CN206892373U - A kind of Terahertz lens based on metal plate - Google Patents
A kind of Terahertz lens based on metal plate Download PDFInfo
- Publication number
- CN206892373U CN206892373U CN201720436221.2U CN201720436221U CN206892373U CN 206892373 U CN206892373 U CN 206892373U CN 201720436221 U CN201720436221 U CN 201720436221U CN 206892373 U CN206892373 U CN 206892373U
- Authority
- CN
- China
- Prior art keywords
- metal plate
- lens
- terahertz
- metal
- utility
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Aerials With Secondary Devices (AREA)
Abstract
The utility model discloses a kind of Terahertz lens based on metal plate, the lens by least three arranged in parallel, interval not etc., the consistent metal plate of length, the support composition of packing material and metal plate between metal plate, wherein the thickness of each metal plate and length are together decided on by the polarization state of incident light and the phase distribution requirement of lens.The course of work of the lens is as follows, the terahertz wave band electromagnetic wave signal of light source output turns into after it have passed through object lens collimation and linear polarizer polarization conversion collimates parallel linearly polarized light beam, light beam focuses on after being irradiated to the lens, finally receives the optical signalling after focusing on by receiver.The utility model proposes the Terahertz lens based on metal plate have compared to conventional geometric lens that dispersion is small, ohmic loss is low, coupling efficiency is high, advantages of simple structure and simple.
Description
Technical field
A kind of Terahertz lens based on metal plate are the utility model is related to, are related to waveguide guided wave field.
Background technology
Terahertz Technology is chosen as one of " the ten big technologies for changing future world " by the U.S., and " national pillar is classified as by Japan
First of ten big key strategy targets ".In almost all of Terahertz system, all need to be collimated and focused on lens, with full
Pedal system linearizes and densification demand.Lens play focus on light beam particularly for terahertz imaging system receiving and transmitting front end,
There is very important status in terahertz imaging system.Metal has high dielectric constant in terahertz wave band, quite
In a perfect electric conductor (Perfect Electric Conductor, PEC), terahertz emission can not penetrate the thing of conduction
Body, electromagnetic wave reflects in metal surface almost all, therefore for most of electromagnetic radiation, metal is all opaque.Terahertz
When hereby ripple is propagated in metal plate waveguide, group velocity changes less with frequency, does not produce dispersion substantially, therefore can effectively suppress
Transmit in mould because of GVD and caused by pulse stretching, pulse transmission distortion is small.Using metallic plate in terahertz wave band system
When making planar waveguide, electromagnetic wave hardly occurs when guided wave Es-region propagations are totally reflected due to evanescent wave caused by decay,
There is no Gu Si-Hansen displacement.The lens that Terahertz system uses at present are broadly divided into geometric lens and super surface lens.Geometry is saturating
Phase-modulation is by caused by the accumulation of optical path difference in mirror, therefore these optical elements are often heavier and size is much larger than
Wavelength, it is unfavorable for the lightness of system and integrated.Super surface lens general principle is Nanostructured metal surfaces electromagnetic field
Resonance effects, thickness of the phase-modulation independent of optical element, there is efficiency high, the advantages of thickness is small, compared to it is traditional thoroughly
Mirror is with the obvious advantage.The article of super surface Terahertz lens has Jiang X Y, Ye J S, He J W, et al. " An
Ultrathin terahertz lens with axial long focal depth based on metasurfaces, "
[J] .Optics Express, 2013,21 (24)：30030., Takebayashi Y, Konno T, Shimada S, et al.
“Focusing effect measurements of artificial dielectric multilayer lens with
Metal rectangular chips for terahertz wave band, " [J] .Applied Physics A, 2014,
115(2)：501-508., Yang Q, Gu J, Wang D, et al. " Efficient flat metasurface lens for
Terahertz imaging, " [J] .Optics Express, 2014,22 (21)：25931. etc., these super surface Terahertzs are saturating
Mirror has the advantages of ultra-thin, focusing efficiency is high, but needs focused-ion-beam lithography or beamwriter lithography in terms of testing making
Method, or need to use silicon-on-insulator (SOI), make it is complicated, it is expensive.In Mendis R, Nagai M, Wang
Y, et al. " Terahertz Artificial Dielectric Lens, " [J] .Scientific Reports, 2016,6.
Itd is proposed in this article, sheet metal is arranged in parallel at equal intervals according to phase distribution, while will be every using the method for chemical attack
Piece sheet metal, which corrodes, the different circular shape of radius of curvature, and the different sheet metal of each radius of curvature is arranged in parallel to produce focusing
Effect, the method for this sheet metal arranged in parallel is simple compared to method before, but this experiment of chemical attack metal plate
Method has operational hazards, precision shortcoming rambunctious.Using during super surface texture focused electromagnetic ripple inevitably in electricity
Dispersion and ohmic loss are produced during electromagnetic wave propagation, therefore designs the lens simply made while reduces Electromagnetic Wave Propagation mistake
Caused dispersion and ohmic loss become those skilled in the art's technical problem urgently to be resolved hurrily in journey.
Utility model content
In order to solve the above problems, the utility model proposes a kind of dispersion is small, ohmic loss is low, coupling efficiency is high, knot
A kind of simple Terahertz lens based on metal plate of structure.
Technical scheme：
The utility model proposes a kind of Terahertz lens based on metal plate, it is characterised in that it is parallel by least three
The support composition of arrangement, interval packing material not etc., between the consistent metal plate of length, metal plate and metal plate.
The material of the metal plate is metal, and it is greater than 10 in the electrical conductivity of terahertz wave band7S/m。
The thickness of the metal plate have to be larger than skin depth of the metal in terahertz wave band, and be put down by the metal
Phase place change Φ=β L caused by plate will meet the phase distribution requirement of lens
Wherein L is the length of the metal plate, and n is integer, and λ is design wavelength, and f is the focal length of lens, and x is the coordinate position in x directions,
Φ0For initial phase, β is the propagation constant of single metal flat unit structure, by between the polarization state and metal plate of incident light
Gap size together decide on.
Packing material between the metal plate is air.
The material of the support of the metal plate is polymer poly propyl ester.
The cycle of the metal plate is fixed, and is less than or equal to incident wavelength.
Beneficial effect：
1. the utility model is propagated when propagating THz wave between electromagnetic wave is limited in two panels metallic plate, by metallic plate
Perfection reflection, waveform and spectrum are almost non-warping, therefore dispersion is smaller.
2. the utility model is compared with other Terahertz lens, only by different-thickness metallic plate according to heap parallel at certain interval
Stack forms, simple in construction, is easy to make.
3. the utility model compared with other Terahertz lens, has the advantages of ohmic loss is low, coupling efficiency is high.
Brief description of the drawings
Below in conjunction with the accompanying drawings and concrete mode the utility model is described in further detail.
Fig. 1 is structural representation of the present utility model.
Fig. 2 be the utility model in single parallel metal flat unit structure incident light wavelength X0=1mm, metal are put down
Transmittance spectrum curve synoptic diagram in the range of the d=0.1~1mm of plate interval, illustration is single parallel metal flat unit knot in figure
The schematic diagram of structure.
Fig. 3 be the utility model in single parallel metal flat unit structure incident light wavelength X0=1mm, metal are put down
Phase spectrum curve map in the range of the d=0.1~1mm of plate interval, illustration showing for single parallel metal flat unit structure in figure
It is intended to.
Fig. 4 is embodiment 1 in the utility model, and the xz sections that the design Terahertz focal length of lens obtains when being f=10mm are electric
Field pattern.
Fig. 5 is embodiment 1 in the utility model, the electric field strength profile figure measured at focus z=10.5mm sections.
Fig. 6 is embodiment 2 in the utility model, and the xz sections electric field when design Terahertz focal length of lens is f=15mm divides
Butut.
Fig. 7 is embodiment 2 in the utility model, the electric field strength profile figure measured at focus z=15.5mm sections.
Embodiment
Just as described in the background section, how to design that a kind of dispersion is small, ohmic loss is low, coupling efficiency is high, structure
Simple terahertz wave band ultra-thin lens, turn into those skilled in the art's technical problem urgently to be resolved hurrily.Below in conjunction with the accompanying drawings and
The utility model is described in further detail for embodiment.
As shown in figure 1, it is the Terahertz lens arrangement schematic diagram of the present utility model based on metal plate, with eight pieces in figure
Exemplified by metal parallel flat, there are seven cycles.In figure (1) for arranged in parallel, interval not etc., the consistent metal plate of length,
(2) the packing material air between metal plate, (3) are the support of metal plate, and material is polymer poly propyl ester.P is metal
The cycle of flat board, intervals of the d between adjacent, parallel metallic plate, d subscript are represented away from which block metal plate among lens,
L is the length of metal plate, and electromagnetic wave is propagated, and is normal incidence in the z-direction.Incident light is the linearly polarized photon of TE patterns, electricity
The direction of vibration of field is y directions, and the direction of vibration in magnetic field is x directions.
A kind of Terahertz lens based on metal plate, including：At least three arranged in parallel, interval not etc., length it is consistent
Metal plate (1), the support (3) of the packing material (2) between metal plate and metal plate it is as shown in Figure 1.In Terahertz
Wave band has high dielectric constant, equivalent to one perfect electric conductor (Peffect Electric Conductor, PEC),
Terahertz emission can not penetrate the object of conduction, and electromagnetic wave reflects in metal surface almost all, therefore for most of electromagnetism
Radiation, metal is all opaque.When THz wave is propagated between metal plate, group velocity changes less, substantially not with frequency
Produce dispersion, thus can effectively suppress to transmit in mould because of GVD and caused by pulse stretching, pulse transmission distortion is small.It is flat
Row metal plate lens are formed by some parallel metallic plate arrangements, when electromagnetic wave is by this lens, similar to electromagnetic wave in ripple
As leading transmission.According to Huygen's principle, individually point light can be used as from the diffraction light wave sent between adjacent metal plate
Source, these spot lights have new initial electric field intensity and phase distribution, therefore the interference between these spot lights can produce
Specific interference figure.When incident light is TE polarization states, mode of operation can be inspired in metal plate waveguide is TE1Mould
Formula, TE1Propagation constant under pattern isK is vacuum wave vector, intervals of the d between parallel metal flat board, and L is
The spread length of metal plate, the definition of propagation constant is the phase place change in unit distance, therefore has phase delay Φ=β L.
Principle is that THz wave can produce mutation when metal plate array is propagated in the air-metal interface of metal plate cellular construction
Phase shift, this mutation phase shift are together decided on by the gap size between the polarization state and metal plate of incident light.Pass through different-thickness
Metal plate cellular construction array according to etc. periodic arrangement make diverse location mutation phase shift combinations meet a cylindrical wave phase
Position requires, so as to reach the effect of focusing.
The present embodiment metal plate is operated in TE1Mould, mode of operation TE1The metal plate of mould has propagation constantFig. 2 is single parallel metal flat unit structure in lambda1-wavelength λ0=1mm, metal plate interval d=
Transmittance spectrum curve synoptic diagram in the range of 0.1~1mm.Metal material selection is copper, and incident light polarizes for TE.Due to TE1Mould
Cutoff wavelength λ under formulac=2d, as d ＜ λcPropagation constant β is pure imaginary number when/2, does not propagate generation, transmitance 0, only d >=
λc/ 2 structures could be in guided wave mode, i.e., as d >=λdElectromagnetic wave can be just propagated during/2=0.5mm.The ripple as d=0.5mm
It is 0 to lead propagation constant, can just propagate electromagnetic wave, transmitance very low about 20%；As d ＞ 0.5mm, in guided mode shape
State, transmitance are almost constant, and mean transmissivity is about 90%.Fig. 3 is single parallel metal flat unit structure in incident light
Wavelength X0Phase spectrum curve synoptic diagram in the range of=1mm, metal plate interval d=0.1~1mm.The waveguide as d ＜ 0.5mm
Cut-off, propagation constant β are pure imaginary number, phase 0；As d=0.5mm, waveguide propagation constant is 0, phase 0；As d ＞ 0.5mm
When, propagation constant β is real number, and phase changes with d.Lens have phase distribution：X is
Coordinate position combination Fig. 2 and Fig. 3 of X-direction rationally set metal plate thickness p-d so that d=d (x) meets the phase point of lens
Cloth can produce focusing effect.
It is understandable to enable above-mentioned purpose of the present utility model, feature and advantage to become apparent, below in conjunction with the accompanying drawings to this
The embodiment of utility model is described in detail.
Embodiment 1：
It is λ to design an operation wavelengthd=1mm, Φ0=1.66 π, focusing length f=10mm lens example, period p=
1mm, it is made up of 18 pieces of metal plates, there are 17 metal plate gaps, it is public according to propagation constant formula and phase distribution
Formula calculates d corresponding with phase value, such as table 1 below.
Table 1
| d0 | d1 | d2 | d3 | d4 | d5 | d6 | d7 | d8 | |
| x(mm) | 0 | ±1 | ±2 | ±3 | ±4 | ±5 | ±6 | ±7 | ±8 |
| Φ(π) | 1.66 | 1.56 | 1.26 | 0.78 | 0.12 | 1.3 | 0.34 | 1.25 | 0.05 |
| d(mm) | 0.9 | 0.8 | 0.645 | 0.54 | 0.501 | 0.655 | 0.507 | 0.64 | 0.5 |
According to the corresponding relation metallic plate arranged in parallel in table 1, the electric-field intensity distribution shown in Fig. 4 is produced.Fig. 4 is this reality
The xz sections distribution map of the electric field obtained when the Terahertz focal length of lens is f=10mm is designed with new middle embodiment 1, can be with from figure
Find out Electromagnetic Wave Propagation by starting after the Terahertz lens (port is in z=0.5mm) based on metal plate in the present embodiment
Assemble, and it is observed that obvious electromagnetic wave focusing phenomenon, focal beam spot occurs, be consistent with design at z=10.5mm
Close.Fig. 5 is the electric field strength profile figure that the present embodiment measures at focus z=10.5mm sections in the utility model, from figure
The full width at half maximum for calculating focal spot is about 1mm, close to diffraction limit λ/2NA=0.77 λ=0.77mm of the present embodiment structure, its
Middle NA is the numerical aperture of lens, according to lens sizes and focal length be calculated for 0.65mm, focusing effect it is good.
Embodiment 2：
In another specific embodiment of the present utility model, one operation wavelength of design is λd=1mm, Φ0=1.66 π,
Focusing length f=15mm lens example, period p=1mm, it is made up of 28 pieces of metal plates, there are 27 metals
Flat board gap, d corresponding with phase value, such as table 2 below are calculated as propagation constant formula and phase distribution formula.
Table 2
| d0 | d1 | d2 | d3 | d4 | d5 | d6 | d7 | d8 | d9 | d10 | d11 | d12 | d13 | |
| x(mm) | 0 | ±1 | ±2 | ±3 | ±4 | ±5 | ±6 | ±7 | ±8 | ±9 | ±10 | ±11 | ±12 | ±13 |
| Φ(π) | 1.66 | 1.56 | 1.39 | 1.07 | 0.61 | 0.04 | 1.35 | 0.55 | 1.66 | 0.67 | 1.6 | 0.46 | 1.24 | 0 |
| d(mm) | 0.9 | 0.82 | 0.695 | 0.59 | 0.525 | 0.5 | 0.677 | 0.52 | 1.66 | 0.531 | 0.83 | 0.514 | 0.637 | 0.5 |
According to the corresponding relation metallic plate arranged in parallel in table 2, the electric-field intensity distribution shown in Fig. 6 is produced.Fig. 6 is this reality
The xz sections Electric Field Distribution schematic diagram when Terahertz focal length of lens is f=15mm is designed with new middle embodiment 2, can be with from figure
Find out Electromagnetic Wave Propagation by starting after the Terahertz lens (port is in z=0.5mm) based on metal plate in the present embodiment
Assemble, and it is observed that obvious electromagnetic wave focusing phenomenon, focal beam spot occurs, be consistent with design at z=15.5mm
Close.Fig. 7 is the electric field strength profile schematic diagram that embodiment 2 measures at focus z=15.5mm sections in the utility model, from figure
In to calculate the full width at half maximum of focal spot be about 0.92mm, close to this exemplary construction diffraction limit λ/2NA=0.75 λ=
0.75mm, focusing effect are good.
Compared to embodiment 1, not only focal length becomes big to embodiment 2 it can be seen from above table, and slit number also increases
It is more.This is due to when focal length becomes big, and the lateral dimension of increase increase structure can make it that full width at half maximum is smaller, focusing effect
More preferably.
Embodiment described above is only that preferred embodiment of the present utility model is described, not to this practicality
New spirit and scope are defined.On the premise of the utility model design conception is not departed from, ordinary people in the field couple
The all variations and modifications that the technical solution of the utility model is made, the scope of protection of the utility model, this reality all should be dropped into
With new claimed technology contents, all record in detail in the claims.
Claims (2)
- A kind of 1. Terahertz lens based on metal plate, it is characterised in that：By at least three arranged in parallel, interval not etc., it is long The packing material (2) and support (3) composition of metal plate spent between consistent metal plate (1), metal plate；It is wherein described Metal plate (1) is greater than 10 in the electrical conductivity of terahertz wave band7S/m, thickness have to be larger than metal becoming in terahertz wave band Skin depth, and to meet that the phase distribution of lens requires as phase place change Φ=β L caused by the metal plate (1)Wherein L is the length of the metal plate (1), and n is integer, and λ is design ripple Long, f is the focal length of lens, and x is the coordinate position in x directions, Φ0For initial phase, β is the propagation of single metal flat unit structure Constant, together decided on by the gap size between the polarization state and metal plate of incident light；Packing material between the metal plate (2) it is air；The cycle of the metal plate is fixed, and is less than or equal to incident wavelength.
- A kind of 2. Terahertz lens based on metal plate according to claim 1, it is characterised in that：The metal plate The material of support (3) be polymer poly propyl ester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720436221.2U CN206892373U (en) | 2017-04-19 | 2017-04-19 | A kind of Terahertz lens based on metal plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720436221.2U CN206892373U (en) | 2017-04-19 | 2017-04-19 | A kind of Terahertz lens based on metal plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206892373U true CN206892373U (en) | 2018-01-16 |
Family
ID=61324617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720436221.2U Expired - Fee Related CN206892373U (en) | 2017-04-19 | 2017-04-19 | A kind of Terahertz lens based on metal plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206892373U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110391579A (en) * | 2019-07-23 | 2019-10-29 | 天津大学 | A kind of super surface of medium generating the special light beam of double Terahertzs |
| CN117060090A (en) * | 2023-10-11 | 2023-11-14 | 华南理工大学 | Broadband circularly polarized planar integrated feed source transmission array antenna |
-
2017
- 2017-04-19 CN CN201720436221.2U patent/CN206892373U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110391579A (en) * | 2019-07-23 | 2019-10-29 | 天津大学 | A kind of super surface of medium generating the special light beam of double Terahertzs |
| CN110391579B (en) * | 2019-07-23 | 2020-09-11 | 天津大学 | Medium super-surface for generating double terahertz special beams |
| CN117060090A (en) * | 2023-10-11 | 2023-11-14 | 华南理工大学 | Broadband circularly polarized planar integrated feed source transmission array antenna |
| CN117060090B (en) * | 2023-10-11 | 2024-02-02 | 华南理工大学 | Broadband circularly polarized planar integrated feed source transmission array antenna |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Garcia-Vidal et al. | Spoof surface plasmon photonics | |
| Shen et al. | Generating millimeter-wave Bessel beam with orbital angular momentum using reflective-type metasurface inherently integrated with source | |
| Li et al. | Wideband radar cross section reduction using two-dimensional phase gradient metasurfaces | |
| CN100561797C (en) | A kind of negative refracting power microwave medium material and preparation method thereof | |
| Liu et al. | A design of ultra-wideband linear cross-polarization conversion metasurface with high efficiency and ultra-thin thickness | |
| Smith et al. | Design and measurement of anisotropic metamaterials that exhibit negative refraction | |
| CN206892373U (en) | A kind of Terahertz lens based on metal plate | |
| Zhang et al. | Experimental demonstration of Luneburg lens based on hyperuniform disordered media | |
| Achouri et al. | Comparison of two synthesis methods for birefringent metasurfaces | |
| Feng Ma et al. | Experimental realization of bending waveguide using anisotropic zero-index materials | |
| Zhuang et al. | Flexible and polarization-controllable diffusion metasurface with optical transparency | |
| CN107340600A (en) | A kind of Airy beam generator based on metal plate | |
| CN106896429B (en) | A kind of Terahertz lens based on metal plate | |
| Wu et al. | Design of high-transmittance all-dielectric focusing metasurface with polarization-controllable focus | |
| Aoki et al. | Experimental study on performance change in F-band surface-wave oscillator due to slow-wave structure length | |
| Wang et al. | Experimental evidence of photonic crystal waveguides with wide bandwidth in two-dimensional Al 2 O 3 rods array | |
| Hwang et al. | Reflection characteristics of a composite planar AMC surface | |
| Theobald et al. | High-intensity laser-plasma interaction with wedge-shaped-cavity targets | |
| CN111628295A (en) | Chiral super surface based on multi-crack square-ring linear polarization asymmetric transmission | |
| Kalaagi et al. | Fano resonance based multiple angle retrodirective metasuface | |
| CN207216167U (en) | A kind of Airy beam generator based on metal plate | |
| Li et al. | Propagation of arbitrarily polarized terahertz Bessel vortex beam in inhomogeneous unmagnetized plasma slab | |
| Imani et al. | A concentrically corrugated near-field plate | |
| Jin et al. | Canalization for subwavelength focusing by a slab of dielectric photonic crystal | |
| Monzon et al. | Three-dimensional focusing of broadband microwave beams by a layered photonic structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180116 Termination date: 20190419 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |