CN206627648U - A kind of flat axicon lens of all dielectric grating - Google Patents
A kind of flat axicon lens of all dielectric grating Download PDFInfo
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- CN206627648U CN206627648U CN201720224261.0U CN201720224261U CN206627648U CN 206627648 U CN206627648 U CN 206627648U CN 201720224261 U CN201720224261 U CN 201720224261U CN 206627648 U CN206627648 U CN 206627648U
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- axicon lens
- grating
- axicon
- conical surface
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- 230000003287 optical effect Effects 0.000 claims abstract description 7
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 3
- 238000010276 construction Methods 0.000 claims description 5
- 238000005286 illumination Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 3
- 238000000879 optical micrograph Methods 0.000 abstract 1
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001069 Raman spectroscopy Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000799 fluorescence microscopy Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011331 needle coke Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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Abstract
The utility model discloses a kind of flat axicon lens of all dielectric grating Diode laser.The flat axicon lens is by the axicon of GaN medium negative refraction optical grating constitutions, and the plane of incidence is plane, and exit facet is the rounding conical surface；Flat axicon lens is to be highly fixed as d⊥=145nm, external diameter be identical and internal diameter from bottom to top equal increments d∥=145nm Circular Ring Grating stacking is formed, and is vertical wall on the inside of annulus, the rounding conical surface of the drift angle line formation of Circular Ring Grating layer, the inner side rounding conical surface is in column symmetry.Such cone structure so that in flat axicon lens central axis constructive interference occurs for outgoing beam, so as to realize the Diode laser focusing to linearly polarized light beam.The utility model material is simple, structure is easily prepared, and has preferable application prospect in fields such as light capture, optical microphotograph, optical micro-manipulations.
Description
Technical field
The utility model belongs to artificial micro-structure material, more particularly to a kind of flat axicon lens of all dielectric grating.
Background technology
Diode laser Jiao Chang can be used for particle acceleration, fluorescence imaging, second_harmonic generation and raman study etc., be
The focus of Recent study, cause the extensive concern of researcher.
All there is the defects of certain, such as parabolic mirror in the lens for being traditionally used for being formed Diode laser, by being formed
Focus and incident light be located at parabola homonymy, limit burnt field use range；For another example surface plasma excimer lens, it is burnt
It is deep to be limited by near field focus.
The content of the invention
The defects of the utility model is in order to overcome prior art, there is provided one kind, can be inclined to line to be made up of Single Medium
The light beam that shakes realizes the lens that Diode laser focuses on.
To achieve these goals, the utility model uses following technical scheme：A kind of flat axicon lens of all dielectric grating, it is described
Flat axicon lens be by the axicon of GaN medium negative refraction optical grating constitutions, the plane of incidence is plane, and exit facet is the rounding conical surface；
The flat axicon lens is to be highly fixed as d⊥=145nm, external diameter be identical and internal diameter from bottom to top equal increments d∥=
145nm Circular Ring Grating stacking is formed, and be vertical wall on the inside of annulus, the rounding conical surface of the drift angle line formation of Circular Ring Grating layer,
The inner side rounding conical surface is in the annular step scalariform of column symmetry structure, and the angle between drift angle line and vertical plane is θ=45 °, grating
Periodicity is 25.
Further, the refractive index n=2.67 of GaN media.
Further, the equivalent negative index of flat axicon lens optical grating construction is by neff=n-λ/d⊥Obtain, operation wavelength λ=
During 532nm, grating vertical height d⊥=145nm, equivalent negative index neff=-1.
Further, flat axicon lens operation wavelength be 532nm line polarisation, column vector beam illumination can realize Diode laser
Focus on.
The utility model proposes a kind of grating prism being made up of Single Medium to realize the tightly focused to light beam, and handle
It makes flat axicon lens.This lens mainly utilize Fermat's principle, and 90 ° of deviation occurs in outgoing interface for incident light, not only can be with
For radial polarisation light to form light needle coke field, it can also be used to focus on rotation direction polarised light to form the Jiao Chang of light pipe shape, and
And the focousing field formed can reach the theoretical boundary of halfwidth.Can by the optical grating construction for rationally designing prism exit surface
To realize the flexible modulation of focusing field.
The beneficial effects of the utility model are：A kind of flat axicon lens of all dielectric grating of the present utility model, simple in construction, preparation
Easily, and can realize to the focusing of the Diode laser of incident ray polarized light beam.
Brief description of the drawings
Fig. 1 is the surface texture schematic diagram that the flat axicon lens of all dielectric grating realizes Diode laser.
Fig. 2 is that the flat axicon lens of grating realizes that Diode laser focuses on stereogram in the case of plane wave incidence.
Fig. 3 is that plane wave incidence forms the sectional view in laser accunputure formed coke field r-z faces in the case that screen periods are 25.
Embodiment
Embodiment of the present utility model is elaborated below in conjunction with the accompanying drawings, the present embodiment is with the utility model technology
Implemented under premised on scheme, give detailed embodiment and specific operating process, but protection of the present utility model
Scope is not limited to following embodiments.
It is as shown in Figure 1 the flat axicon lens structural representation of all dielectric grating, the plane of incidence is plane, and the outgoing conical surface is shaped as post pair
Claim the annular step scalariform of structure, every layer of ladder height is fixed as d⊥, internal diameter successively be incremented by d∥, annulus inner side is vertical wall.
It is illustrated in figure 2 the flat axicon lens of grating and realizes that Diode laser focuses on stereogram in the case of plane wave incidence.
As shown in figure 3, the dielectric grating long-focal-depth lens of the present embodiment, incidence wave is plane wave, in order in λ=532nm
Wave band in there is negative index, selected material is GaN refractive index n=2.67, arrange parameter d⊥=145nm, now according to etc.
N is calculated in the formula of effect negative indexeff=-1.
Raster width d is set in the present embodiment∥=145nm, 45 ° of incidence angle θ=, the construction unit along longitudinal direction are 25
Layer.
Fig. 3 gives radial polarisation light plane wave incidence that frequency is λ=532nm to the flat axicon lens, in its r-z plane
Field distribution of focal plane figure, Diode laser focusing is realized at axle center.
Thus embodiment can be seen that the utility model proposes flat axicon lens simple structure, and realize Diode laser focusing.
Claims (4)
- A kind of 1. flat axicon lens of all dielectric grating, it is characterised in that：Described flat axicon lens is by GaN medium negative refraction optical grating constitutions Axicon, the plane of incidence are plane, and exit facet is the rounding conical surface；The flat axicon lens is to be highly fixed as d⊥=145nm, external diameter be identical and internal diameter from bottom to top equal increments d∥=145nm Circular Ring Grating stacking form, be vertical wall on the inside of annulus, the rounding conical surface of the drift angle line formation of Circular Ring Grating layer, inner side is fallen Circular conical surface is in the annular step scalariform of column symmetry structure, and the angle between drift angle line and vertical plane is θ=45 °, screen periods number For 25.
- 2. the flat axicon lens of all dielectric grating according to claim 1, it is characterised in that：The refractive index n=of the GaN media 2.67。
- 3. the flat axicon lens of all dielectric grating according to claim 2, it is characterised in that：The flat axicon lens optical grating construction it is equivalent Negative index is by neff=n-λ/d⊥Obtain, during operation wavelength λ=532nm, grating vertical height d⊥=145nm, equivalent negative refraction Rate neff=-1.
- A kind of 4. flat axicon lens of all dielectric grating according to claim 3, it is characterised in that：The flat axicon lens is in operation wavelength It can realize that Diode laser focuses on for 532nm line polarisation, column vector beam illumination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720224261.0U CN206627648U (en) | 2017-03-09 | 2017-03-09 | A kind of flat axicon lens of all dielectric grating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720224261.0U CN206627648U (en) | 2017-03-09 | 2017-03-09 | A kind of flat axicon lens of all dielectric grating |
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| Publication Number | Publication Date |
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| CN206627648U true CN206627648U (en) | 2017-11-10 |
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| CN201720224261.0U Expired - Fee Related CN206627648U (en) | 2017-03-09 | 2017-03-09 | A kind of flat axicon lens of all dielectric grating |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111552075A (en) * | 2020-04-30 | 2020-08-18 | 南京邮电大学 | High-diffraction-efficiency negative refraction grating plano-concave mirror and design method thereof |
-
2017
- 2017-03-09 CN CN201720224261.0U patent/CN206627648U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111552075A (en) * | 2020-04-30 | 2020-08-18 | 南京邮电大学 | High-diffraction-efficiency negative refraction grating plano-concave mirror and design method thereof |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171110 |
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| CF01 | Termination of patent right due to non-payment of annual fee |