CN208208953U - A kind of much frequency resonance chamber based on metal nano dielectric posts - Google Patents
A kind of much frequency resonance chamber based on metal nano dielectric posts Download PDFInfo
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- CN208208953U CN208208953U CN201820907803.9U CN201820907803U CN208208953U CN 208208953 U CN208208953 U CN 208208953U CN 201820907803 U CN201820907803 U CN 201820907803U CN 208208953 U CN208208953 U CN 208208953U
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Abstract
The utility model discloses a kind of much frequency resonance chamber based on metal nano dielectric posts, including 8 metal-dielectric nano-pillars, it is R that 4 metal-dielectric nano-pillars in 8 metal-dielectric nano-pillars, which are symmetrically distributed in period radius,1Internal layer border circular areas boundary on, in addition 4 metal-dielectric nano-pillars be symmetrically distributed in period radius be R2Outer layer border circular areas boundary on, the R1Length ratio R2Length it is short.The utility model utilizes the characteristic of metal and dielectric surface plasma wave, realize that exterior light or electromagnetic signal pass through resonance of the plasma wave inside structural unit, cause resonance different in inside from conventional resonance chamber source, it is acted on simultaneously with plasma wave and forms resonance between nano-pillar, so that resonant cavity both can be mutually indepedent, an entirety can be formed again, thus the resonant cavity of one multi-frequency of composition.
Description
Technical field
The utility model belongs to electromagnetic technology field, and specifically a kind of multi-frequency based on metal nano dielectric posts is humorous
Shake chamber.
Background technique
Electromagnetic wave is the concussion particle wave for deriving transmitting in space by same phase and mutually perpendicular electric field and magnetic field, is
The electromagnetic field propagated in the form of fluctuation has duality principle.Under excitation of electromagnetic wave, plasma is produced in light wave and metal
Raw coupling generates surface plasma body resonant vibration in free space-metal and metal-dielectric interface.When metal and medium are multiple
When conjunction nano wire constitutes certain space, adjacent plasma wave forms plasma wave resonance in cavity.Due to MULTILAYER COMPOSITE
Nano wire forms different cavitys, different incident waveforms at plasma wave can in different cavitys resonance, constitute multifrequency
Rate resonant cavity.
Currently, the development trend of resonant cavity is respectively as follows: direction and the frequency for providing feedback energy and selecting light wave, mainly
Show as the direction and frequency limit to intracavitary concussion light beam.Generally, the effect of resonant cavity is that selection frequency is certain, direction is consistent
Light make prepreerence amplification, and the light of other frequencies and direction is inhibited, the resonant cavity of multi-frequency can not be formed.
The microwave that Chinese Patent Application No. 2006100496534 discloses a kind of dielectric film of thickness in micron dimension is multiple
The measuring device of dielectric constant, it includes resonant cavity, Network Analyzer and dielectric substrate, it is characterised in that the two of the resonant cavity
End is equipped with RF coupler, and middle part is equipped with through-hole, and the dielectric substrate is used to bearing medium film, can be inserted into the through-hole simultaneously
Two couplers that both ends are in resonant cavity are connected；The invention is provided with through-hole in the middle part of resonant cavity, therefore will can not plate medium
The dielectric substrate of film and the dielectric substrate for having plated dielectric film are inserted into respectively in the through-hole of the resonant cavity, obtain two groups of resonance
Frequency and figure of merit value, and then according to two groups of data obtained in conjunction with resonant cavity, dielectric substrate and dielectric film
Geometric dimension extrapolates the complex dielectric permittivity of dielectric film, real part and loss angle tangent including complex dielectric permittivity.But at present
Resonant cavity is applied individually to any metal nano dielectric posts not yet, so that resonant cavity not only can be mutually indepedent, but also can form one
It is whole, thus the resonant cavity of one multi-frequency of composition.
Summary of the invention
The purpose of this utility model is exactly in order to solve the above technical problems, in electromagnetic technology field, using in resonant cavity circle
The specific frequency incidence wave in face and the interaction of plasma wave, light local are located in the working region of a very little, concurrently
Life interferes, and incident light is caused to be enhanced since constructive interference occurs；The local electricity of metal Nano structure is utilized simultaneously
Magnetic field-enhanced and enhanced light scattering characteristic further improves with good sunken luminous effect in solar cells, is obtained
The photoelectric conversion efficiency of solar battery；It is being passed with inside configuration multi-resonant characteristic as the detection of external multifrequency signal
Sensor technology has important application value；With nanostructure resonance characteristic, it can be achieved that light and electromagnetic wave signal device collection
At.
The technical solution adopted in the utility model is as follows: a kind of much frequency resonance chamber based on metal nano dielectric posts, packet
8 metal-dielectric nano-pillars are included, 4 metal-dielectric nano-pillars in 8 metal-dielectric nano-pillars are symmetrically distributed in week
Phase radius is R1Internal layer border circular areas boundary on, in addition 4 metal-dielectric nano-pillars be symmetrically distributed in period radius be R2's
On outer layer border circular areas boundary, the R1Length ratio R2Length it is short.
The outer layer material of the metal-dielectric nano-pillar is metallic silver.
The metal-dielectric nano-pillar is in air environment.
Scattering and absorption characteristic are generated by electromagnetic wave incident in the metal-dielectric nano-pillar.
Specifically, the utility model has the beneficial effect that
1) characteristic for utilizing metal and dielectric surface plasma wave realizes that exterior light or electromagnetic signal are existed by plasma wave
Resonance inside structural unit causes resonance different from conventional resonance chamber source in inside.
2) make resonance characteristic that is structure formed, and utilizing nanostructure with nano unit, believe light and electromagnetic wave
Number device it is integrated.
3) it is acted on plasma wave and forms resonance between nano-pillar, so that resonant cavity not only can be mutually indepedent, but also can
To form an entirety, thus the resonant cavity of one multi-frequency of composition；The resonant cavity, mode of resonance and resonance manner are different from
The resonant cavity of existing single-frequency.
Detailed description of the invention
Fig. 1 is the much frequency resonance cavity configuration schematic diagram based on metal nano dielectric posts.
Fig. 2 is the much frequency resonance chamber scattering section figure and absorption cross-section based on metal nano dielectric posts in embodiment 1
Figure.
Fig. 3 is the much frequency resonance chamber scattering section figure and absorption cross-section based on metal nano dielectric posts in embodiment 2
Figure.
Fig. 4 (a), Fig. 4 (b) and Fig. 4 (c) are the field patterns of embodiment 1.
Fig. 5 (a), Fig. 5 (b) and Fig. 5 (c) are the field patterns of embodiment 2.
Specific embodiment
The utility model is further described with reference to the accompanying drawings and examples:
As shown in Figs. 1-5, the utility model it include 8 metal-dielectric nano-pillars, 8 metal-dielectric nanometers
It is R that 4 metal-dielectric nano-pillars in column, which are symmetrically distributed in period radius,1Internal layer border circular areas boundary on, other 4 gold
It is R that category-medium nano-pillar, which is symmetrically distributed in period radius,2Outer layer border circular areas boundary on, wherein R1Length ratio R2Length
It is short.The outer layer material of the metal-dielectric nano-pillar is metallic silver, and in air environment.
Scattering and absorption characteristic are generated by electromagnetic wave incident in the metal-dielectric nano-pillar, and then derived
The near field of periodic structure and Far Field Scattering characteristic, according to theory deduction, by the limit member method in numerical simulation come proof theory meter
The result of calculation: Drude-Lorentz model is chosen as the relative dielectric constant ε for calculating metallic silverMThe model of (ω), expression
Formula are as follows:
Wherein, εMIt is that ω is the angular frequency of light, ε for relative dielectric constant∞For the relative dielectric constant as ω → ∞,
ωPFor plasma frequency, Δ is Lorentz weights, ΓLTo vibrate spectrum width, ΩLFor Lorentz oscillator strengths；It chooses
Coating material of the metallic silver as structure, design parameter are as follows: ε∞=2.4064, ωP=2 π × 2214.6 × 1012Hz,
π × 4.8 × 10 γ=212Hz, Δ=1.6604, ΩL=2 π × 1330.1 × 1012Hz, ΓL=2 π × 620.7 × 1012Hz。
For two layers of metal-dielectric nano-pillar periodic structure as, incidence wave Hz is write to the form of cylindrical wave, (ρj,φj)
The local coordinate for indicating j rank metal nano dielectric wire, by (Φ0,ΦM,ΦD) and (Ψ0,ΨM) be defined as in respective region
Incident cylindrical wave and scattered wave column vector and basic underlying variables, derive free space ρ respectivelyj> r1, intermediate metal layer r2<
ρj< r1, innermost layer dielectric core ρj< r2The magnetic-field component at place | Hz| expression formula are as follows:
Wherein,Peak factor for the incidence wave indicated by cylinder fourier progression expanding method formula, wherein
For incidence angle；Formula (1)~(3) respectively represent incidence wave and scattered wave, i.e. (Φ0,ΦM,ΦD) wave inwardly propagated is represented,
(Ψ0,ΨM) outside scattered wave is represented, expression is as follows:
Wherein JmFor m rank Bessel function,For m rank Hankel function of the first kind；G in formula (4)jIndicate different coordinates
The mutual conversion of system, subscript j indicates that the scattered field of other cylinders transforms to j object, in the scattered field in a j rank, GiAnd Dj
Similarly；σ in formula (4)q,jAnd αqIt is the transformation factor of addition theorem, expression formula is as follows:
αq=[(- 1)m-nJm-n((k0R)ein(q-1)θ] (9)
Ap=-T(1)·kp(p=2,3 ..., N) (11)
Dj=[ein(j-1)θδnn′] (13)
Wherein, Λp,Ap,kpIt is all the transformation factor obtained using Graf addition theorem, I is a unit matrix, δnn′For
Kronecker function, k0For the wave number of free space,For the wave number of metal layer,For medium kernel
Wave number, b are the amplitude vector of incidence wave；Based on local coordinate (ρ, φ), carry out between following cylindrical coordinates and plane coordinates
Coordinate transform:
ζpθ/2 (14)=pi/2-(p-1)
dp=2R sin [θ/2 (p-1)] (15)
T in formula (1)~(4)(1), T(2), T(3)And T(4)All it is the transformation matrix of the field in two kinds of regions, indicates transformation matrix
Addition theorem, and be diagonal matrix, be expressed as follows:
T(1)=Rfm+Ffm·Rmd·(I-Rmf·Rmd)-1·Fmf (17)
T(2)=(I-Rmf·Rmd)-1·Fmf (18)
T(3)=Rmd·(I-Rmf·Rmd)-1·Fmf (19)
T(4)=Fdm·(I-Rmf·Rmd)-1·Fmf (20)
Wherein, RijAnd Fij(i, j=f, m, d) is the reflection and transmission column wave indicated from the region the region " j " directive " i "
Diagonal matrix, index f, m, d indicate free space, metal and medium kernel；Rfm、RmdAnd RmfRespectively indicate from metal interface to
Free space, from medium kernel to metal interface, reflection matrix from free space to metal interface, FfmAnd FmfIt indicates from gold
Belong to interface to free space, projection matrix from free space to metal interface is diagonal matrix.
Embodiment 1: with period radius R1=85.5nm, R2For two layers of 8 cylindrical structure models of=116.67nm, gold
Belong to the nano wire outer radius r of (Ag)-dielectric cylinder1=60nm, medium nuclear radius r2=45nm, the thickness r of metal layer1-r2=
15nm, permittivity ε/ε of medium0=10 and frequency range be f=5e13~2.5e14HzCylindrical periodic structure.In Fig. 2
Three resonance frequency frequencies are f=1.2268e respectively14Hz, f=2.0038e14HzAnd f=2.3045e14HzPlace, corresponding diagram 4
(a), Fig. 4 (b) and three field patterns of Fig. 4 (c), it is seen that from small to large, three frequency resonant cavities divide same three resonance frequencies
It is not that intermediate 4 nano-pillars constitute cavity, inside and outside 4 nano-pillars form the big cavity of outer layer cavity and inside and outside synthesis.
Embodiment 2: with period radius still for R1=85.5nm, R2Two layers of 8 cylindrical structure models of=116.67nm are
Example, metal (Ag)-dielectric cylinder nano wire outer radius r1=60nm, medium nuclear radius r2=30nm, the thickness r of metal layer1-
r2=30nm, dielectric core permittivity ε/ε0=10 and frequency range be f=5e13~3e14HzCylindrical periodic structure, Fig. 3
In three resonance frequency frequencies be f=1.3687e respectively14Hz, f=2.4192e14HzAnd f=2.7626e14HzPlace, corresponding diagram 5
(a), Fig. 5 (b) and three field patterns of Fig. 5 (c), it is seen that same three resonance frequencies from small to large, during resonant cavity is also respectively
Between 4 nano-pillars constitute cavitys, inside and outside 4 nano-pillars form the big cavity of outer layer cavity and inside and outside synthesis.
The utility model relates to other undeclared parts it is same as the prior art.
Claims (4)
1. a kind of much frequency resonance chamber based on metal nano dielectric posts, it is characterised in that including 8 metal-dielectric nano-pillars,
It is R that 4 metal-dielectric nano-pillars in 8 metal-dielectric nano-pillars, which are symmetrically distributed in period radius,1Internal layer it is round
On zone boundary, it is R that in addition 4 metal-dielectric nano-pillars, which are symmetrically distributed in period radius,2Outer layer border circular areas boundary on,
The R1Length ratio R2Length it is short.
2. the much frequency resonance chamber according to claim 1 based on metal nano dielectric posts, which is characterized in that the gold
Category-medium nano-pillar outer layer material is metallic silver.
3. the much frequency resonance chamber according to claim 1 based on metal nano dielectric posts, which is characterized in that the gold
Category-medium nano-pillar is in air environment.
4. the much frequency resonance chamber according to claim 1 based on metal nano dielectric posts, which is characterized in that the gold
Scattering and absorption characteristic are generated by electromagnetic wave incident in category-medium nano-pillar.
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| CN108539355A (en) * | 2018-06-12 | 2018-09-14 | 南京林业大学 | A kind of much frequency resonance chamber based on metal nano dielectric posts |
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| CN108539355A (en) * | 2018-06-12 | 2018-09-14 | 南京林业大学 | A kind of much frequency resonance chamber based on metal nano dielectric posts |
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