CN204086728U - A kind of Terahertz electric-field enhancing device guided wave structure formed with air-gap conical gradual change - Google Patents
A kind of Terahertz electric-field enhancing device guided wave structure formed with air-gap conical gradual change Download PDFInfo
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- CN204086728U CN204086728U CN201420495432.XU CN201420495432U CN204086728U CN 204086728 U CN204086728 U CN 204086728U CN 201420495432 U CN201420495432 U CN 201420495432U CN 204086728 U CN204086728 U CN 204086728U
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- gradual change
- air
- gap
- conical gradual
- wave guide
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Abstract
With the Terahertz electric-field enhancing device that air-gap conical gradual change is guided wave structure formed, relate to Terahertz.Be provided with conical gradual change Medium Wave Guide, both sides sheet metal and air-gap; Conical gradual change Medium Wave Guide bottom surface is of a size of a
1× b
1, upper bottom surface is of a size of a
2× b
2, wherein a
2≤ a
1, b
2≤ b
1, getting equal sign when the two is different, is highly h
1; Both sides sheet metal is close to the two sides of conical gradual change Medium Wave Guide, and the shape of both sides sheet metal is consistent with conical gradual change Medium Wave Guide side of ining succession mutually, and the thickness of both sides sheet metal is greater than the skin depth of corresponding band THz wave; Air-gap is positioned at conical gradual change ripple Medium Wave Guide upper bottom surface central tip, and air-gap is parallel with rectangular coordinate system xoz face and non-intersect with both sides sheet metal; The thickness of air-gap is t, is highly h
2, the length b of width and cone point
2equal, t<b
2, h
2<h
1.Loss is low, it is little to reflect, bandwidth, structure are simple, be easy to processing.
Description
Technical field
The utility model relates to Terahertz, particularly a kind of Terahertz electric-field enhancing device guided wave structure formed with air-gap conical gradual change.
Background technology
THz wave (Terahertz waves) generally refers to that frequency range is the electromagnetic wave of 0.1 ~ 10THz, and corresponding wavelength coverage is 3 ~ 0.03mm, between microwave and infrared ray, is in the intersection region of macroelectronics and microcosmic photonics.Because residing electromagnetic spectrum position is special, THz wave has the character of a series of uniqueness as wide instant bandwidth, high s/n ratio, Low emissivity energy, have very strong penetrability etc. to non-polarized material, has huge application potential in a lot of fields; Especially there is the THz wave of high electric field intensity, in the field such as Terahertz nonlinear optics, terahertz light spectroscopy, higher hamonic wave generation, near field terahertz imaging, radar, communication, electronic countermeasure, all there is very important Subject Value and wide application prospect.
In recent years, the research and development of domestic and international THz source aspect is very rapid, relates to: electronics THz sources such as solid-state frequency multiplication source, carcinotron, Gunn oscillator, quantum cascade laser, free electron laser and take the photonics THz source of the methods such as optical rectification, optical mixing, equation of light frequency, photoconduction, optical parameter, Cherenkov radiation effect.But the intensity of radiation electric field of room temperature THz source common is at present often less, how to improve the key issue that Terahertz electric field intensity is current Terahertz Technology research further.With regard to there is the optical rectification THz source of higher conversion efficiency, wider tuning range, preferably coherence, by adopting off axis paraboloidal mirror to the THz wave carried out collimation focusing optical rectification THz source and give off, THz wave electric field intensity can be obtained and be about kV/cm ~ 1.2MV/cm magnitude, but owing to being subject to the restriction of optical diffraction limit, paraboloidal mirror cannot make the ripple spot radius of THz wave focus to λ
0/ 2nsin (θ) below, therefore is difficult to obtain higher THz wave electric field intensity.In order to break through the diffraction limit restriction of traditional optical, researchist proposes that metal conic grading structure, Meta Materials etc. are multiple has the guided wave structure formed for realizing Terahertz electric-field enhancing of sub-wavelength dimensions, but this kind ofly guided wave structure formedly but often there is the low problem of THz wave coupling efficiency.Therefore, seek the novel Terahertz electric-field-enhancement structure with high coupling efficiency, function admirable, just seem particularly urgent.
Summary of the invention
The purpose of this utility model is, in order to efficient coupling THz wave also realize higher electric-field enhancing effect, to provide a kind of Terahertz electric-field enhancing device guided wave structure formed with air-gap conical gradual change.
The utility model is provided with conical gradual change Medium Wave Guide, both sides sheet metal and air-gap;
Described conical gradual change Medium Wave Guide bottom surface is of a size of a
1× b
1, upper bottom surface is of a size of a
2× b
2, wherein a
2≤ a
1, b
2≤ b
1, getting equal sign when the two is different, is highly h
1; Both sides sheet metal is close to the two sides of conical gradual change Medium Wave Guide, and the shape of both sides sheet metal is consistent with conical gradual change Medium Wave Guide side of ining succession mutually, and the thickness of both sides sheet metal is greater than the skin depth of corresponding band THz wave; Air-gap is positioned at conical gradual change ripple Medium Wave Guide upper bottom surface central tip, and air-gap is parallel with rectangular coordinate system xoz face and non-intersect with both sides sheet metal, and the thickness of air-gap is t, and the height of air-gap is h
2, the length b of air-gap width and cone point
2equal, wherein, t<b
2, h
2<h
1.
Described conical gradual change Medium Wave Guide can adopt high-k conical gradual change Medium Wave Guide, high-k ε
d>=2.Four sides of described conical gradual change Medium Wave Guide can linearly type, parabolic type, hyperbolic-type or the gradual change of order of a polynomial ladder type.
Described both sides sheet metal can adopt silver plate, copper coin, golden plate or other good conductor plate, and both sides sheet metal can adopt pressing, plated film or other technique to be made; The shape of described both sides sheet metal matches with the conical gradual change Medium Wave Guide side view be close to, also linearly type, parabolic type, hyperbolic-type or the gradual change of order of a polynomial ladder type.
Described air-gap has sub-wavelength dimensions.
The beneficial effects of the utility model are as follows:
(1) the utility model have loss low, reflect little, bandwidth, structure simple, be easy to the advantages such as processing.
(2) the utility model can overcome traditional optical focus method and has that the restriction of diffraction limit, metal mold conical gradual change structure and metamaterial structure etc. are guided wave structure formed exists the low problem of coupling efficiency, and THz wave coupling feed-in and the larger electric-field enhancing effect that can realize greater efficiency export.
(3) the utility model can carry out integrated design with the nonlinear crystal producing THz wave, for realizing High-Field, efficiently THz source.
(4) the utility model proposes a kind of simple, efficient and there is general THz wave electric-field enhancing method; Utilize the method, amplified by proper proportion, reduced moulded dimension, the utility model can realize the electromagnetic electric-field enhancing of microwave, millimeter wave, far infrared or other wave band.
Accompanying drawing explanation
Fig. 1 is the three-dimensional structure schematic diagram of the utility model embodiment.
Fig. 2 is the yoz schematic cross-section of the utility model embodiment.
Fig. 3 is the three-dimensional structure schematic diagram of the utility model embodiment with waveguide-coupled feed-in.
Fig. 4 is the simulation curve of the Terahertz electric-field enhancing effect of the utility model embodiment and its comparison structure.
Embodiment
Following examples will be further described the utility model by reference to the accompanying drawings.
See Fig. 1 and 2, the utility model embodiment is provided with conical gradual change Medium Wave Guide 1, both sides sheet metal 2 and air-gap 3.The material of conical gradual change Medium Wave Guide 1 is high dielectric constant material (ε
d>=2), bottom surface is of a size of a
1× b
1, upper bottom surface is of a size of a
2× b
2(a
2≤ a
1, b
2≤ b
1, when the two is different, get equal sign), be highly h
1; Both sides sheet metal 2 is close to the two sides of conical gradual change Medium Wave Guide 1, its material is silver, copper, gold or other good conductor, shape is consistent with Medium Wave Guide side of ining succession mutually, and thickness is greater than the skin depth of corresponding band THz wave, can be made by pressing, plated film or other technique; Air-gap 3 is positioned at conical gradual change ripple Medium Wave Guide upper bottom surface (tip) center, and it is parallel with rectangular coordinate system xoz face and non-intersect with both sides sheet metal 2, and thickness is t (t<b
2), be highly h
2(h
2<h
1), the length b of width and cone point
2equal.
Four sides linearly type, parabolic type, hyperbolic-type or gradual change of order of a polynomial ladder type of described conical gradual change Medium Wave Guide 1; The shape of described both sides sheet metal 2 matches with the conical gradual change Medium Wave Guide side view be close to, also linearly type, parabolic type, hyperbolic-type or the gradual change of order of a polynomial ladder type; Described air-gap 3 has sub-wavelength dimensions.
Principle of work of the present utility model is as follows:
By Medium Wave Guide, metal waveguide or the direct-coupled mode of other form waveguide, the THz wave of y direction polarization is fed into the bottom surface of conical gradual change Medium Wave Guide 1 of the present utility model; THz wave is transmitted along Medium Wave Guide 1 to its cone point, and because both sides sheet metal 2 effectively can suppress antenna with side radiation direction, along with cross sectional dimensions reduces, the ripple spot of THz wave will reduce gradually, electric field intensity will strengthen gradually; Meanwhile, because cone point place sub-wavelength air gap 3 exists, continuous on air-gap and Medium Wave Guide interphase according to electric displacement vector: D
d=D
air, i.e. ε
de
d=ε
aire
air, the electric field intensity of THz wave is further enhanced having in the air-gap 3 compared with low-k, sub-wavelength dimensions; Therefore, the utility model efficient coupling THz wave also can realize higher electric-field enhancing effect.
According to an embodiment of the present utility model as shown in Figure 3, the material of conical gradual change Medium Wave Guide 1 adopts and has larger specific inductive capacity LiNbO
3crystal (ε
lN~ 25.9), its bottom surface length of side a
1=b
1=600 μm, upper bottom surface length of side a
2=b
2=30 μm is highly h
1=1500 μm, and LiNbO
3optical axis of crystal direction is y direction; Conical gradual change Medium Wave Guide 1 two pairs of sides all adopt linear pattern gradual manner; Be close to the both sides sheet metal 2 on conical gradual change Medium Wave Guide 1, its material is gold, and thickness is 1 μm, and craft of gilding can be adopted to make; Air-gap is positioned at the tip of conical gradual change Medium Wave Guide 1, and air-gap has sub-wavelength dimensions, and it is highly h
2=100 μm, thickness is the length b at t=10 μm, width and upper conical tip
2equal is 30 μm, and it is parallel with rectangular coordinate system xoz face; The THz wave of y polarised direction is a by bottom side length
1=b
1=600 μm, be highly h
0the LiNbO that the both sides of=100 μm are gold-plated
3rectangular dielectric waveguide 4, coupling is fed into LiNbO
3conical gradual change Medium Wave Guide bottom surface, and guided wave structure formedly to transmit to its cone point along this.Two comparison structure of the present embodiment are the LiNbO with same size
3the gold-plated crystal conical gradual change in the guided wave structure formed and both sides of crystal conical gradual change is guided wave structure formed, and Fig. 4 is THz wave normalization electric-field enhancing effect and the simulation result along z-axis transmission range relation, for without air-gap, without gold-plated LiNbO
3crystal conical gradual change is guided wave structure formed, can obtain the Terahertz electric-field enhancing effect of about 4 times close to its most advanced and sophisticated place, as shown in Fig. 4 curve 5; For without the gold-plated LiNbO in air-gap, both sides
3crystal conical gradual change is guided wave structure formed, is highly improved, reaches 11 times, as shown in Fig. 4 curve 6 in the electric-field enhancing effect at its most advanced and sophisticated place; For band air-gap, the gold-plated the present embodiment in both sides, promoted further in the electric-field enhancing effect at its most advanced and sophisticated place, reached 34 times, as shown in Fig. 3 curve 7; Its reason is that both sides sheet metal effectively can suppress antenna with side radiation direction, improve the binding character of THz wave, and along with cross sectional dimensions reduces, the ripple spot of THz wave will reduce gradually, electric field intensity will strengthen gradually; Meanwhile, because tip place sub-wavelength air gap exists, according to electric displacement vector in air-gap and Medium Wave Guide interphase place continuity, the electric field intensity of THz wave is further enhanced having in the air-gap compared with low-k, sub-wavelength dimensions; Therefore, the utility model efficient coupling THz wave also can realize higher electric-field enhancing effect, has important application prospect.
The bottom surface of described conical gradual change Medium Wave Guide can with Medium Wave Guide, metal waveguide or other form waveguide-coupled feed-in electromagnetic wave; And this polarization of electromagnetic wave (polarization) direction is y direction.The described method realizing electric-field enhancing is simple, efficient and have generality; Utilize the method, amplified by proper proportion, reduced moulded dimension, the utility model can realize the electromagnetic electric-field enhancing of microwave, millimeter wave, far infrared or other wave band.
Claims (4)
1., with the Terahertz electric-field enhancing device that air-gap conical gradual change is guided wave structure formed, it is characterized in that being provided with conical gradual change Medium Wave Guide, both sides sheet metal and air-gap;
Described conical gradual change Medium Wave Guide bottom surface is of a size of a
1× b
1, upper bottom surface is of a size of a
2× b
2, wherein a
2≤ a
1, b
2≤ b
1, getting equal sign when the two is different, is highly h
1, the DIELECTRIC CONSTANT ε of described conical gradual change Medium Wave Guide
d>=2; Both sides sheet metal is close to the two sides of conical gradual change Medium Wave Guide, and the shape of both sides sheet metal is consistent with conical gradual change Medium Wave Guide side of ining succession mutually, and the thickness of both sides sheet metal is greater than the skin depth of corresponding band THz wave; Air-gap is positioned at conical gradual change ripple Medium Wave Guide upper bottom surface central tip, and air-gap is parallel with rectangular coordinate system xoz face and non-intersect with both sides sheet metal, and the thickness of air-gap is t, and the height of air-gap is h
2, the length b of air-gap width and cone point
2equal, wherein, t<b
2, h
2<h
1.
2. a kind of Terahertz electric-field enhancing device guided wave structure formed with air-gap conical gradual change as claimed in claim 1, is characterized in that four sides linearly type, parabolic type, hyperbolic-type or gradual change of order of a polynomial ladder type of described conical gradual change Medium Wave Guide.
3. a kind of Terahertz electric-field enhancing device guided wave structure formed with air-gap conical gradual change as claimed in claim 1, the shape that it is characterized in that described both sides sheet metal and the conical gradual change Medium Wave Guide side view be close to match, also linearly type, parabolic type, hyperbolic-type or the gradual change of order of a polynomial ladder type.
4. a kind of Terahertz electric-field enhancing device guided wave structure formed with air-gap conical gradual change as claimed in claim 1, is characterized in that described air-gap has sub-wavelength dimensions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420495432.XU CN204086728U (en) | 2014-08-29 | 2014-08-29 | A kind of Terahertz electric-field enhancing device guided wave structure formed with air-gap conical gradual change |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420495432.XU CN204086728U (en) | 2014-08-29 | 2014-08-29 | A kind of Terahertz electric-field enhancing device guided wave structure formed with air-gap conical gradual change |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204086728U true CN204086728U (en) | 2015-01-07 |
Family
ID=52179428
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|---|---|---|---|
| CN201420495432.XU Expired - Fee Related CN204086728U (en) | 2014-08-29 | 2014-08-29 | A kind of Terahertz electric-field enhancing device guided wave structure formed with air-gap conical gradual change |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155778A (en) * | 2014-08-29 | 2014-11-19 | 厦门大学 | Terahertz electric field intensifier with air gap conical gradually-changing guided wave structure |
-
2014
- 2014-08-29 CN CN201420495432.XU patent/CN204086728U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155778A (en) * | 2014-08-29 | 2014-11-19 | 厦门大学 | Terahertz electric field intensifier with air gap conical gradually-changing guided wave structure |
| CN104155778B (en) * | 2014-08-29 | 2017-02-01 | 厦门大学 | Terahertz electric field intensifier with air gap conical gradually-changing guided wave structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150107 Termination date: 20180829 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |