CN208421454U - A kind of optical polarizator - Google Patents
A kind of optical polarizator Download PDFInfo
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- CN208421454U CN208421454U CN201821305671.9U CN201821305671U CN208421454U CN 208421454 U CN208421454 U CN 208421454U CN 201821305671 U CN201821305671 U CN 201821305671U CN 208421454 U CN208421454 U CN 208421454U
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- optical polarizator
- nugget
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Abstract
The utility model belongs to field of optical device technology, more particularly to a kind of optical polarizator, including a structural body, structural body is formed by connecting by the identical periodic unit of multiple structures by rectangular Periodic array, it include a L shape structure in each periodic unit, L shape structure includes a nugget and a regulation block, and regulation block is vertical with nugget to connect and compose L shape structure, regulates and controls block by VO2Material is made.The purpose to the dynamic regulation of asymmetric transmission signal is realized to change the embodiment of the present application optical polarizator asymmetric transmission signal by adjusting the transmissison characteristic that optical polarizator local environment temperature is changeable regulation block.Preparation and application is simple and convenient, easily operated.Solve fixed structure asymmetric transmission signal existing in the prior art to fix, can not dynamic regulation the problem of, it is simple to operate, provide a kind of new thinking for the design of optical polarizator.
Description
Technical field
The invention belongs to field of optical device technology, and in particular to a kind of optical polarizator.
Background technique
Asymmetric transmission (Asymmetric Transmission, AT) refers to that Transmission system enters to along different transmission directions
The electromagnetic wave penetrated shows different conversion performances.As shown in Fig. 1 (a), a polarization conversion asymmetric transmission system A is come
It says, the left-handed rotation (left circularly polarized, LCP) incident from the front system A receives after system A
The transmissivity of right-handed rotation (right circularly polarized, RCP) isFrom the left-handed rotation of system A back surface incident
The transmissivity of the right-handed rotation received after system A isWherein arrow direction indicates front or back from Transmission system
Face is incident, and subscript "-" indicates that incident light is left-handed rotation, and "+" indicates that emergent light is right-handed rotation.The total transmittance of one polarization state light
Are as follows:
Then the asymmetric transmission of system A polarization conversion can be indicated are as follows:
Change further through Lorentz:
It obtains:
Above-mentioned expression formula shows along the side circularly polarized light incidence-z
Value to the asymmetric transmission of excitation is opposite with the value of asymmetric transmission excited in the direction+z.For clear and specific table
It states, we provide that circularly polarized light is incident along the direction-z in the present invention.
Shown in its physical significance such as Fig. 1 (b) indicated, it is incident on the left-handed rotation of system A from front, turns after system A
The right-handed rotation being changed to, with the right-handed rotation for being incident on system A from front, the left-handed conversion ratio be converted to after system A is not
With.The value of asymmetric transmission is identical when for from back surface incident.
What the system that tradition realizes asymmetric transmission usually utilized is made of reciprocity material or device, and electromagnetic wave equally has
There are reciprocity, the i.e. invertibity in electromagnetic wave propagation path.For asymmetric transmission comprising many contents such as transmit
Intensity, optical activity and polarization conversion etc..And most of the asymmetric transmission optical system of polarization conversion may be implemented all is more
Layer structure, is realized using coupling between layers mostly and the electromagnetic wave of different polarization is converted.For this
For each layer of a little bilayer or multilayer structures, they do not have chirality, but due to there is rotation angle between layers, so that whole
A structure has chirality.Generally all have a good asymmetric transmission characteristic for the chiral structure of this multilayer, but by
In its structure is complicated, generally all it is difficult to prepare in an experiment, actual production manufacture difficulty is bigger.
Single layer chiral structure also has the asymmetric transmission characteristic of polarization conversion, and preparation method is relative to double-deck and more
Layer structure is all easier.For planar chiral structure, center of gravity has been placed on explanation and has caused to turn not same polarization by most of
When changing rate, the different distributions of charge or electric current, and careful grind is not carried out for the regulation of different polarization transformation modes
Study carefully.A certain specific mode can only be realized or be generated to a kind of specific structure, usually change its asymmetric transmission signal just
The geometric parameter for needing to change the structure redesigns and makes new structure, and fabrication cycle is long, and labour cost is high.
Summary of the invention
Fix to solve fixed structure asymmetric transmission signal existing in the prior art, can not dynamic regulation ask
Topic, the embodiment of the present application provide a kind of optical polarizator, and the embodiment of the present application is by adjusting optical polarizator local environment temperature
The transmissison characteristic of the i.e. changeable regulation block of degree is realized to change the embodiment of the present application optical polarizator asymmetric transmission signal
To the purpose of the dynamic regulation of asymmetric transmission signal.Preparation and application is simple and convenient, easily operated.
The technical problem to be solved in the present invention is achieved through the following technical solutions:
A kind of optical polarizator, including a structural body；The structural body is pressed by the identical periodic unit of multiple structures
Rectangular Periodic array is formed by connecting；It include a L shape structure in each periodic unit；The L shape structure includes
One nugget and a regulation block；The regulation block is vertical with the nugget to connect and compose the L shape structure；The tune
Block is controlled by VO2Material is made.
Further, the optical polarizator further includes basal layer；The structural body is connected on basal layer；The base
Bottom is made of transparent insulation material.
Further, the nugget is rectangle, trapezoidal or triangle；The regulation block be rectangle, it is trapezoidal or
Triangle.
Further, the nugget and the regulation block thickness are equal or unequal.
Further, the nugget is L shape structure, and the regulation block is rectangular block；The regulation block is embedded in institute
It states nugget or is connected to described nugget one end.
Further, the adjusting method of the asymmetric transmission signal of a kind of optical polarizator, comprising the following steps:
The optical polarizator is placed in the adjustable closed environment of a temperature, by adjust 68 DEG C of environment temperature T < or
68 DEG C of person T >, the regulation block VO2There is different phases in 68 DEG C of T < or 68 DEG C of T >, generate different transmissison characteristics,
To obtain different asymmetric transmission characteristics；It can reach adjusting institute by adjusting the optical polarizator local environment temperature i.e.
State the purpose of optical polarizator asymmetric transmission signal.
Compared with prior art, beneficial effects of the present invention:
1. the embodiment of the present application optical polarizator is L shape planar structure, planar chiral can produce, to different rotatory polarizations
Different polarization conversion rates is generated, single layer structure is simple relative to double-deck and multilayer chiral structure structure, is more easier to prepare, phase
Than being more widely applied in double-deck and multilayered structure.
2. the embodiment of the present application optical polarizator, which regulates and controls block, uses VO2Material is made, by changing locating for optical polarizator
Environment temperature T, VO2There is different phases at different temperatures, (68 DEG C of T >) VO when high temperature2Lattice structure be cubic golden red
Stone structure, in low temperature, (68 DEG C of T <) is monocline, and by environment temperature described in adjusting optical polarizator, tune can be realized
Control block VO2The phase of material converts, VO2Different transmissison characteristics is shown in different phase, so generate different asymmetric biographies
Defeated signal.The embodiment of the present application optical polarizator structural body is single layer structure, easily prepared, and can produce biggish AT letter
Number, conducive to the detection of signal, adjusting method is simple, haves no need to change structure itself, need to only adjust locating for the optical polarizator
The change to optical polarizator regulation block of material property can be realized in the temperature of environment, to change the optical polarizator
The optical transmission property of structural body, thus realize the change to the embodiment of the present application optical polarizator asymmetric transmission signal,
Solve the problems, such as that current fixed structure asymmetric transmission signal can not change, it is simple to operate, not only to Future Design light
Learning polarizer has certain design guidance effect, the research of more other optical devices provide the new research direction of one kind with
Thinking.
3. the embodiment of the present application optical polarizator structure is simple, asymmetric transmission Signal Regulation is convenient and efficient, does not need to change
Structure changes itself, it is only necessary to adjust environment temperature according to actual needs, can be realized the embodiment of the present application optical polarizator for
The adjusting of different circularly polarized light transmissison characteristics, structure is simple, and preparation process and adjusting method are simple and convenient, easily operated.
4. the embodiment of the present application optical polarizator, which regulates and controls block, uses phase-change material VO2It is made, VO2Phase transition temperature be about
68 DEG C, it is not much different with room temperature, will not influence the geometry and optical characteristics of other building blocks of the optical polarizator, performance is steady
It is fixed, it is unlikely to deform damage, long service life.
5. VO in the embodiment of the present application optical polarizator2After reaching phase transition temperature, transformation time is very short, at ns grades
Not, the regulation sensitivity of the embodiment of the present application optical polarizator asymmetric transmission signal can greatly be improved.
6. VO in the embodiment of the present application optical polarizator2Phase transition process be reversible, and can be repeated several times, can answer extensively
Used in temperature control device, optoelectronic switch etc. uses, saving resource low with preparation cost.
Detailed description of the invention
Fig. 1 is the asymmetric transmission schematic illustration of the embodiment of the present application polarization conversion；
Fig. 2 is the embodiment of the present application optical polarizator schematic perspective view；
Fig. 3 is 1 L shape structure structural schematic diagram a of the embodiment of the present application；
Fig. 4 is 1 L shape structure structural schematic diagram b of the embodiment of the present application；
Fig. 5 is 1 L shape structure structural schematic diagram c of the embodiment of the present application；
Fig. 6 is 1 L shape structure structural schematic diagram d of the embodiment of the present application；
Fig. 7 is asymmetric transmission conversion spectrogram of the embodiment of the present application optical polarizator under different temperatures environment；
Fig. 8 is the current distributing figure of the embodiment of the present application optical polarizator L shape structure at normal temperature；
Fig. 9 is the current distributing figure of the embodiment of the present application optical polarizator L shape structure at high temperature.
Wherein: 1, nugget；2, regulate and control block.
Specific embodiment
The embodiment of the present application provides a kind of optical polarizator, and the embodiment of the present application is by adjusting ring locating for optical polarizator
Border temperature is the transmissison characteristic of changeable regulation block, thus change the embodiment of the present application optical polarizator asymmetric transmission signal,
Solve fixed structure asymmetric transmission signal existing in the prior art to fix, can not dynamic regulation the problem of, realize to non-
The purpose that symmetrical transmission signal dynamics are adjusted.Preparation and application is simple and convenient, easily operated.
Further detailed description is done to the present invention combined with specific embodiments below, but embodiments of the present invention are not limited to
This.
Embodiment 1:
As shown in Fig. 2, a kind of optical polarizator, including a structural body, the structural body are identical by multiple structures
Periodic unit is formed by connecting by rectangular Periodic array, includes a L shape structure in each periodic unit, described " L "
Shape structure includes a nugget 1 and a regulation block 2, and described 2 one end of regulation block is vertical with described 1 one end of nugget to connect structure
At the L shape structure.
Specifically:
The regulation block 2 is by VO2Material is made.The optical polarizator further includes basal layer, the structural body connection
In on basal layer, the basal layer is made of transparent insulation material, and the present embodiment basal layer is preferably that glass material is made.
As shown in Fig. 3~Fig. 6, the nugget 1 be rectangle, trapezoidal or triangle, the regulation block 2 be rectangle,
Trapezoidal or triangle.The nugget 1 and 2 thickness of the regulation block are equal or unequal.The vertically connection of regulation block 2
In the nugget 1.
Specifically: as shown in Figure 3 and Figure 4, the nugget 1 is rectangle, and the regulation block 2 is rectangle or triangle
Shape, the nugget 1 is equal with regulation 2 thickness of block, 2 height equal, " L " of the nugget 1 and the regulation block
The field distribution of shape structure is in same plane, when regulating and controlling block 2 is triangle, is changed nugget 1 and is regulated and controled the electricity of block 2
Lotus distribution achievees the purpose that change electric-field enhancing position.
As shown in figure 5, the nugget 1 and regulation block 2 are rectangle, the nugget 1 and the regulation block 2 are thick
Spend equal, the nugget 1 and the height of the regulation block 2 are unequal, so that the surface of the nugget 1 and regulation block 2
Field distribution and electric-field enhancing position change, and change charge circulation patterns, so that the electric field of the L shape structure is three-dimensional
Change.
As shown in fig. 6, the nugget 1 and regulation block 2 are rectangle, the nugget 1 and the regulation block 2 are thick
Spend equal, the nugget 1 and the height of the regulation block 2 are equal, and the nugget 1 and the regulation block 2 are staggeredly located；
The nugget 1 and 2 contact position of regulation block and area difference, so that the field distribution on 1 surface of the nugget
It changes with electric-field enhancing position, changes circulation patterns, so that the electric field three dimensional stress of the L shape structure.
The present embodiment is the transmissison characteristic that regulation block 2 can be changed by adjusting optical polarizator local environment temperature, thus
Change the embodiment of the present application optical polarizator for the asymmetric transmission signal of circularly polarized light, solves existing in the prior art
Fixed structure asymmetric transmission signal is fixed, can not dynamic regulation the problem of, realize to the dynamic regulation of asymmetric transmission signal
Purpose.Preparation and application is simple and convenient, easily operated.
The present embodiment optical polarizator is L shape planar structure, can produce planar chiral, is generated not to different rotatory polarizations
Same polarization conversion rate, single layer structure is simpler relative to double-deck and multilayer chiral structure structure, preparation is easy, compared to double
Layer and multilayered structure application are also more extensive.
The present embodiment regulation block 2 is using VO2Material is made.
Specifically:
The present embodiment optical polarizator regulates and controls block 2 and uses VO2Material is made, by changing optical polarizator local environment temperature
Spend T, VO2There is different phases at different temperatures, (68 DEG C of T >) VO when high temperature2Lattice structure be cubic rutile knot
Structure, in low temperature, (68 DEG C of T <) is monocline, and by adjusting optical polarizator local environment temperature, regulation block can be realized
2VO2The purpose of the phase conversion of material, VO2Different transmissison characteristics is shown in different phase, so generate different non-
Symmetrical transmission signal.The embodiment of the present application optical polarizator structural body is single layer structure, easily prepared, and be can produce larger
AT signal, be conducive to the detection and detection of signal, adjusting method is simple, haves no need to change structure itself, need to only adjust described
The change to optical polarizator regulation 2 material properties of block can be realized in the temperature of optical polarizator local environment, to change
Become the optical transmission property of the optical polarizator structural body, to realize asymmetric to the embodiment of the present application optical polarizator
The adjusting for transmitting signal, solves the problems, such as that current fixed structure asymmetric transmission signal can not change, simple to operate, not only
There is certain design guidance effect to Future Design optical polarizator, the research of more other optical devices provides a kind of new
Research direction and thinking.
The present embodiment optical polarizator regulates and controls block 2 and uses phase-change material VO2It is made, VO2Phase transition temperature be about 68 DEG C,
It is not much different with room temperature, will not influence the geometry and optical characteristics of other building blocks of the optical polarizator, performance is stablized, no
Easily-deformable damage, long service life.
VO in the present embodiment optical polarizator2After reaching phase transition temperature, transformation time is very short, can be in ns rank
Greatly improve the regulation sensitivity of the embodiment of the present application optical polarizator asymmetric transmission signal.The present embodiment optical polarizator
Middle VO2Phase transition process be reversible, and can be repeated several times, can be widely used in temperature control device, optoelectronic switch etc., use
It is low with preparation cost, it saves resource and avoids the wasting of resources.
The present embodiment optical polarizator structure is simple, and asymmetric transmission Signal Regulation is convenient and efficient, haves no need to change structure
Itself, it is only necessary to environment temperature is adjusted according to actual needs, can be realized saturating for different circularly polarized lights to the embodiment of the present application
The adjusting of characteristic is penetrated, to change the purpose of its asymmetric transmission characteristic, structure is simple, and preparation process and adjusting method are simply square
Just, easily operated.
Particularly, L shape planform can be with are as follows: the nugget 1 is L shape structure, and the regulation block 2 is square
Shape block, the regulation block 2 is embedded in the nugget 1 or is connected to described 1 one end of nugget.Same realize passes through environment
Temperature adjusts the purpose of the optical polarizator asymmetric transmission signal.
Embodiment 2:
For a kind of regulating effect of the asymmetric transmission signal of optical polarizator disclosed in embodiment 1 is further described,
Present embodiment discloses the polarization of the optical polarizator as shown in Figure 7 to convert spectrogram.Based on optics disclosed in embodiment 1
Polarizer L shape structure is imitated by using dimensional finite element method (FEM) software for calculation COMSOL Multiphysics
True simulation calculates, and it is as follows according to 1 L shape configuration settings of embodiment parameter to be specifically arranged with pattern generator:
The nugget 1 and regulation block 2 are rectangle, and each periodic unit period is Px=Py=700nm；L shape
The size of structure are as follows: long l1=400nm, wide w1=200nm, high h1=360nm；Regulate and control the long l of block 22=350nm, wide w2=
150nm, high h2=360nm.
Experiment simulation measures polarization of the present embodiment optical polarizator in high temperature (68 DEG C of T >) and low temperature (68 DEG C of T <)
Spectrogram is converted, as shown in fig. 7, the present embodiment is preferably T=20 when the present embodiment optical polarizator is placed in normal temperature environment
DEG C, three asymmetric transmission modes are produced, λ=850nm, AT=-11.6% are respectively as follows:, symbol is negative；λ=1000nm,
AT=1.9%, symbol are positive；λ=1200nm, AT=-6.1%, symbol are negative；When hot environment, the present embodiment is excellent
It is selected as T=68 DEG C, generates asymmetric transmission mode: λ=900nm, AT=-12.1%.
Compared with normal temperature environment, the present embodiment optical polarizator asymmetric transmission mode is increased hot environment by one
Three, and the symbol of asymmetric transmission signal is also changed.Three lesser AT signals are generated under room temperature, are produced at high temperature
A raw biggish AT signal, under the embodiment of the present application normal temperature environment in, the symbol of asymmetric transmission signal is become just from negative,
Become negative again, in the change dramatically of the band signal symbol, peak type is sharp, and noise is small, especially non-for highly sensitive detection
Chang Youyi, the relative size of the adjustable polarised light polarization conversion of the embodiment of the present application optical polarizator, passes through environment temperature
The adjusting and symbol conversion of asymmetric transmission mode are realized in variation.
It is illustrated in figure 8 the current distributing figure of optical polarizator disclosed in embodiment 1, Fig. 8 (a) (b) (c) is respectively to be
At T=20 DEG C of environment temperature, in LCP incidence, resonant wavelength is 850nm, current distributing figure when 1000nm, 1200nm, figure
8 (d) (e) (f) are respectively to be at T=20 DEG C, and in RCP incidence, resonant wavelength is 850nm, electricity when 1000nm, 1200nm
Flow point Butut.
It is illustrated in figure 9 when optical polarizator local environment temperature rises to 68 DEG C, the present embodiment optical polarizator is non-right
Transmission polarization is claimed to convert spectrogram, if Fig. 9 (a) is current distributing figure when resonant wavelength is 900nm when LCP incident light irradiates；
If Fig. 9 (b) is current distributing figure when resonant wavelength is 900nm when RCP incident light irradiates.Wherein T+- is LCP incident, is received
RCP signal, T-+ are RCP incident, receive LCP signal.
It can see from Fig. 8 and Fig. 9, either room temperature or high temperature, can all form annular electro in the vertical direction
Stream, to generate strong AT signal.
Embodiment 3:
Based on a kind of optical polarizator disclosed in embodiment 1, present embodiment discloses a kind of the asymmetric of optical polarizator
Transmit the adjusting method of signal, comprising the following steps:
The optical polarizator is placed in the adjustable closed environment of a temperature, by adjust 68 DEG C of environment temperature T < or
68 DEG C of person T >, the regulation block 2VO2There is different phases in 68 DEG C of T < or 68 DEG C of T >, it is special to generate different transmissions
Property, to obtain different asymmetric transmission signals.It can reach tune by adjusting the optical polarizator local environment temperature
Save the purpose of the optical polarizator asymmetric transmission signal.
Specifically:
The present embodiment optical polarizator is prepared using magnetron sputtering method.Specifically, in the present embodiment, first in room temperature
Under, the optical polarizator is placed in optical spectrometer sample chamber, cooling chamber's temperature is room temperature, i.e., 20 DEG C, VO at this time2For monocline
Structure opens optical light source and detector, measures the AT curve of optical polarizator under room temperature as shown in Figure 7.
Then heating chamber temperature is to 68 DEG C, VO2It undergoes phase transition, for cubic rutile structure, opens optical light source and detector,
Measure the AT curve of optical polarizator under high temperature as shown in Figure 7.
By the adjusting of chamber temp, the polarizer structure after phase transformation is reduced to initially by cooling chamber's temperature to room temperature
State, the circularly polarized light conversion characteristic of the embodiment of the present application structural body be also restored to before state, can be realized for institute
State the adjusting of optical polarizator asymmetric transmission signal.
The preparation process of optical polarizator structure requires very harsh, and a kind of structure can only realize its specific AT mode,
The conversion and adjustment to realize different mode can not be made the appropriate adjustments on the basis of the structure, and can only be by resetting institute
Structural parameters are needed, prepare the structure again to achieve the purpose that us.Optical polarizator as described in example 1 above, Ke Yitong
Structure local environment temperature is crossed, changes the transmissison characteristic of the structure regulating block 2 in the case where not preparing again, reaches change circle
Polarized light transmission characteristic adjusts the purpose of the embodiment of the present application optical polarizator asymmetric transmission signal.In the present embodiment, in ring
After border temperature changes, it is as shown in Figure 7 that its asymmetric transmission signal is tested in 100~2200nm wave band.
So the present embodiment optical polarizator can pass through change by realizing to the adjusting of regulation 2 material properties of block
Phase-change material VO2Locating environment temperature is realized non-to the optical polarizator to realize to the adjusting of regulation 2 transmissison characteristic of block
The adjusting of symmetrical transmission signal, it is simple to operate, a kind of new thinking is provided for the design of optical polarizator.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (5)
1. a kind of optical polarizator, it is characterised in that: including a structural body；The structural body is by multiple structures identical week
Phase unit is formed by connecting by rectangular Periodic array；It include a L shape structure in each periodic unit；
The L shape structure includes a nugget and a regulation block；The regulation block is vertical with the nugget to connect structure
At the L shape structure；
The regulation block is by VO2Material is made.
2. a kind of optical polarizator according to claim 1, it is characterised in that: the optical polarizator further includes substrate
Layer；The structural body is connected on basal layer；The basal layer is made of transparent insulation material.
3. a kind of optical polarizator according to claim 1, it is characterised in that: the nugget be rectangle, it is trapezoidal or
Person's triangle；The regulation block is rectangle, trapezoidal or triangle.
4. a kind of optical polarizator according to claim 1, it is characterised in that: the nugget and the regulation block are thick
It spends equal or unequal.
5. a kind of optical polarizator according to claim 1, it is characterised in that: the nugget is L shape structure, institute
Stating regulation block is rectangular block；The regulation block is embedded in described nugget one end or is connected to described nugget one end.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114373821A (en) * | 2022-01-11 | 2022-04-19 | 中国科学院重庆绿色智能技术研究院 | Class II superlattice infrared detector with broadband absorption enhancement structure and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114373821A (en) * | 2022-01-11 | 2022-04-19 | 中国科学院重庆绿色智能技术研究院 | Class II superlattice infrared detector with broadband absorption enhancement structure and preparation method thereof |
| CN114373821B (en) * | 2022-01-11 | 2023-08-22 | 中国科学院重庆绿色智能技术研究院 | Class II superlattice infrared detector with broadband absorption enhancement structure and preparation method thereof |
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