CN106681026B - Random polarization dynamic regulation device and method based on super clever surface-phase-change material - Google Patents
Random polarization dynamic regulation device and method based on super clever surface-phase-change material Download PDFInfo
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0136—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour for the control of polarisation, e.g. state of polarisation [SOP] control, polarisation scrambling, TE-TM mode conversion or separation
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Abstract
The present invention relates to a kind of random polarization dynamic regulation devices and method based on super clever surface-phase-change material, belong to micronano optical applied technical field.Using a kind of super clever surface based on V-type nanotube antenna array, surface phase gradient can be generated with light field effect, leads to the abnormal transmission-polarizing light tilted off surface normal direction produced in the case of linearly polarized light normal incidence；Meanwhile the interval modulation layer that the Ge-Sb-Te GST to be arranged by the period is constituted is introduced, it is superimposed in the phase difference of the orthogonal polarisation state of extrinsic motivated modulated difference subelement outgoing, and in spatial coherence, to realize the random polarization state synthesis of optical output field.This method is a kind of all solid state modulator approach, does not need the mechanics modulation means such as any stretching or rotation, can be realized the separation of gained random polarization light and background light beam, to avoid cross-talk.This method provides a kind of flexible control measures for the on piece polarization application of integrated optics.
Description
Technical field
The present invention relates to a kind of random polarization dynamic regulation devices and method based on super clever surface-phase-change material, belong to
Micronano optical applied technical field.
Background technique
Polarization state is the essential attribute of electromagnetic wave.The polarization state for controlling electromagnetic wave, realizes any conversion of different polarization states
In optoelectronic communication, bio-sensing, accurate measurement, the fields such as remote sensing are all had a wide range of applications.Traditional Polarization Modulation means
The birefringent mineral crystal such as anisotropic material, such as quartz, calcite is depended on, rotating crystal optical axis and incidence are passed through
The angle of polarization state, to control the regulation that the phase difference between ordinary light and non-ordinary light realizes polarization state.Conventional geometric optics
Method has been no longer desirable for the fields such as the integrated optics risen in recent years and planar wave, and in device miniaturization, micromation is integrated
Etc. encounter difficulty.
The micromation of traditional optical component is solved, a feasible way of integrated difficulty is to utilize super clever surface.It is super clever
Surface is made of the sub-wavelength size metallic of sophisticated design or media units two-dimensional array, and thickness is much smaller than wavelength.Pass through
Structure design, super clever surface can planar change the scattered field of single pixel point by point, to corresponding scattered amplitude, phase or
Polarization state is controlled, the final any regulation realized to entire transmitted field.The regulation to polarization state is realized using super clever surface
Attract extensive research interest, it, can be with by the structure of sophisticated design single layer or multi-layered anisotropic metamaterial unit
Obtain the regulation and control scheme of a variety of polarization states, such as: using complementary apertures type structure can manufacture terahertz wave band ultrathin type four/
One wave plate Opt.Express.23,11114 (2015)；It can realize that broadband is inclined in microwave band using the double-deck super clever surface texture
Vibration conversion J.Appl.Phys.117,44501 (2015)；The parameter of three layers of anisotropic structure of careful design, may be implemented to specify
Polarization conversion Phys.Rev.Applied.2,044011 (2014).However reported super clever surface polarization converter device its
Optical characteristics is difficult to realize dynamic regulation, i.e., its optical characteristics is completely fixed after device manufacture finishes, and can be only done a certain
Specified polarization adjusting function, which has limited its applications.
The adjustable super grain husk of dynamic may be implemented in conjunction with phase-change material and using modulator approaches such as suitable calorifics, optics, electricity
Surface.As a kind of phase-change material, Ge-Sb-Te (germanium antimony tellurium, GeSbTe, GST) is nearest
It is widely paid close attention in research.Wherein Ge3Sb2Te6(GST-326, GST) is widely used in middle infrared band, for example, by using
GST realizes adjustable nano-antenna resonance Nano Lett.13,3470 (2013)；Dynamic tunable chiral material is realized using GST thin layer
Expect Nano Lett.15,4255 (2015).It can realize that stabilization can repeated dynamic adjustable device using phase-change material GST.
But it is mainly adjusted using uniform GST thin layer in current document, and realizes the adjustable polarization converter of dynamic using GST
Attention is not yet received in part.
Summary of the invention
The problem of being difficult to realize dynamic polarization regulation the purpose of the present invention is to solve current super clever surface polarizer,
A kind of random polarization dynamic regulation device and method based on super clever surface-phase-change material is provided.
The present invention is achieved through the following technical solutions.
Based on the random polarization dynamic regulation device of super clever surface-phase-change material, the device composite construction is by V-type nanometer day
Line layer, interval modulation layer and basal layer are constituted.The each periodic unit of V-type nano-antenna layer includes two parts subelement, and son is single
Member is made of the V-type nanotube antenna array with different arrangement modes, and two parts subelement is generating polarization direction mutually just respectively
The linear polarization of friendship scatters light.The V-type nanotube antenna array has certain surface phase gradient, so that score polarization scattering light
The direction of propagation deviate incident direction, that is, surface normal direction is no longer normal to, to reduce the cross-talk of bias light.It adjusts at interval
Preparative layer constitutes one-dimensional grating by the silicon of periodic arrangement and GST, they are respectively placed in two between subelement and substrate, to adjust
Save the scattering phase difference between two subelements.Spacing distance between two subelements is much smaller than wavelength, it is believed that it is scattered
Light is spatial coherence, and in any adjustable polarization state output of the overlapped acquisition in space.
Based on the random polarization dynamic regulation method of super clever surface-phase-change material, the light beam for being incident to device surface includes
By the laser being adjusted and femtosecond laser, femtosecond laser carries out dynamic regulation to super clever surface device to realize.It is modulated
Laser and femtosecond laser are irradiated on device surface after closing beam.Emergent light includes two parts: a part of direction of propagation is along device
Part surface normal is bias light；Deviate device surface normal, the elliptic polarization comprising gained random polarization in another part direction of propagation
Light, object penetrating light.The energy of femtosecond laser is adjusted by pulse selector to realize the tune to GST Refractive Index of Material in device
Control, and then realize the regulation to outgoing object penetrating polarization state.
The device of the random polarization dynamic regulation method based on super clever surface-phase-change material of realization, comprising: laser rises
Inclined device, the first reflecting mirror, femto-second laser, attenuator, pulse selector, the first 4f telescopic system lens, the 2nd 4f look in the distance and are
System lens, beam cementing prism, device surface, bias light, the second reflecting mirror, analyzer and power meter.
Connection relationship: laser emitting obtains linearly polarized light by the polarizer by modulation laser, reflects through the first reflecting mirror
To beam cementing prism；It is saturating through attenuator and pulse selector and the first 4f telescopic system that femto-second laser is emitted femtosecond pulse
Beam cementing prism is incident to after mirror and the 2nd 4f telescopic system lens；It is incident to after modulation laser and femtosecond pulse economic cooperation beam
Device surface can get two beam emergent lights, and bias light is propagated along sample surfaces normal, the object penetrating light of polarization state needed for carrying
Device surface normal is deviateed in the direction of propagation, reaches power meter after the second reflecting mirror and analyzer.
The above-mentioned random polarization dynamic regulation device design based on super clever surface-phase-change material is completed to need to separately design V
Type nanotube antenna array and interval modulation layer, each section design method difference are as follows:
(1) V-type nanotube antenna array
The resonance of V-type nano-antenna and light field can form two kinds of eigen modes: symmetric pattern and antisymmetric mode.If entering
Ray polarization light polarization direction is parallel to its symmetry axis, only excites its symmetric pattern at this time；If incident light polarization direction perpendicular to
Its symmetry axis then only has antisymmetric mode at this time and is excited.Under normal circumstances, if any direction linearly polarized light vertical incidence is to sample
Product surface, then have:
Wherein α and β is the angle of incident ray polarized light polarization direction, antenna symmetry axis and y-axis respectively,WithIt respectively represents
In parallel with the unit vector of vertical antenna symmetry axis, SiAnd AiRespectively indicate i-th of antenna symmetry mode and antisymmetry in subelement
The scattering complex amplitude of mode.The scattered field of the antenna can further be write as:
Wherein x and y is respectively the unit vector along x-axis and y-axis.
As can be seen that scattered wave can be broken down into symmetric pattern and be superimposed with the complex amplitude of antisymmetric mode from formula (2),
That is (Si+Ai) and (Si-Ai) component.Their polarization direction and y-axis angle is respectively α and 2 β-α.By accurately selecting a day knot
Structure parameter, may be implemented | Si-Ai| substantially constant, and (Si+1-Ai+1) and (Si-Ai) phase difference be 2 π/N, N be one
The number of antenna in subelement；And | Si+Ai| amplitude etc., and (Si+1+Ai+1) and (Si+Ai) phase is substantially constant.In this way
The scattered wave of 2 β-α polarized components in the case of normal incidence can be allowed along abnormal refraction angle θt=arcsin (λ/D) is propagated,
λ is incident wavelength in formula, and D is the length in the direction subelement x；And along the scattering optical propagation direction of α polarization perpendicular to sample surfaces.
Meanwhile two subelements in each periodic unit possess identical structural parameters, but exist in the direction x
Offset d, as shown in Fig. 1.Therefore, two subelements can produce along θtThe anomalous scattering that the direction (λ/D)=arcsin is propagated
Light, and due to subelement in the y-direction it is spaced far be much smaller than wavelength, it can thus be assumed that its scatter light spatial coherence.In addition, two
Subelement antenna towards angle beta1And β2Meet β2-β1=45 °, i.e. (2 β2-α)-(2β1- α)=90 ° so that two scatter light polarizations
Direction is mutually perpendicular to.Also, offset d in the x-direction can control first between the two beam anomalous scattering light generated by subelement
Beginning phase difference, the phase difference meetAlthough there is aerial array spatial arrangement in two subelements
Difference, but its structural parameters is identical, therefore the scattering light amplitude obtained by two subelements is identical, space overlap it
It can be obtained the oval thickness of determining polarization state afterwards.
(2) interval modulation layer
In order to realize that super clever surface is adjustable to the dynamic of polarization state, need to introduce adjustable phasing scheme, accordingly, it is considered to draw
Enter using phase-change material as interval modulation layer.Interval modulation layer includes the bar shaped silicon and bar shaped GST of One Dimension Periodic arrangement, and point
Not between subelement 1, subelement 2 and substrate.The thickness of interval modulation layer can flexibly be chosen, but need in certain value
In range, enough phase-modulations are introduced to guarantee subelement when GST refractive index changes and guarantee scattering efficiency.
Beneficial effect
1, heretofore described technical solution utilizes the super clever surface based on metal V-type nanotube antenna array, in conjunction with the period
The Ge-Sb-Te GST modulating layer of arrangement, provide it is a kind of middle infrared band work high speed, flexibly to transmission polarization state carry out
The method arbitrarily regulated and controled can generate the ellipse inclined transmission of random polarization state under linear polarization normal incidence in any direction
Light, gained polarization state can realize that dynamic is adjustable, can solve current super clever surface polarizer and be difficult to realize dynamic polarization regulation
Problem.Particularly, the separation of gained target polarization light and background beam can be achieved in the present invention, avoids cross-talk.
2, the present invention is incorporated in business and repeats in erasable data storage extensively using the phase modulating properties on super clever surface
The phase-change material Ge-Sb-Te GST used, carries out adjustable polarization conversion.Cost is relatively low for the phase-change material, pumps in femtosecond laser,
Heat baking etc. under extrinsic motivateds can flexible conversion crystalline state and amorphous state, and can repeatedly use, it is steady to be remarkably improved device
It is qualitative, extend its dynamic application range.
3, the present invention is a kind of all solid state, ultra-thin, planar device, does not need any mechanical stretching, the operation such as rotation.This hair
It is bright to be widely portable to miniaturization, micromation, among integra-tion application, especially laser communication system, Polarization Detection system it
In, system complexity is significantly reduced, its volume and weight are effectively mitigated.And one kind can be provided for the on piece application of integrated optics
Flexible control measures.
Detailed description of the invention
Fig. 1 generates the device architecture schematic diagram of any adjustable polarization state based on super clever surface-phase-change material composite construction；Its
Middle antenna structure view (a), super clever surface-phase-change material composite construction schematic diagram (b).
Fig. 2 is generated and the light path schematic diagram of the adjustable oval thickness of detection dynamic；
The polarization analysis of the resulting abnormal transmitted light of GST different refractivity is taken under Fig. 3 extrinsic motivated；Wherein gained circular polarization
Degree is polarized and is reflected with GST with the corresponding gained polarization ellipse (b) of relationship (a), difference GST refractive index of GST variations in refractive index, gained
The relationship of rate variation.
Wherein, 1- laser；The 2- polarizer；The first reflecting mirror of 3-；4- femto-second laser；5- attenuator；6- pulse choice
Device；The first 4f telescopic system lens of 7-；The 2nd 4f telescopic system lens of 8-；9- beam cementing prism；10- device surface；11- background
Light；The second reflecting mirror of 12-；13- analyzer；14- power meter.
Specific embodiment
The present invention will be described in detail with reference to the accompanying drawings and examples.Specific implementation described herein is only to solve
The present invention is released, is not intended to limit the present invention.
Below by taking operation wavelength is the super clever surface of λ=4 μm as an example, propose a kind of based on super clever surface-phase-change material
Random polarization dynamic regulation device and method.Wherein, a kind of random polarization state dynamic regulation based on super clever surface-phase-change material
Device is made of V-type nano-antenna layer, interval modulation layer and substrate, as shown in Figure 1.The design process of the device includes two
Key step:
(1) super clever surface V-type nanotube antenna array design
Son comprising two different arrangement modes in the signal period on the super clever surface based on V-type nanotube antenna array is single
Member, mainly to generate surface phase gradient, thus generate deviate sample normal, along anomalous refraction direction propagate two beams it is orthogonal
Polarised light, and there is fixed phase difference.The scattered field of individual antenna can be expressed as the form in formula (2), such as Fig. 1 (a) institute
Show.Its scattered wave can be broken down into symmetric pattern and be superimposed with the complex amplitude of antisymmetric mode, i.e. (Si+Ai) and (Si-Ai) point
Amount, their polarization direction and y-axis angle is respectively α and 2 β-α.The selection of V-type nano-antenna parameter can be taken as follows
Method: by V-type nano-antenna symmetry axis and y-axis angle in 45 ° of placements, the width and thickness of fixed V-type nano-antenna, using tight
Grid vector simulation software scans the brachium and angle of V-type nano-antenna, when the light wave normal incidence polarized in the x-direction to super clever surface
When, 2 direction β-α polarized components polarize along the y-axis direction just, and the difficulty that emulation data are extracted can be effectively reduced in this way.Root
It, can according to resulting 2 β-α component scattered amplitude of V-type nano-antenna, the relationship of phase and V-type nano-antenna brachium and angle is scanned
Carefully to choose suitable V-type nano-antenna parameter, guarantee | Si-Ai| substantially constant, and (Si+1-Ai+1) and (Si-Ai) phase
The difference of position is 2 π/N, and N is the number of antenna in a subelement；And | Si+Ai| amplitude etc., and (Si+1+Ai+1) and (Si+
Ai) phase is substantially constant.By designing the parameter and arrangement mode of V-type nanotube antenna array, so that 2 in the case of normal incidence
The scattered wave of β-α polarized component can be along anomalous refraction direction θt=arcsin (λ/D) is propagated, and the scattering light along α polarization passes
Direction is broadcast perpendicular to sample surfaces.In the present embodiment, N=8, incident light polarization angle α=45 °, the direction subelement x length are chosen
D=7.5 μm, square-lattice side length where each antenna is 937.5nm, not for 4 groups of V-type nano-antenna selection in subelement
Same parameter, the brachium L of first four antenna are respectively 457nm, 418nm, 302nm and 244nm, and antenna aperture angle θ is respectively
60 °, 90 °, 120 ° and 180 °, (S can be made in this wayi-Ai) component phase distribution successively phase difference of pi/8, remaining four groups of V-type nanometer
Antenna, which only needs for the symmetry axis of above-mentioned antenna to be rotated by 90 ° along y-axis, can make reverse-phase, so that the aerial array can
Constant surface phase gradient is generated, and amplitude preservation is constant, as shown in Fig. 1 (b), anomalous refraction angle θ at this timet=arcsin
(λ/D)≈32°.It is worth noting that, the angular aperture of antenna 4 and 8 is 180 ° at this time, structure has been degenerated for single-arm antenna.Phase
Than in V-type nano-antenna, single-arm antenna scattered amplitude is more sensitive to surrounding dielectric environment, when GST refractive index increases, dissipate
Larger oscillation can be undergone by penetrating amplitude, but the amplitude variations of this respective antenna can't significantly change dissipating for entire super clever surface
Penetrate efficiency.
Since two subelements in signal period possess identical structural parameters, two subelements
Generate the anomalous scattering light along equidirectional propagation, but two sub- element antennas towards angle beta1And β2β need to be met2-β1=45 °, i.e.,
(2β2-α)-(2β1- α)=90 ° so that two anomalous scattering light polarization directions are mutually perpendicular to, β is taken as in the present embodiment respectively1=
67.5 ° and β2=112.5 °.The orthogonality is unrelated with incident light polarization direction α, be only dependent upon two subelement antennas towards angle beta1
And β2Difference.In addition, offset d in the x-direction can control the phase difference between two scattering light, which meetsHere d can arbitrarily choose, this only determines that, when substrate is uniform, entire device is defeated
Polarization state out plays phase zeroing.In this implementation offset d be taken as D/4=1.875 μm so that when GST refractive index with
When Si base refractive index is identical, it is emitted as circularly polarized light.
(2) interval modulation layer
Interval modulation layer is mainly to the scattering phase difference between two subelements of dynamic regulation.GST is at 2.8 μm to 5.5 μ
There are a transmission window between m, the absorption of material can be ignored in this range of wavelengths.GST turns from amorphous state at this time
When becoming crystalline state, refractive index can be varied widely.And if be somebody's turn to do using suitable optics, electricity or thermal means
Process is reversible.The refraction index changing of GST material can significantly affect the local surface of the V-type antenna of the subelement on GST layers
Phasmon resonance, this will will lead to the translation of V-type antenna resonance peaks, and significantly change phase of the light in this assembly of thin films
Accumulation, and the V-type antenna influence for being located at subelement on silicon layer can almost be ignored.The wideband resonance of V-type nano-antenna is special
Property make its in GST variations in refractive index scattered amplitude variation it is smaller, and phase experience large change.It is emulated using stringent vector
Software, can be with the verifying of V-type nano-antenna-GST layers-substrate multilayered structure in GST layers of variations in refractive index, to V-type nano-antenna
The modulation of scattering nature.In emulation, V-type nano-antenna symmetry axis same as y-axis angle is in 45 ° of placements in order to emulate data
It extracts.
It is its thickness that interval modulation layer, which needs the parameter controlled, and the thickness of GST will affect antenna resonance peaks in identical refraction
The size of distance and the electromagnetic wave phase accumulation in assembly of thin films translated under rate situation of change.Therefore, GST thickness degree can be with
Determine phase-adjusted range, too small thickness is not enough to bring enough phase accumulations, causes phase adjustment range smaller, mistake
Big thickness will lead to resonance peak drift excessively, influence scattering efficiency.The selection of GST thickness needs to guarantee enough phase adjusteds
Range and scattering efficiency so that the antenna being located on subelement 2 can undergo lesser amplitude variations, and keep biggish phase
Delay variation；The antenna scattering property on subelement 1 is basically unchanged at the same time.GST variations in refractive index range also exists simultaneously
Limitation, if variations in refractive index is excessive, the resonance peak that will lead to V-type nano-antenna will thoroughly remove operating wavelength area, lead
Cause scattered amplitude greater loss.It is used as conceptual verifying simultaneously, variations in refractive index starting point can be set to n=3.Using stringent
The emulation of vector simulation software, for available GST thickness degree in 500nm between 800nm, refractive index is changed to n=4.5 from n=3
When, it can make the scattered amplitude for reaching the phase-modulation of π by the light field of V-type nano-antenna scattering, and being consistent.This reality
It applies in example, GST thickness degree is taken as 500nm.It therefore, can be by controlling the refractive index control of GST respectively from two subelements
Orhtogonal linear polarizaiton scatters the phase difference between light, and two bunch polarised lights can be obtained adjustable polarization state after space overlap
Control.
The device of random polarization dynamic regulation method is realized, as shown in Fig. 2, the outgoing of laser 1 is passed through by modulation laser
Inclined device 2 obtains linearly polarized light, reflexes to beam cementing prism 9 through the first reflecting mirror 3；Femto-second laser 4 is emitted femtosecond pulse warp
Beam cementing prism 9 is incident to after attenuator 5 and pulse selector 6 and 4f telescopic system lens 7,8；By modulation laser and femtosecond arteries and veins
Device surface 10 is incident to after impulse light economic cooperation beam can get two beam emergent lights, and bias light 11 is propagated along sample surfaces normal, taken
Object penetrating optical propagation direction with required polarization state deviates device surface normal, after the second reflecting mirror 12 and analyzer 13
Reach power meter 14.It is exported by the energy that impulse regulator adjusts femto-second laser to control GST variations in refractive index range.
The circular polarization of super clever surface oval thickness obtained when modulating GST refractive index from n=3 to n=4.5, energy
Amount distribution, the polarization analysis of the expression and gained polarization state of polarization ellipse, polarization state in poincare sphere is respectively such as Fig. 3 (a-d)
It is shown.Here circular polarization is defined as | ILCP-IRCP|/|ILCP+IRCP|, wherein ILCPAnd IRCPRespectively represent left circularly polarized light and
The light intensity of right-circularly polarized light.Polarization analysis can measure output power by rotation analyzer 13 and power meter 14 and obtain.In n=
The circular polarization state and linear polarization of high quality can be obtained when 3.4 and n=4.2 respectively, and intermediate all polarization states can be with
It is continuous to obtain, as shown in Fig. 3 (b), (d).
The present invention is based on the super clever surfaces of V-type nanotube antenna array, the phase-modulation that the GST by introducing period arrangement is constituted
Layer can realize arbitrary polarization state synthesis in the phase difference of extrinsic motivated modulated difference subelement outgoing orthogonal polarisation state.It should
Method is a kind of all solid state modulator approach, does not need the mechanics modulation means such as any stretching or rotation, and due to drawing
Enter surface phase gradient, there are certain angles for the abnormal transmission-polarizing light produced and former ordinary transmission light direction, to avoid friendship
Pitch crosstalk.This method provides a kind of flexible control measures for the on piece application of integrated optics, is expected to be widely used in optics
Component miniaturization is miniaturized, among integra-tion application.
Claims (4)
1. the random polarization dynamic regulation device based on super clever surface-phase-change material, it is characterised in that: by V-type nano-antenna layer,
Interval modulation layer and basal layer are constituted；The each periodic unit of V-type nano-antenna layer includes two parts subelement, and subelement is by having
There is the V-type nanotube antenna array of different arrangement modes to constitute, two parts subelement generates the mutually orthogonal line in polarization direction respectively
Polarization scattering light；The V-type nanotube antenna array has surface phase gradient, so that the direction of propagation of score polarization scattering light is inclined
From incident direction；Interval modulation layer constitutes one-dimensional grating by the silicon of periodic arrangement and Ge-Sb-Te, they are respectively placed in two sons
Between unit and substrate, to adjust the scattering phase difference between two subelements.
2. the random polarization dynamic regulation device as described in claim 1 based on super clever surface-phase-change material, feature exist
In: the design method of the V-type nanotube antenna array is as follows:
The resonance of V-type nano-antenna and light field can form two kinds of eigen modes: symmetric pattern and antisymmetric mode；If incident ray
Polarization light polarization direction is parallel to its symmetry axis, only excites its symmetric pattern at this time；If incident light polarization direction is right perpendicular to its
Claim axis, then only has antisymmetric mode at this time and be excited；Under normal circumstances, if any direction linearly polarized light vertical incidence is to sample table
Face then has:
Wherein α and β is the angle of incident ray polarized light polarization direction, antenna symmetry axis and y-axis respectively,WithIt respectively represents parallel
With the unit vector of vertical antenna symmetry axis, SiAnd AiRespectively indicate i-th of antenna symmetry mode and antisymmetric mode in subelement
Scattering complex amplitude；The scattered field of the antenna can further be write as:
Wherein x and y is respectively the unit vector along x-axis and y-axis；
As can be seen that scattered wave can be broken down into symmetric pattern and be superimposed with the complex amplitude of antisymmetric mode from formula (2), i.e. (Si
+Ai) and (Si-Ai) component；Their polarization direction and y-axis angle is respectively α and 2 β-α；By accurately antenna structure being selected to join
Number, may be implemented | Si-Ai| it is constant, and (Si+1-Ai+1) and (Si-Ai) difference of phase is 2 π/N, N is in subelement
The number of antenna；And | Si+Ai| amplitude etc., and (Si+1+Ai+1) and (Si+Ai) phase be constant；It can make just entering in this way
The scattered wave of 2 β-α polarized components can be along abnormal refraction angle θ in the case of penetratingt=arcsin (λ/D) is propagated, and λ is incidence wave in formula
Long, D is the length in the direction subelement x；And along the scattering optical propagation direction of α polarization perpendicular to sample surfaces；
Meanwhile two subelements in each periodic unit possess identical structural parameters, but exist in the direction x and deviate
d；Therefore, two subelements can produce along θtThe anomalous scattering light that the direction (λ/D)=arcsin is propagated, and due to subelement
In the y-direction it is spaced far be much smaller than wavelength, it can thus be assumed that its scatter light spatial coherence；In addition, the direction of two subelement antennas
Angle beta1And β2Meet β2-β1=45 °, i.e. (2 β2-α)-(2β1- α)=90 ° so that two scatter light polarization directions are mutually perpendicular to；And
And offset d in the x-direction can control the initial phase difference between the two beam anomalous scattering light generated by subelement, the phase
Difference meets Although aerial array spatial arrangement is had any different in two subelements, its structure
Parameter is identical, therefore identical from two subelements gained scattering light amplitude, can be obtained determination after space overlap
The oval thickness of polarization state.
3. the regulation method of the random polarization dynamic regulation device as described in claim 1 based on super clever surface-phase-change material,
It is characterized by: being irradiated on device surface after closing beam by modulation laser and femtosecond laser；The energy of femtosecond laser passes through
Pulse selector is adjusted to realize the regulation to Ge-Sb-Te Refractive Index of Material in device, and then is realized inclined to outgoing object penetrating light
The regulation of polarization state.
4. realize the device of the random polarization dynamic regulation method as claimed in claim 3 based on super clever surface-phase-change material,
It is characterized by comprising laser (1), the polarizer (2), the first reflecting mirror (3), femto-second laser (4), attenuators (5), pulse
Selector (6), the first 4f telescopic system lens (7), the 2nd 4f telescopic system lens (8) beam cementing prism (9), device surface
(10), bias light (11), the second reflecting mirror (12), analyzer (13) and power meter (14)；
Connection relationship: laser (1) outgoing obtains linearly polarized light by the polarizer (2) by modulation laser, through the first reflecting mirror (3)
Reflex to beam cementing prism (9)；Femto-second laser (4) be emitted femtosecond pulse through attenuator (5) and pulse selector (6) and
Beam cementing prism (9) are incident to after first 4f telescopic system lens (7) and the 2nd 4f telescopic system lens (8)；By modulation laser with
Device surface (10) are incident to after femtosecond pulse economic cooperation beam can get two beam emergent lights, and bias light (11) is along sample surfaces method
Line is propagated, and the object penetrating optical propagation direction of polarization state needed for carrying deviates device surface normal, by the second reflecting mirror (12)
Power meter (14) is reached afterwards with analyzer (13).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710072725.5A CN106681026B (en) | 2017-02-10 | 2017-02-10 | Random polarization dynamic regulation device and method based on super clever surface-phase-change material |
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| CN201710072725.5A CN106681026B (en) | 2017-02-10 | 2017-02-10 | Random polarization dynamic regulation device and method based on super clever surface-phase-change material |
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