CN209590317U - A kind of long focusing glittering type negative refraction grating lens - Google Patents
A kind of long focusing glittering type negative refraction grating lens Download PDFInfo
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- CN209590317U CN209590317U CN201920308978.2U CN201920308978U CN209590317U CN 209590317 U CN209590317 U CN 209590317U CN 201920308978 U CN201920308978 U CN 201920308978U CN 209590317 U CN209590317 U CN 209590317U
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Abstract
The utility model discloses a kind of long focusing glittering type negative refraction grating lens, the lens include negative refraction grating and glittering ladder, the concentric ring ladder that the negative refraction grating is equal by height, radius is gradually incremented by from inside to outside forms, and the glittering ladder is made of the annular cone for being located at the concentric ring stepped surfaces；The utility model structure simply easily designs, material obtain be easy, when light from bottom vertically into structure when, structure exit surface occur diffraction, light is effectively focused on to default focal point, luminous energy is effectively utilized, have extremely strong focusing effect.
Description
Technical field
The utility model relates to a kind of long focusing glittering type negative refraction grating lens, belong to artificial micro-structure material Integrated Light
Learn technical field.
Background technique
With the development of scientific processing technology, size material small to nanometer order of magnitude can have been processed now, and this
A little materials have many special effects that it does not have under macro-scale, such as quantum size effect, small-size effect, surface
With interfacial effect and macro quanta tunnel effect etc., thus the fields such as communication, biomedicine, sensing and storage have it is wide
Application prospect.Artificial micro-structure material, which refers to, carries out design in structure and integration to the material of micro/nano-scale range to realize
To the flexible modulation of electromagnetic wave, some novel optical characteristics are obtained, are current optics and multidisciplinary forward position crossing domain is ground
Study carefully hot spot.
Compared to scalar light beam, the vector beam of polarization state space non-uniform Distribution is in temporal-spatial evolution and mutual with substance
Effect aspect contains richer physical effect.Wherein the polarization state of column vector beam (CVB) is axially in column in space
Symmetrical, this unique polarization state distribution character and relevant physical effect have attracted the research of vast researcher,
It has important application in multiple fields such as optical micro-manipulation, single molecular imaging, the micro-, micro Process of super-resolution.
Using conventional lenses, it can be achieved that the tightly focused of radial polarisation light.With going deep into for research, the control measures of CVB by
It gradually enriches, wherein the focusing of sub-wavelength dimensions, utilizes phasmon lens more.Gilad M.Lerman et al. is entitled
《Demonstration of Nanofocusing by the use of Plasmonic Lens Illuminated with
Radially Polarized Light " article in experimental verification focusing of the phasmon lens to radial polarisation light, see
NANO LETTERS the 2139-2143 pages of record of the 5th phase of volume 9, but phasmon is a kind of coupled mode of evanescent wave,
Far distance can not be propagated, can only realize the focusing near lens surface, and due to the polarization independent of phasmon excitation
Condition makes it be confined to radial polarisation light situation for the sub-wavelength focusing of CVB.
Other than, traditional paraboloidal mirror by the transformation to wavefront so that light beam is towards same directionally focused,
Can be with the depth tightly focused of radial polarisation light, but there are certain disadvantage, in-field and focousing field positions for the method for its reflection focusing
In the ipsilateral of paraboloidal mirror, it is difficult to realize effective application.Ji xu in 2018 proposes a kind of negative refraction grating that focal length is controllable
The design method of plano-concave lens can carry out the tightly focused of sub-wavelength dimensions to radial polarisation light and rotation direction polarised light.Due to this
Kind negative refraction plano-concave lens is not very ideal to the focusing effect of polarised light, therefore saturating for such negative refraction grating plano-concave
The structure of mirror proposes a kind of glittering type negative refraction grating lens that can enhance focusing effect.
Utility model content
The purpose of the utility model is to overcome deficiencies in the prior art, provide a kind of long focusing glittering type negative refraction light
Grid lens.
It is a kind of it is long focus glittering type negative refraction grating lens, the lens include negative refraction grating and glittering ladder, described
The concentric ring ladder that negative refraction grating is equal by height, radius is gradually incremented by from inside to outside forms, and the glittering ladder is by being located at
The annular cone composition of the concentric ring stepped surfaces；
When radial polarisation light impinges perpendicularly on the lens interior from bottom, radial polarisation light is in every level-one concentric ring rank
Diffraction occurs for the surface of ladder, and the glittering ladder can change the diffraction time of the radial polarisation light of stepped surfaces outgoing, make to bear
First-order diffraction light focuses on scheduled focal position, enhances the utilization efficiency of energy, so that the lens be made to realize sub-wavelength ruler
Very little focusing.
Preferably, the ladder apex coordinate r of the concentric ring laddernMeet；Wherein: n0For air refraction, neffFor equivalent negative index, znIt is same
The vertical height nd, f of thimble ladder to bottom surface are scheduled focal position.
Preferably, the equivalent negative index meets neff=ng- λ/d, ngFor the refractive index of gallium nitride, refractive index is
2.67, by the way that equivalent negative index n is calculatedeff=-1.067, in which: λ is that the optical wavelength 562nm, d focused is concentric ring
Ladder single layer height 150nm.
Preferably, the vertical height positioned at the annular cone of the concentric ring stepped surfaces is d, annular cone width and ladder
Face width is equal, is equivalent to the difference of the coordinate of neighboring concentric loop order ladder top point, width wnMeet:Wherein:
n0For air refraction, neffFor equivalent negative index, znFor the vertical height nd, r of concentric ring ladder to bottom surfacenFor concentric loop order
The ladder apex coordinate of ladder.
Preferably, a structural unit of the single layer ladder of the concentric ring ladder and annular cone composition negative refraction grating,
Total unit number N is 30.
Preferably, the cone bottom half width of the annular cone meets wn=rn-rn-1, wherein rnFor the ladder of concentric ring ladder
Apex coordinate.
Compared with prior art, the utility model is achieved the utility model has the advantages that the utility model structure simply easily designs, material
Material obtain be easy, when light from bottom vertically into structure when, structure exit surface occur diffraction, light is effectively focused on to institute
Preset focal point, is effectively utilized luminous energy, has extremely strong focusing effect.Described in the utility model is a kind of focusing
Device has certain application value in fields such as super-resolution is micro-, micro-nano technology and optical tweezers.
Detailed description of the invention
Fig. 1 is the schematic diagram of the section structure of the utility model；
Fig. 2 is the space structure schematic diagram of the utility model annular cone；
Focusing simulation result of the plano-concave mirror to radial polarisation light when Fig. 3 presets f=7 μm of focal length for negative refraction grating concavees lens
Electric field distribution of contours figure；
Plano-concave mirror is to the focusing of radial polarisation light along z-axis when Fig. 4 presets f=7 μm of focal length for negative refraction grating concavees lens
Electric field mould square energy distribution curve；
Fig. 5 is that plano-concave mirror is imitative to the focusing of radial polarisation light when glittering type negative refraction grating concavees lens preset f=7 μm of focal length
True result electric field distribution of contours figure；
Focusing edge of the plano-concave mirror to radial polarisation light when Fig. 6 presets f=7 μm of focal length for glittering type negative refraction grating concavees lens
The electric field mould square energy distribution curve of z-axis；
Fig. 7 is general negative refraction grating concavees lens and glittering type negative refraction grating concavees lens when f=7 μm of focal length default
Plano-concave mirror is to the focusing of radial polarisation light along the electric field mould square Energy distribution correlation curve of z-axis.
Specific embodiment
The utility model is further described with reference to the accompanying drawing.Following embodiment is only used for clearly illustrating this
The technical solution of utility model, and cannot be used as a limitation the limitation protection scope of the utility model.
It should be noted that in the description of the present invention, term "front", "rear", "left", "right", "upper", "lower",
The orientation or positional relationship of the instructions such as "inner", "outside" is to be merely for convenience of based on orientation or positional relationship shown in the drawings
Description the utility model rather than require the utility model that must be constructed and operated in a specific orientation, therefore should not be understood as pair
The limitation of the utility model.Term "front", "rear" used in the utility model description, "left", "right", "upper", "lower" refer to
It is the direction in attached drawing, term "inner", "outside" refer respectively to the direction towards or away from geometric center of specific component.
As shown in figs. 1-7, a kind of long focusing glittering type negative refraction grating lens, the lens include negative refraction grating and sudden strain of a muscle
Credit ladder, the concentric ring ladder 1 that the negative refraction grating is equal by height, radius is gradually incremented by from inside to outside form, the sudden strain of a muscle
Credit ladder is made of the annular cone 2 for being located at 1 surface of concentric ring ladder；
When radial polarisation light impinges perpendicularly on the lens interior from bottom, radial polarisation light is in every level-one concentric ring rank
Diffraction occurs for the surface of ladder 1, and the glittering ladder can change the diffraction time of the radial polarisation light of stepped surfaces outgoing, make to bear
First-order diffraction light focuses on scheduled focal position, enhances the utilization efficiency of energy, so that lens be made to realize sub-wavelength dimensions
It focuses.
In the present embodiment, the ladder apex coordinate r of the concentric ring laddernMeet；Wherein: n0For air refraction, neffFor equivalent negative index, znIt is same
The vertical height nd, f of thimble ladder to bottom surface are scheduled focal position, specifically, negative refraction grating lens, equivalent negative folding
The rate of penetrating meets neff=ng-λ/d⊥, wherein ngFor the refractive index 2.67 of gallium nitride, lambda1-wavelength λ is its value of lambda1-wavelength
For 562nm, d⊥For 1 single layer height 150 of concentric ring ladder, therefore its equivalent negative refraction interest rate is neff=-1.067.Each is same
The coordinate position r on 1 vertex of thimble laddernIt is determined by following formula, wherein znRelationship with n is z1=d⊥,z2=2d⊥,z3=
3d⊥..., zn=nd⊥, each znThere is corresponding rn:
Wherein n0For air refraction, neffFor equivalent negative index, zn
Indicate n-th layer grating total height, and zn=nd⊥, n is the positive integer for being less than or equal to 30 greater than 0, neffFor equivalent negative refraction interest rate
Its value is that -1.067, f is scheduled focal position, takes 7 μm herein.
Using the one-to-one relationship of r and z that equivalent negative index combination Fermat's principle is calculated, design parameter is by table
1 provides.
1 negative refraction grating lens concave surface topographic data of table (unit is μm)
The plano-concave lens structure obtained using table 1, for radial polarisation light ErThe focusing electric field distribution of contours of=1V/M
As shown in Figure 3.Fig. 4 is to the focusing of radial polarisation light with the negative refraction grating concavees lens of this design of Structural Parameters along 5 μm -9 of z-axis
Electric field mould square energy distribution curve figure at μm, wherein ordinate indicates electric field energy, and abscissa indicates z-axis.
In the present embodiment, the equivalent negative index meets neff=ng-λ/d⊥, ngFor the refractive index of gallium nitride, folding
Penetrating rate is 2.67, by the way that equivalent negative index n is calculatedeff=-1.067, in which: λ is that the optical wavelength 562nm, d focused is
The design parameter of 1 single layer height 150nm of concentric ring ladder, annular cone 2 are provided by table 2.
The annular wimble structure data of table 2 (unit is μm)
The glittering type negative refraction grating concavees lens structure to be formed is constructed in negative refraction grating concave lens surface using table 2, it is right
In radial polarisation light ErThe focusing electric field distribution of contours of=1V/M is as shown in figure 5, can be it has been observed that increase annular from figure
The isopleth for boring near focal point after 2 structures is more intensive, and focusing effect is enhanced.
In the present embodiment, the vertical height positioned at the annular cone 2 on 1 surface of concentric ring ladder is d, such as Fig. 1 institute
Show, from cross-section, annular cone 2 at 1 surface of concentric ring ladder of every level-one at right angled triangle, right-angle side with should
Grade concentric ring 1 vertical plane of ladder is parallel, and annular cone 2 is the center point straight line parallel with right-angle side around it by a right angled triangle
Rotate a circle obtained rotation body structure, and annular 2 width of cone are equal with stepped surfaces width, is equivalent to neighboring concentric loop order ladder
The difference of the coordinate on 1 vertex, width wnMeet:Wherein:
n0For air refraction, neffFor equivalent negative index, znFor the vertical height nd, r of concentric ring ladder to bottom surfacenFor concentric loop order
The ladder apex coordinate of ladder 1.
In the present embodiment, a knot of 2 composition negative refraction grating of the single layer ladder of the concentric ring ladder 1 and annular cone
Structure unit, total unit number N are 30, and the cone bottom half width of the annular cone 2 meets wn=rn-rn-1, wherein rnFor concentric loop order
1 apex coordinate of ladder of ladder, Fig. 6 are the glittering type negative refraction grating concavees lens with this design of Structural Parameters to radial polarisation light
The electric field mould square energy distribution curve figure at 5 μm -9 μm of z-axis is focused, wherein ordinate indicates electric field energy, abscissa table
Show z-axis.
Fig. 7 is with unstructured pre-structure focusing effect comparison diagram after building annular is bored, and wherein ordinate indicates electric field energy
Amount, abscissa indicate z-axis.It is possible thereby to observe to obtain construct annular cone after the focusing effect of structure significantly increase, pre-
7 μm of fixed focal points, electric field energy enhance about 3 times, in a limited space scale, and field space-focusing realizes stronger poly-
Burnt performance, this structure have very strong application value in fields such as super-resolution is micro-, micro-nano technology and optical tweezers.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without deviating from the technical principle of the utility model, several improvement and deformations can also be made, these change
It also should be regarded as the protection scope of the utility model into deformation.
Claims (6)
1. a kind of long focusing glittering type negative refraction grating lens, which is characterized in that the lens include negative refraction grating and glittering
Ladder, the concentric ring ladder that the negative refraction grating is equal by height, radius is gradually incremented by from inside to outside form, the glittering rank
Ladder is made of the annular cone for being located at the concentric ring stepped surfaces；
When radial polarisation light impinges perpendicularly on the lens interior from bottom, radial polarisation light is in every level-one concentric ring ladder
Diffraction occurs for surface, and the glittering ladder can change the diffraction time of the radial polarisation light of stepped surfaces outgoing, make negative one grade
Diffraction light focuses on scheduled focal position, enhances the utilization efficiency of energy, so that the lens be made to realize sub-wavelength dimensions
It focuses.
2. long focusing glittering type negative refraction grating lens according to claim 1, which is characterized in that the concentric ring ladder
Ladder apex coordinate rnMeet；Wherein: n0For air refraction, neff
For equivalent negative index, znIt is scheduled focal position for the vertical height nd, f of concentric ring ladder to bottom surface.
3. long focusing glittering type negative refraction grating lens according to claim 2, which is characterized in that the equivalent negative refraction
Rate meets neff=ng- λ/d, ngFor the refractive index of gallium nitride, refractive index 2.67, by the way that equivalent negative index is calculated
neff=-1.067, in which: λ is that the optical wavelength 562nm, d focused is concentric ring ladder single layer height 150nm.
4. long focusing glittering type negative refraction grating lens according to claim 1, which is characterized in that be located at the concentric ring
The vertical height of the annular cone of stepped surfaces is d, and annular cone width is equal with stepped surfaces width, is equivalent to neighboring concentric ring
The difference of the coordinate on ladder vertex, width wnMeet:Wherein:
n0For air refraction, neffFor equivalent negative index, znFor the vertical height nd, r of ladder to bottom surfacenFor the rank of concentric ring ladder
Terraced apex coordinate.
5. long focusing glittering type negative refraction grating lens according to claim 1, which is characterized in that the concentric ring ladder
Single layer ladder and annular cone composition negative refraction grating a structural unit, total unit number N be 30.
6. long focusing glittering type negative refraction grating lens according to claim 1, which is characterized in that the cone of the annular cone
Bottom half width meets wn=rn-rn-1, wherein rnFor the ladder apex coordinate of concentric ring ladder.
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| CN201920308978.2U CN209590317U (en) | 2019-03-12 | 2019-03-12 | A kind of long focusing glittering type negative refraction grating lens |
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| CN201920308978.2U CN209590317U (en) | 2019-03-12 | 2019-03-12 | A kind of long focusing glittering type negative refraction grating lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111913298A (en) * | 2019-05-08 | 2020-11-10 | 南京邮电大学 | Focal length controllable blazed negative refraction grating lens and design method thereof |
| CN111965746A (en) * | 2020-08-13 | 2020-11-20 | 南京邮电大学 | All-dielectric plano-concave focusing lens with suppressed hollow secondary focus |
-
2019
- 2019-03-12 CN CN201920308978.2U patent/CN209590317U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111913298A (en) * | 2019-05-08 | 2020-11-10 | 南京邮电大学 | Focal length controllable blazed negative refraction grating lens and design method thereof |
| CN111913298B (en) * | 2019-05-08 | 2022-04-05 | 南京邮电大学 | Focal length controllable blazed negative refraction grating lens and design method thereof |
| CN111965746A (en) * | 2020-08-13 | 2020-11-20 | 南京邮电大学 | All-dielectric plano-concave focusing lens with suppressed hollow secondary focus |
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