the forbidden band of ultra-thin surfaces ripple photonic crystal around, may make up a series of function elements.The surface photon crystal is the surface wave forbidden photon band produced based on particular resonance, so the cycle of the novel surface photonic crystal is far smaller than wavelength, has important application for microwave and THz devices miniaturization.
Description
Technical field
The invention belongs to photonic crystal field, and in particular to a kind of ultra-thin surfaces ripple photonic crystal.
Background technology
Photonic crystal refers to the artificial periodicity with photon band gap (Photonic Band-Gap, referred to as PBG) characteristic
The electromagnetic wave that dielectric medium structure, i.e. frequency fall in photon band gap is forbidden propagating.By introducing defect in the photonic crystal,
Electromagnetic wave can be constrained in defect and propagate, so as to reach the purpose of control Electromagnetic Wave Propagation.In large-scale integrated optical circuit
In have important application prospect.
Surface plasma excimer (Surface Plasmon Polariton, SPP) is a kind of along conductor and medium friendship
Interface transmission, along in the vertical direction of interface rapid decay surface electromagnetic wave, it has extensive in sub-wavelength integrated optics field
Research and application.And artificial surface plasmon (spoof SPP) be it is a kind of low-frequency band (microwave, Terahertz or
Far infrared) possess the dispersion curve similar with SPP, the surface electromagnetic wave transmitted in metal period surface structure.Artificial surface
Plasma can break through diffraction limit, and electromagnetic wave is constrained in the range of sub-wavelength and propagated, so as to reach in sub-wavelength dimensions model
Enclose the purpose of interior control electromagnetic transmission.
Conventional photonic crystals are what the principle based on Bragg diffraction was formed, so its size is wavelength magnitude, this
The size that sample will result in photon crystal device is too big, particularly when low-frequency band wavelength is very long.
Although electromagnetic wave can be constrained in sub-wavelength by Traditional Man surface plasma waveguide and surface wave photonic crystal
In the range of propagate, but the thickness of metal structure is at least a quarter of wavelength in vertical direction, although coplanar labor statement
The thickness of surface plasma waveguide can be far smaller than wavelength, but the curved waveguide without bending radius being made up of it can be produced
The transfer rate of very big scattering, not only serious reduction electromagnetic wave signal, and can cause between integrated device between signal
Crosstalk.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of ultra-thin surfaces ripple photonic crystal.
The ultra-thin surfaces ripple photonic crystal of the present invention sheet metal that two-dimensional and periodic is distributed above metal base plate is constituted, gold
Category piece is linked together by metal column with the metal base plate, filled media between the sheet metal and the metal base plate.
Cycle between the sheet metal is less than 1/6th operation wavelengths, and the thickness of the ultra-thin surfaces photonic crystal is less than 600
/ mono- operation wavelength.It is preferred that, the sheet metal area equation, shape are identical.
Described filled media can be Rogers, FR4, F4B or common printed circuit board, and the cycle between sheet metal is
Refer to the distance between adjacent metal piece center.Sheet metal form can change, hexagon, circle can, arrangement mode also may be used
To change.Such as triangular array even quasi-crystalline substance array, disordered array etc..
The invention also discloses the device based on ultra-thin surfaces ripple photonic crystal, by described ultra-thin surfaces glistening light of waves
Defect is introduced on the sheet metal of crystal so that the resonant frequency of the fault location is in the taboo of ultra-thin surfaces ripple photonic crystal around
Within band.
The invention also discloses a kind of ultra-thin surfaces ripple photonic crystal of energy control surface ripple transmission, it is in institute of the present invention
Obtained on the ultra-thin surfaces photonic crystal stated by introducing defect；The mode for introducing defect is the area for reducing sheet metal,
So that the resonant frequency of fault location is just in the forbidden band of surrounding photonic crystal.Therefore, when the defect of introducing is line defect,
Electromagnetic wave can be constrained in line defect and be propagated along line defect.
Further, when the defect of introducing is 90 degree of curved waveguides without bending radius, as long as the resonance frequency of defect
Rate is in the forbidden band of surrounding photonic crystal, and electromagnetic wave is can be by 90 degree of curved waveguides without bending radius, and can realize
Without the unreflected high efficiency of transmission of scattering.
Further, in described ultra-thin surfaces ripple photonic crystal in multiple directions by way of introducing line defect
Straight wave guide is introduced, one end of straight wave guide is connected mutually, and the dispersion curve of the straight wave guide on different directions is identical,；Described introduce lacks
Sunken mode is the area of reduction sheet metal, the area equation of the sheet metal for being reduced area.It is based in this way, constituting
The channel-splitting filter of ultra-thin surfaces ripple photonic crystal.Incident source is set in channel-splitting filter one end, and surface wave will be different along channel-splitting filter
Branch is propagated, and the average multi beam ripple that is divided into of incidence wave is transmitted so as to reach the purpose of partial wave, by the frequency of separated plane wave
Also identical, simply energy is divided into left and right two parts in equal size, reaches the purpose of partial wave on energy.
New type superthin surface wave photonic crystal proposed by the present invention, the new type superthin surface wave photonic crystal and traditional base
It is quite different in the photonic crystal of Bragg diffraction.Because the surface photon crystal is the surface glistening light of waves produced based on particular resonance
Sub- forbidden band, thus the cycle of the new type superthin surface wave photonic crystal be far smaller than wavelength, it is small for microwave and THz devices
Type has important application.
Brief description of the drawings
Fig. 1 (a) ultra-thin surfaces ripple photonic crystal schematic diagrames.(b) the surface wave Photonic Band figure.(c) table
The near field transmission spectrum of face ripple photonic crystal.
Fig. 2 (a) by the sub- crystal structure of the ultra-thin surfaces glistening light of waves coupling defect straight wave guide schematic diagram.(b) the ultra-thin surfaces ripple
Sub- crystal coupling straight wave guide near field transmission spectrum.(c) distribution map of the electric field of the straight wave guide.
Fig. 3 (a) by the sub- crystal structure of the ultra-thin surfaces glistening light of waves coupling defect curved waveguide schematic diagram.This is ultra-thin by Fig. 3 (b)
Surface marble crystal couples the distribution map of the electric field of curved waveguide.
Fig. 4 (a) by the sub- crystal structure of the ultra-thin surfaces glistening light of waves the T-shaped channel-splitting filter schematic diagram of coupling defect.(b) the ultra-thin table
The distribution map of the electric field of face marble crystal coupled T-type channel-splitting filter.
Embodiment
Shown in structure such as Fig. 1 (a) of ultra-thin surfaces ripple photonic crystal proposed by the present invention, the two dimension week above metal base plate
The square-shaped metal piece of phase property distribution is constituted, and sheet metal is linked together by metal column and bottom plate.Sheet metal and metal
Filled media between bottom plate.In one particular embodiment of the present invention, described sheet metal is square, square-shaped metal piece
Size be length of side a=4mm, cycle d=5mm, the distance between sheet metal and metal base plate is h=1.507mm.Calculate first
, shown in such as Fig. 1 (b), there is a light between single order pattern and second mode in the energy band diagram of the ultra-thin surfaces ripple photonic crystal
Sub- crystal bandgap.Any surface wave is not supported in the band gap, so the photonic band gap is called Surface wave bandgap.
A ultra-thin surfaces ripple photon crystal structure as shown in Fig. 1 (a) has been printed with printed circuit board technology, and has been measured
Near-field surface ripple transmission spectrum of the structure between 3-8GHz, shown in such as Fig. 1 (c), it can be seen that in 5.2GHz to 6.3GHz
Between there is a transmission trap band, the just Surface wave bandgap in corresponding diagram 1 (b).
Waveguide mode is introduced in the ultra-thin surfaces ripple photonic crystal band by the method for being introduced into defect, thus can be with
Electromagnetic wave propagation is controlled using in the ultra-thin photonic crystal.Defect is introduced by the method for the area for reducing sheet metal,
As shown in Fig. 2 (a), as soon as the a=3.5mm that the length of side of row sheet metal is reduced from a=4mm, in the ultra-thin surfaces glistening light of waves
A straight wave guide is constructed in sub- crystal.The transmission spectrum of the straight wave guide is tested, as shown in Fig. 2 (b) black lines, is prohibited in ultra-thin surfaces ripple
A passband is observed in band, the passband is placed exactly among the forbidden band of ultra-thin surfaces ripple photonic crystal around, so surface
Ripple is propagated by constraining in the straight wave guide tightly.Shown in the distribution map of the electric field of the straight wave guide such as Fig. 2 (c), it can be seen that surface
Ripple is propagated forward without penetrating among surrounding photonic crystal along the straight wave guide.
Because the eigen mode of the ultra-thin surfaces ripple photonic crystal waveguide has quadruple rotational symmetry, it is possible to use the spy
Property construct without scattering curved waveguide that also unreflected bending radius is zero, shown in such as Fig. 3 (a), the curved waveguide is by one
Series of defect is arranged in 90 degree, and such surface wave will be propagated along 90 degree of curved waveguides.The Electric Field Distribution of the curved waveguide
As shown in Fig. 3 (b), it can be seen that almost do not reflect, also do not scatter when surface wave is by the curved waveguide.
The present embodiment have also been constructed a T-shaped surface wave splitter, shown in such as Fig. 4 (a), and three branch's straight wave guide compositions should
T-shaped channel-splitting filter；Three branches are formed by way of reducing sheet metal area, i.e., reduce the length of side of sheet metal from a=4mm
During a=3.5mm.Shown in its near field distribution figure such as Fig. 4 (b), incident surface wave, which is averaged, as seen from the figure is split into left and right
Both direction is propagated.
Claims (10)
1. a kind of ultra-thin surfaces ripple photonic crystal, it is characterised in that the sheet metal structure that two-dimensional and periodic is distributed on metal base plate
Into sheet metal is linked together by metal column with the metal base plate, is filled between the sheet metal and the metal base plate
Medium；Cycle between the sheet metal is less than 1/6th operation wavelengths, and the thickness of the ultra-thin surfaces photonic crystal is small
In 61 percent operation wavelengths.
2. ultra-thin surfaces ripple photonic crystal according to claim 1, it is characterised in that the sheet metal area equation, shape
It is identical.
3. a kind of device based on ultra-thin surfaces ripple photonic crystal described in claim 1, it is characterised in that in described ultra-thin table
Introduce defect on the ripple photonic crystal of face, the resonant frequency of the fault location be in ultra-thin surfaces ripple photonic crystal around forbidden band it
It is interior.
4. device according to claim 3, it is characterised in that the mode of the introducing defect is the area for reducing sheet metal,
And make it that being reduced the resonant frequency at the sheet metal of area is just in the forbidden band of ultra-thin surfaces ripple photonic crystal around；Institute
State the area equation for the sheet metal for being reduced area.
5. device according to claim 4, it is characterised in that the shape of the sheet metal for being reduced area is identical, does not subtract
The area equation of the sheet metal of small area, shape are identical.
6. a kind of straight wave guide based on ultra-thin surfaces ripple photonic crystal described in claim 1, it is characterised in that described ultra-thin
The line defect through ultra-thin surfaces ripple photonic crystal is introduced on surface wave photonic crystal, the resonant frequency of the fault location is in week
Within the forbidden band for enclosing ultra-thin surfaces ripple photonic crystal；The mode for introducing line defect is the sheet metal on reduction straight line
Area so that the resonant frequency of fault location is just in the forbidden band of ultra-thin surfaces ripple photonic crystal around；It is described to be reduced face
The area equation of long-pending sheet metal.
7. a kind of curved waveguide based on ultra-thin surfaces ripple photonic crystal described in claim 1, it is characterised in that surpass in described
Bending defect is introduced on thin surface ripple photonic crystal, the head and the tail two ends of the bending defect are located at ultra-thin surfaces ripple photonic crystal
On border, the resonant frequency of the fault location is within the forbidden band of ultra-thin surfaces ripple photonic crystal around；It is described to introduce bending
The mode of defect is the area for reducing the sheet metal on buckling curve so that the resonant frequency of fault location is just in ultra-thin around
In the forbidden band of surface wave photonic crystal；The area equation of the sheet metal for being reduced area.
8. curved waveguide as claimed in claim 7, it is characterised in that described sweep is without bending half comprising one or more
The broken line of 90 degree of knuckles in footpath.
9. a kind of resonator based on ultra-thin surfaces ripple photonic crystal described in claim 1, it is characterised in that described ultra-thin
Line defect is introduced on surface wave photonic crystal, the two ends of line defect are respectively positioned on the inside of ultra-thin surfaces ripple photonic crystal, described to lack
The resonant frequency for falling into place is within the forbidden band of ultra-thin surfaces ripple photonic crystal around；The mode for introducing line defect is reduction
The area of sheet metal on straight line so that the resonant frequency of fault location is just in around ultra-thin surfaces ripple photonic crystal
In forbidden band；The area equation of the sheet metal for being reduced area.
10. a kind of channel-splitting filter based on ultra-thin surfaces ripple photonic crystal described in claim 1, it is characterised in that described ultra-thin
Introduce straight wave guide, the mutual phase in one end of straight wave guide in surface wave photonic crystal in multiple directions by way of introducing line defect
Even, the dispersion curve of the straight wave guide on different directions is identical, and the mode for introducing defect is described to reduce the area of sheet metal
It is reduced the area equation of the sheet metal of area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710373960.6A CN107315204A (en) | 2017-05-24 | 2017-05-24 | Ultra-thin surfaces ripple photonic crystal |
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| CN201710373960.6A CN107315204A (en) | 2017-05-24 | 2017-05-24 | Ultra-thin surfaces ripple photonic crystal |
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