CN110488420A - Surpass the multifocal optical fiber lens on surface based on all dielectric - Google Patents
Surpass the multifocal optical fiber lens on surface based on all dielectric Download PDFInfo
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- CN110488420A CN110488420A CN201910617694.6A CN201910617694A CN110488420A CN 110488420 A CN110488420 A CN 110488420A CN 201910617694 A CN201910617694 A CN 201910617694A CN 110488420 A CN110488420 A CN 110488420A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/262—Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements
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Abstract
The present invention relates to a kind of multifocal optical fiber lens for surpassing surface based on all dielectric, belong to optical technical field.Including multimode fibre, all dielectric film is plated in the fibre core of multimode fibre and covering end face, multiple micro-nano bar shaped resonant element structures are inscribed on the deielectric-coating near fibre core using optics micro-processing technology, light beam is incident on the electric dipole generated on dielectric resonance unit and magnetic dipole resonance causes Michaelis resonance, optical fiber lens regulate and control outgoing beam using Michaelis resonance, that is addition mutation phase, the additive phase of outgoing beam by single resonant element size and structure determination, the permutation and combination for focusing the bar shaped resonant element of multiple focuses is realized using Insertion method or zone method, to meet the additive phase distribution of multiple focal points.Multifocal optical fiber lens of the present invention can generate multiple axial focusing focuses simultaneously, and be not required to the equipment series of immobilising device, small in size, and stability is high, high-efficient, it is easy to accomplish all -fiber is integrated, is of great significance in fields such as light captures.
Description
Technical field
The present invention relates to a kind of multifocal optical fiber lens for surpassing surface based on all dielectric, belong to optical technical field.
Background technique
Beam shaping can provide various unusual beam profiles, in the micro- capture of optics, hologram image and light beam
It plays an important role in the fields such as focusing, has become research hotspot at present.Traditional optical lens can to light beam carry out deviation,
The functions such as diverging and convergence.But its size is big, and it is integrated to be unfavorable for optics.In addition, diffraction optical element can also to light beam into
Row regulation, but color difference, multiple orders of diffraction can be generated, cause unnecessary optical loss.Metal surface plasma body can be
The thickness realization of Nano grade manipulates light beam completely, integrated conducive to optics, but the utilization so that light is lost in the inherent of metal
Efficiency is too low, and light beam deviation, reflection and the efficiency of focusing are unsatisfactory.Reduced Dimension Structure of the super surface of all dielectric as Meta Materials,
Design is simple, matches present production process, can be regulated and controled completely to light beam, high-efficient, the optical device on the super surface of all dielectric
It is receive more and more attention.
Michaelis resonance is one caused by light and electric dipole and magnetic dipolar interaction in all dielectric nano particle
Kind dipole resonance, in this interaction, incident light can change itself polarization, amplitude and phase.Pass through electric dipole
It interacts between magnetic dipole, can be realized the active manipulation to light propagation.Resulting emergent light, which can overcome, to spread out
Emitter-base bandgap grading limit generates many novel optical phenomenas, such as the imaging of negative refraction, ultrahigh resolution, transmission enhancing, wavefront shaping.Entirely
The super surface of medium has apparent advantage in terms of the photonic device of exploitation miniaturization.But it is based on the super table of conventional waveguide all dielectric
Accurate alignment device is needed when the optical device application in face, needs the equipment series of immobilising device, light oblique incidence also can shadow
The performance of Chinese percussion instrument part.The flexibility that optical fiber has had, long transmission range, all dielectric is surpassed that surface and optical fiber combines will more
Integrated conducive to optical system, the volume of device is greatly reduced.Also there is report based on the lens that all dielectric surpasses surface, but most
To focus single focus, limit its scope of application.
Summary of the invention
The purpose of the invention is to which all dielectric is surpassed surface and the multiple axial focusing focuses of optical fiber combination generation, to light beam
Regulated and controled completely and a kind of multifocal optical fiber lens for being surpassed surface based on all dielectric are provided.
The object of the present invention is achieved like this: surpassing the multifocal optical fiber lens on surface, including multimode light based on all dielectric
All dielectric film is plated in fibre, the fibre core of multimode fibre and covering end face, and all dielectric film surface on core end surface is carved with micro-nano bar shaped
Resonant element structure, micro-nano bar shaped resonant element structure are to realize permutation and combination using Insertion method or zone method.
The invention also includes structure features some in this way:
1, the height of the micro-nano bar shaped resonant element structure is identical as all dielectric film thickness, design parameter are as follows: film thickness 400-
700 nanometers, the width of medium strip is 50-400 nanometers, and the resonant element period is 400-800 nanometers.
2, the bar shaped resonant element structure is the periods such as contour in an optical fiber lens, but media units structure is wide
Degree is different, and the width of each media units structure is by formulaCalculate the phase of the point
Position, then go to match corresponding width, m is positive integer in formula, and x is distance of each resonant element apart from core centre,It is
The mutation phase of the position, f are the focal lengths of design, and λ is the wavelength of incidence wave, and f takes different values, corresponding different focus.
3, the bar shaped resonant element structure is distributed by end centre of optic fibre's axial symmetry.
4, the Insertion method is: gradually arranging the single bar shaped resonant element for acting on different focal point；The zone method
It is: fiber core end face is divided into several regions, different area arrangements acts on multiple bar shaped resonance lists of different focal point
Member.
5, all dielectric film is amorphous silicon or TiO2Material.
6, the core diameter is 50-100 microns, and cladding diameter is 125 microns.
Compared with prior art, the beneficial effects of the present invention are: multifocal optical fiber lens can be simultaneously using single layer structure
Multiple axial focusing focuses are generated, are of great significance in fields such as light captures；The present invention is based on all dielectrics to surpass the multifocal of surface
Point optical fiber lens are small in size, and integrated level is high, high-efficient, it is easy to accomplish all -fiber is integrated, can carry out with existing fiber technology mutual
Connection, is of great significance in micro-optical device；Simultaneously because the flexibility of optical fiber itself, which is not required to immobilising device
Equipment series are easy to practical operation, improve the stability of device.
Detailed description of the invention
Fig. 1 (a) is multimode fibre cross section；Fig. 1 (b) is the single focus optical fiber lens structure for surpassing surface based on all dielectric
Figure；
Fig. 2 (a) is bar shaped resonant element Insertion method arrangement schematic diagram；Fig. 2 (b) is that the arrangement of bar shaped resonant element zone method is shown
It is intended to；
Fig. 3 (a) is the phase for surpassing the single focus optical fiber lens on surface based on all dielectric and the position distribution of resonant element
Figure；Fig. 3 (b) is the simulated effect figure for surpassing the single focus optical fiber lens on surface based on all dielectric；
Fig. 4 (a) is to surpass the phase of bifocus optical fiber lens on surface and humorous based on all dielectric using Insertion method design
The location map of vibration unit；Fig. 4 (b) is the bifocus optical fiber lens for surpassing surface based on all dielectric using Insertion method design
Simulated effect figure；
Fig. 5 (a) is to surpass the phase of bifocus optical fiber lens on surface and humorous based on all dielectric using zone method design
The location map of vibration unit；Fig. 5 (b) is the bifocus optical fiber lens for surpassing surface based on all dielectric using zone method design
Simulated effect figure；
Fig. 6 is the three focus optical fiber lens simulated effect figures for surpassing surface based on all dielectric.
Specific embodiment
Present invention is further described in detail with specific embodiment with reference to the accompanying drawing.
The purpose of the present invention is to provide a kind of multifocal optical fiber lens for surpassing surface based on all dielectric.The device is by multimode
Fiber end face plates all dielectric film, and then all dielectric film surface using optics micro-processing technology on core end surface inscribes micro-nano
Bar shaped resonant element structure.Its working principle is that Michaelis resonance is based on, using the dipole resonance of bar shaped resonant element to fibre core
Light addition mutation phase, then be emitted to free space.Multiple resonant elements have different degree of modulation to light beam, thus
The wavefront of entire effect outgoing beam.
Surpass the multifocal optical fiber lens on surface based on all dielectric, multimode fibre end face fiber core 1 and covering 2 plate all dielectric
Film, then all dielectric film surface using optics micro-processing technology on core end surface inscribes micro-nano bar shaped resonant element structure
3, the permutation and combination for focusing the bar shaped resonant element of multiple focuses is realized using Insertion method or zone method, optical fiber can produce simultaneously
Raw multiple axial focusing focuses.The height of bar shaped resonant element 3 is identical as medium film thickness, and 400-700 nanometers of film thickness, medium strip
50-400 nanometers of width；The resonant element period is 400-800 nanometers.One optical fiber lens interior resonance unit 3 is contour isoperimetric
Phase, but media units width is different, and then obtains different size of mutation phase, realizes that the light beam of different focal length is poly-
It is burnt.The width of each bar shaped resonant element 3 is by formulaMutation phase is calculated, then
Find out its corresponding width.Wherein m is positive integer, and x is distance of n-th of resonant element apart from fibre core,It is the prominent of the point
Changeable phases, f are the focal lengths of design, and λ is the wavelength of incident beam.The optical fiber lens can not only focus a focus, can also
To focus the focus of two and more than two quantity simultaneously.To realize that the light beam of multiple focuses focuses, f is taken more in phase formula
A value needs to calculate multiple phase distribution curves.Medium is amorphous silicon or TiO2Contour index dielectric material.Described
The diameter of multimode fibre fibre core 1 is 50-100 microns, and 125 microns of 2 diameter of covering, 1 end face of fibre core is sufficiently large, can put foot
Enough bar shaped resonant elements carry out efficient manipulation light beam.Bar shaped resonant element 3 on the core end surface is according in fibre core
Mandrel line is symmetrical, to cause different additive phases, can focus the focus of two and more than two quantity simultaneously.
The Insertion method, which refers to, gradually arranges the single bar shaped resonant element for acting on different focal point；And zone method is optical fiber
Core end surface is divided into several regions, and different area arrangements acts on multiple bar shaped resonant elements without focus.Multifocal
Optical fiber lens can work in visible light and near infrared light wave band.
Embodiment 1:
Surpass the single focus optical fiber lens on surface based on all dielectric, attached drawing 1 (a) is multimode fibre cross section；It (b) is based on complete
The single focus optical fiber lens structure chart on the super surface of medium；Attached drawing 3 (a) is the single focus optical fiber lens for surpassing surface based on all dielectric
Phase and resonant element location map；Multimode fibre end face fiber core 1 and covering 2 plate the amorphous silicon of 600nm thickness
Then film carves multiple a height of 600nm, period 500nm, length using focused ion beam technology respectively on the end face of fibre core 1
Cover the bar shaped resonant element 3 of fiber core.Bar shaped resonant element 3 is according to fiber core distribution substantially symmetrical about its central axis, each medium
The width of structure is by formulaMutation phase is calculated, then finds out its corresponding width.
Wherein m is positive integer, and x is distance of each resonant element apart from core centre,It is the additive phase of the position, f is burnt
Away from λ is the wavelength of incident beam.When f=100 μm, shown in the arrangement of bar shaped resonant element such as Fig. 1 (b), first according to design
It is required that calculate phase distribution curve, as shown in Fig. 3 (a), the position as resonant element then is taken every 500nm, no
Dielectric structure additive phase obtained with width will meet Fig. 3 (a) phase distribution curve, and bar shaped resonant element all acts on
In single focus.Wavelength is 1300nm, and the light that polarization state is parallel to medium strip direction is incident, what whens 117 dielectric structures calculated
Field distribution such as Fig. 3 (b).It can be seen that having a focus at 100 microns of far field, single focus focusing is realized.
Embodiment 2:
It is utilized respectively the bifocus optical fiber lens for surpassing surface based on all dielectric of Insertion method and zone method design, attached drawing 2 (a)
It is bar shaped resonant element Insertion method arrangement schematic diagram；3-1 focuses f1, and 3-2 focuses f2, is (b) bar shaped resonant element zone method row
List intention；3-1 focuses f1, and 3-2 focuses f2；Attached drawing 4 (a) is to surpass the double of surface based on all dielectric using Insertion method design
The phase of focus optical fiber lens and the location map of resonant element；It (b) is to utilize the super based on all dielectric of Insertion method design
The simulated effect figure of the bifocus optical fiber lens on surface；Attached drawing 5 (a) is to surpass surface based on all dielectric using zone method design
Bifocus optical fiber lens phase and resonant element location map；It (b) is being situated between based on complete using zone method design
The simulated effect figure of the bifocus optical fiber lens on the super surface of matter；Multimode fibre end face fiber core 1 and covering 2 plate the non-of 600nm thickness
Then crystal silicon film carves multiple a height of 600nm, period 500nm using focused ion beam technology respectively on the end face of fibre core 1,
The bar shaped resonant element 3 of length covering fiber core.Bar shaped resonant element 3 is according to fiber core distribution substantially symmetrical about its central axis, each
The width of dielectric structure is by formulaMutation phase is calculated, then finds out its corresponding width
Degree.Wherein m is positive integer, and x is distance of each resonant element apart from core centre,It is the additive phase of the position, f
It is focal length, λ is the wavelength of incident beam.When f=50 μm and 100 μm, the arrangement of bar shaped resonant element can be according to two kinds not
Same method: Insertion method and the zone method as shown in Fig. 2 (b) as shown in Fig. 2 (a).Insertion method refers to acting on different cokes
The single bar shaped resonant element of point gradually arranges, and as shown in Fig. 4 (a), it is humorous that the single bar shaped for focusing 50 μm is put in the 1st position
Shake unit 3-1, and the single bar shaped resonant element 3-2 for focusing 100 μm is just put in the 2nd position, and the 3rd position is put single poly-
Burnt 50 μm of bar shaped resonant element 3-1, the single bar shaped resonant element 3-2 for focusing 100 μm is just put in the 4th position, with such
It pushes away；And zone method is exactly that fiber core end face is divided into several regions, different area arrangements acts on the more of different focal point
A bar shaped resonant element puts multiple 50 μm of focusing as shown in Fig. 5 (a) in one section of region being closer from core centre
Bar shaped resonant element 3-1, put in one section of region farther away with a distance from core centre it is multiple focus 100 μm bar shapeds it is humorous
Shake unit 3-2.The 1300nm light that polarization state is parallel to medium strip direction is incident, when 117 dielectric structures, based on Insertion method and
Far field based on zone method is respectively as shown in Fig. 4 (b) and 5 (b).It can be seen that occurring coke simultaneously at 50 microns and 100 microns
Point realizes axial bifocal point focusing.
Embodiment 3:
In conjunction with the three focus optical fiber lens for surpassing surface based on all dielectric that Insertion method and zone method design, attached drawing 2 (a) is item
Shape resonant element Insertion method arranges schematic diagram；3-1 focuses f1, and 3-2 focuses f2, is (b) that the arrangement of bar shaped resonant element zone method is shown
It is intended to；3-1 focuses f1, and 3-2 focuses f2；Attached drawing 6 is the three focus optical fiber lens simulated effect figures for surpassing surface based on all dielectric；
Multimode fibre end face fiber core 1 and covering 2 plate the amorphous silicon film of 600nm thickness, then using focused ion beam technology in fibre core 1
End face on carve multiple a height of 600nm respectively, period 500nm, length covers the bar shaped resonant element 3 of fiber core.Bar shaped
Resonant element 3 is according to fiber core distribution substantially symmetrical about its central axis, and the width of each dielectric structure is by formulaMutation phase is calculated, then finds out its corresponding width.Wherein m is positive integer, and x is
Distance of each resonant element apart from core centre,It is the additive phase of the position, f is focal length, and λ is incident beam
Wavelength.When f=100 μm, 150 μm and 250 μm, the arrangement of bar shaped resonant element can in conjunction with such as Fig. 2 (a) Insertion method and
Such as the zone method of Fig. 2 (b).Intert subregion on core end surface: in (the other side arrangement pair of the region of the side of core centre point 6
Claim structure), first three region successively acts on 100 μm, 150 μm and 250 μm, and rear three regions arrange in the same fashion
Bar shaped resonant element.The 1300nm light that polarization state is parallel to medium strip direction is incident, the field point that whens 117 dielectric structures calculates
Cloth such as Fig. 6.It can be seen that there is focus simultaneously at 52 μm, 88 μm and 139 μm, axial three focal points are realized.
To sum up, the present invention provides a kind of multifocal optical fiber lens for surpassing surface based on all dielectric, the device is by multimode light
Deielectric-coating is plated in fine end face, and it is humorous that multiple micro-nano bar shapeds are then inscribed on the deielectric-coating near fibre core using optics micro-processing technology
Shake cellular construction.Light beam is incident on the electric dipole generated on dielectric resonance unit and magnetic dipole resonance and causes Michaelis humorous
Vibration, optical fiber lens regulate and control outgoing beam using Michaelis resonance, i.e. addition mutation phase.The additive phase of outgoing beam
It is determined by the size and structure of single resonant element, multifocal optical fiber lens are using Insertion method or zone method in core end surface
The design of resonant element distribution is carried out, to meet the additive phase distribution of multiple focal points.The multifocal optical fiber lens can be same
When generate multiple axial focusing focuses, it is not needed using the biggish Spatial Phase Modulator of volume, and it is accurate right also not need
Standard apparatus is integrated into simple optical fiber waveguide, and the volume of device is greatly reduced, and due to the flexibility of optical fiber, the probe is not
The equipment series for needing immobilising device have important application in optics is integrated.
Claims (9)
1. surpassing the multifocal optical fiber lens on surface based on all dielectric, it is characterised in that: including multimode fibre, the fibre core of multimode fibre
All dielectric film is plated with covering end face, all dielectric film surface on core end surface is carved with micro-nano bar shaped resonant element structure, micro-nano
Bar shaped resonant element structure is to realize permutation and combination using Insertion method or zone method.
2. surpassing the multifocal optical fiber lens on surface based on all dielectric according to claim 1, it is characterised in that: the micro-nano item
The height of shape resonant element structure is identical as all dielectric film thickness, design parameter are as follows: and 400-700 nanometers of film thickness, the width of medium strip
It is 50-400 nanometers, the resonant element period is 400-800 nanometers.
3. the multifocal optical fiber lens according to claim 1 or claim 2 for surpassing surface based on all dielectric, it is characterised in that: the item
Shape resonant element structure is the contour equal periods in an optical fiber lens, but media units structure width is different, each medium
The width of cellular construction is by formulaThe phase of the point is calculated, then goes matching corresponding
Width, m is positive integer in formula, and x is distance of each resonant element apart from core centre,It is the mutation phase of the position, f
It is the focal length of design, λ is the wavelength of incidence wave, and f takes different values, corresponding different focus.
4. surpassing the multifocal optical fiber lens on surface based on all dielectric according to claim 3, it is characterised in that: the bar shaped is humorous
The cellular construction that shakes is distributed by end centre of optic fibre's axial symmetry.
5. the multifocal optical fiber lens according to claim 1 or claim 2 for surpassing surface based on all dielectric, it is characterised in that: described to wear
Slotting method is: gradually arranging the single bar shaped resonant element for acting on different focal point；The zone method is: by fiber core end face
It is divided into several regions, different area arrangements acts on multiple bar shaped resonant elements of different focal point.
6. surpassing the multifocal optical fiber lens on surface based on all dielectric according to claim 3, it is characterised in that: the Insertion method
It is: the single bar shaped resonant element for acting on different focal point is gradually arranged；The zone method is: fiber core end face is divided into
Several regions, different area arrangements act on multiple bar shaped resonant elements of different focal point.
7. surpassing the multifocal optical fiber lens on surface based on all dielectric according to claim 4, it is characterised in that: the Insertion method
It is: the single bar shaped resonant element for acting on different focal point is gradually arranged；The zone method is: fiber core end face is divided into
Several regions, different area arrangements act on multiple bar shaped resonant elements of different focal point.
8. surpassing the multifocal optical fiber lens on surface based on all dielectric according to claim 7, it is characterised in that: all dielectric
Film is amorphous silicon or TiO2Material.
9. surpassing the multifocal optical fiber lens on surface based on all dielectric according to claim 8, it is characterised in that: the fibre core is straight
Diameter is 50-100 microns, and cladding diameter is 125 microns.
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| CN111025466A (en) * | 2019-12-27 | 2020-04-17 | 桂林电子科技大学 | Multi-focus diffraction lens based on optical fiber |
| CN113687453A (en) * | 2021-07-27 | 2021-11-23 | 华南理工大学 | Variable-focus near-infrared super-surface lens and control method thereof |
| CN114460691A (en) * | 2022-02-21 | 2022-05-10 | 杭州纳境科技有限公司 | Optical fiber-micro-nano structure integrated element and functional optical fiber array |
| CN115327696A (en) * | 2022-08-11 | 2022-11-11 | 武汉理工大学 | Tunable reflector of hollow anti-resonance optical fiber |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111025466A (en) * | 2019-12-27 | 2020-04-17 | 桂林电子科技大学 | Multi-focus diffraction lens based on optical fiber |
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| CN115327696A (en) * | 2022-08-11 | 2022-11-11 | 武汉理工大学 | Tunable reflector of hollow anti-resonance optical fiber |
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