CN108549165A - A kind of Saint Andrew's cross shape optical polarizator and its adjusting method - Google Patents
A kind of Saint Andrew's cross shape optical polarizator and its adjusting method Download PDFInfo
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- CN108549165A CN108549165A CN201810404995.6A CN201810404995A CN108549165A CN 108549165 A CN108549165 A CN 108549165A CN 201810404995 A CN201810404995 A CN 201810404995A CN 108549165 A CN108549165 A CN 108549165A
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- G—PHYSICS
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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 optical devices, more particularly to a kind of Saint Andrew's cross shape optical polarizator and its adjusting method, it is made of by rectangular Periodic array arrangement the identical nanometer periodic unit of multiple structures, each periodic unit includes a structural unit, and structural unit is square body；Structural unit is made of precious metal material, oblique " ten " font through-hole is equipped among each structural unit, in structural unit plane, the second gap both ends are respectively equipped with the first metal derby and the second metal derby；First metal derby and the second metal derby are made of magnesium metal.Saint Andrew's cross shape optical polarizator structure of the present invention can inhale conversion of the hydrogen dehydrogenation from complete metal to perfect dielectric by magnesium metal, achieve the purpose that the asymmetric transmission characteristic for adjusting optical polarizator, adjusting method is simple and convenient, and a kind of new thinking is provided 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 Saint Andrew's cross shape optical polarizator and its adjusting side
Method.
Background technology
Asymmetric transmission（Asymmetric Transmission, AT）Refer to Transmission system to entering along different transmission directions
The electromagnetic wave penetrated shows different conversion performances.Such as Fig. 1（a）It is shown, a polarization conversion asymmetric transmission system A is come
It says, the left-handed rotation incident from the fronts system A（Left circularly polarized, LCP）After system A, receive
Right-handed rotation（Right circularly polarized, RCP）Transmissivity be, from the left-handed of system A back surface incidents
The transmissivity for the right-handed rotation that light receives after system A is.Wherein arrow direction indicate from the front of Transmission system or
Back surface incident, subscript "-" indicate that incident light is left-handed rotation, and "+" indicates that emergent light is right-handed rotation.The total transmission of one polarization state light
Rate is：
, .
Then the asymmetric transmission of system A polarization conversions can be expressed as：
Change further through Lorentz：
, = It obtains：
Above-mentioned expression formula shows along circularly polarized light incidence-zSwash in direction
The value of the asymmetric transmission of hair and+zThe value of the asymmetric transmission of direction excitation is opposite.It is stated with specific in order to clear,
We provide circularly polarized light edge-in the present inventionzDirection is incident.
Its physical significance such as Fig. 1 indicated（b）It is shown, 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.For from back surface incident when asymmetric transmission value be identical.
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, realizes that the electromagnetic wave for different polarization converts using coupling between layers mostly.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
It is complicated in its, it generally is all difficult to prepare in an experiment, actual production manufacture difficulty 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 and control of different polarization transformation modes
Study carefully.When usually changing the geometric parameter of a structure, the resonant position of polarization conversion and corresponding asymmetric transmission spectrum and
Intensity, but be the positive and negative several of asymmetric transmission signal for the adjusting of the relative size of the polarization conversion of two kinds of polarised lights of left-right rotary
Do not influence.And a certain specific pattern can only be realized or be generated to a kind of specific structure, cannot achieve in certain journey
Adjusting on degree just needs to remake new structure to change pattern or a kind of new pattern of generation, and fabrication cycle is long,
Labour cost is high.
Invention content
Complicated, the AT signals of single layer chiral structure are prepared in order to solve double-deck or multilayered structure existing in the prior art
Small, the problem of polarization conversion characteristic of polarised light is adjusted, the present invention provides a kind of Saint Andrew's cross shape optical polarizator and its adjustings
Method, the structure can adjust asymmetric transmission pattern by controlling the materials behavior of the first metal derby and the second metal derby
The conversion of size and location and its asymmetric transmission signal code.The structure can be integrally formed, the later stage using when only need basis
It carries out inhaling hydrogen dehydrogenation and adjusting to the structure asymmetric transmission characteristic can be realized, prepare and adjusting method is simply square
Just, easily operated.
The technical problem to be solved in the present invention is achieved through the following technical solutions：
A kind of Saint Andrew's cross shape optical polarizator presses rectangular Periodic array arrangement structure by the identical nanometer periodic unit of multiple structures
At；
Each periodic unit includes a structural unit；The structural unit is square body；The structural unit is by your gold
Belong to material to be made；
It is equipped with oblique " ten " font through-hole among each structural unit；Tiltedly " ten " the font through-hole is by the first gap and the
Two gaps intersect composition；Second gap is parallel with the directions y；Second gap is in the y-direction up and down；
In the structural unit plane, second gap both ends are respectively equipped with the first metal derby and the second metal derby；It is described
First metal derby and the second metal derby are made of magnesium metal.
Further, first gap has an angle with the directions xα；Tiltedly the first gap of " ten " font through-hole and the x
Angular separation α is acute angle.
Further, first metal derby and the second metal derby are right-angled trapezium；First metal derby and second
The right-angled trapezium bevel edge of metal derby is parallel to each other with first gap.
Further, tiltedly " ten " font the first gap width of through-hole d1With the second gap width d2It is equal；
The height h and the second gap width d of first metal derby and the second metal derby2It is equal；
The thickness of first metal derby and the second metal derby and the structural unit is equal.
Further, the adjusting method of the asymmetric transmission characteristic of the optical polarizator, includes the following steps：
Step 1, at room temperature, the optical polarizator is placed in the obturator full of hydrogen, palladium catalyst is added, stood
The magnesium metal of 30min or more, first metal derby and second metal derby occurs hydrogenation with hydrogen and generates magnesium hydride,
Also it is equivalent to medium so that the structure of the optical polarizator changes, and asymmetric transmission characteristic also becomes therewith
Change；
Step 2, at room temperature, the optical polarizator after hydrogenation being placed in oxygen atmosphere, oxidative dehydrogenation occurs for magnesium hydride,
First metal derby and second metal derby are reduced to magnesium metal, the asymmetric transmission characteristic reduction of the optical polarizator
To initial；
Through the above steps 1 and step 2 conversion, you can realize the adjusting of the optical polarizator asymmetric transmission signal.
Compared with prior art, beneficial effects of the present invention：
1. optical polarizator of the present invention is planar structure, there is planar chiral, different rotatory polarizations can be generated with different polarization
Conversion ratio generates larger asymmetric transmission signal compared to other planar structures, and maximum can reach AT=27%, and
It is simple in structure, it is all easier relative to double-deck and multilayer chiral structure the preparation, there is very strong promotion and application value.
2. optical polarizator of the present invention is planar chiral structure, circularly polarized light can obtain a variety of polarization states with this configuration
Light, i.e., have left circularly polarized light, right-circularly polarized light, linearly polarized light and elliptically polarized light in emergent light, then pass through other
Structure such as polarizing film can obtain the light of any of which polarization state, and be used.
3. optical polarizator magnesium metal of the present invention occurs to inhale hydrogen dehydrogenation, pass through magnesium（Metal）To magnesium hydride（Medium）'s
The conversion to the first metal derby and the second metal derby state is realized in conversion, changes the current direction between gap, to complete to this
The adjusting of the asymmetric transmission characteristic of invention optical polarizator such as changes AT intensity, resonant position and realizes chiral inversion, changes
Polarization characteristic converts symbol etc., simple to operate, this result not only has certain set to Future Design optical polarizator
Directive function is counted, the design of more other optical devices provides a kind of new research direction and thinking.
4. planar chiral structure can be integrally formed in optical polarizator of the present invention, preparation process is simple and fast, makes in the later stage
Used time only needs to carry out to inhale hydrogen dehydrogenation as needed and adjusting to the structure asymmetric transmission characteristic can be realized, and prepares work
Skill and application method are simple and convenient, easily operated.
5. using magnesium metal in optical polarizator of the present invention, metal Mg is cheap and easy to get, and MgH2 includes that up to 7.6% mass is divided
Several hydrogen, surmounts all known reversible metal hydrides, and Mg is imitated in ultraviolet and blue visible light wave band with superior delustring
Can, high frequency phasmon can be generated, this is the performance not available for other metals.
Description of the drawings
Fig. 1 is the asymmetric transmission principle schematic of polarization conversion；
Fig. 2 is optical polarizator schematic diagram of the present invention；
Fig. 3 is optical polarizator structural upright schematic diagram of the present invention；
Fig. 4 is asymmetric transmission conversion spectrogram of the optical polarizator of the present invention before and after inhaling hydrogen dehydrogenation.
Specific implementation mode
Further detailed description is done to the present invention with reference to specific embodiment, but embodiments of the present invention are not limited to
This.
Embodiment 1：
Such as Fig. 2 and as indicated at 3, a kind of Saint Andrew's cross shape optical polarizator presses rectangle by the identical nanometer periodic unit of multiple structures
Periodic array arrangement is constituted, and each periodic unit includes a structural unit, and structural unit is square body, and structural unit is by your gold
Belong to material to be made, the present embodiment is preferably golden material.
Oblique " ten " font through-hole is equipped among each structural unit, oblique " ten " font through-hole is by the first gap 1 and second
Gap 2 intersects composition, and the second gap 2 is parallel with the directions y, and the second gap 2 is in the y-direction up and down, flat in structural unit
In face, 2 both ends of the second gap are respectively equipped with the first metal derby 3 and the second metal derby 4, and the first metal derby 3 and the second metal derby 4 are
It is made of magnesium metal.
Optical polarizator in the present embodiment is planar chiral structure, and circularly polarized light can obtain a variety of inclined with this configuration
The light of polarization state has left circularly polarized light, right-circularly polarized light, linearly polarized light and elliptically polarized light, then passes through in emergent light
Other structures such as polarizing film can obtain the light of any of which polarization state, and be used.
Optical polarizator is planar structure in the present embodiment, has planar chiral, difference can be generated to different rotatory polarizations
Polarization conversion rate, asymmetric transmission signal strength is all big compared to other planar structures, the front and back spectrum such as Fig. 4 conversions
Figure, when the first metal derby and the second metal derby are magnesium hydride, in wavelength X=920nm, AT=- 27%, than general plane hand
The AT signals of property structure are all strong.
First gap 1 has an angle with the directions xα, oblique the first gap of " ten " the font through-hole 1 and angular separations x α is sharp
Angle.First metal derby 3 and the second metal derby 4 are right-angled trapezium, and the right-angled trapezium of the first metal derby 3 and the second metal derby 4 is oblique
Side is parallel to each other with the first gap 1.Tiltedly 1 width d of the first gap of " ten " font through-hole1With 2 width d of the second gap2It is equal, the
The 2 width d of height h and the second gap of one metal derby 3 and the second metal derby 42It is equal, the first metal derby 3 and the second metal derby 4 with
The thickness t of structural unit is equal.
The stereochemical structure of the optical polarizator structure of the present embodiment as shown in figure 3, when LCP and RCP respectively from structure just
When the incidence of face, the transmissivity that incident light and emergent light convert is different, to generate asymmetric reflected effect, realizes the inclined of light
It shakes, generation obtains AT signals.Especially when incident light is left-hand polarization light, emergent light is dextropolarization light, transmissivity ratio is converted
The height that incident light is right-handed polarized light, emergent light is left-handed deflect light.And the optical polarizator structure in the present embodiment is hand
Mild-natured face, it is simple in structure, it is all easier relative to double-deck and multilayer chiral structure the preparation, there are very strong promotion and application
Value.
In the present embodiment, a kind of adjusting method of the asymmetric transmission characteristic of optical polarizator includes the following steps：
Step 1, at room temperature, optical polarizator is placed in the obturator full of hydrogen, palladium catalyst is added, stood
30min or more, the magnesium metal in the first metal derby 3 and the second metal derby 4 occur hydrogenation with hydrogen and generate magnesium hydride, also
It is equal to medium so that the structure of optical polarizator changes, and asymmetric transmission characteristic is also with changing；
Step 2, at room temperature, the optical polarizator after hydrogenation being placed in oxygen atmosphere, oxidative dehydrogenation occurs for magnesium hydride,
First metal derby 3 and the second metal derby 4 are reduced to magnesium metal, and the asymmetric transmission characteristic of optical polarizator is restored to initially.
Through the above steps 1 and step 2 conversion, you can realize optical polarizator asymmetric transmission signal adjusting.
Optical polarizator planar chiral structure in the present embodiment can be integrally formed, and preparation process is simple and fast, in the later stage
It only needs to carry out to inhale hydrogen dehydrogenation when use as needed and adjusting to the structure asymmetric transmission characteristic can be realized, prepare
Technique and adjusting method are simple and convenient, easily operated.
Embodiment 2：
The preparation process of optical polarizator structure requires very harsh, and a kind of structure can only realize its specific pattern, Wu Fa
It is made the appropriate adjustments on the basis of the structure to realize the conversion and adjustment of different mode, and structure needed for reset can only be passed through
And its parameter, the structure is prepared again to achieve the purpose that shaping modes.It is with the Saint Andrew's cross shape optical polarizator in embodiment 1
Basis, a kind of Saint Andrew's cross shape optical polarizator is provided in the present embodiment to change the structure by inhaling hydrogen and dehydrogenation
The state of first metal derby 3 and the second metal derby 4, the field distribution of the structure before and after condition conversion, transmissivity can occur
Variation.Mg is cheap and easy to get, MgH2Including the up to hydrogen of 7.6% mass fraction, surmounts all known reversible metal hydrides, Mg
There is superior delustring efficiency in ultraviolet and blue visible light wave band, high frequency phasmon can be generated, this is other metal institutes
The performance not having.Therefore this structure can achieve the purpose that adjust circularly polarized light conversion characteristic in the case where not preparing again.
In the present embodiment, after the completion of inhaling hydrogen and dehydrogenation reaction, its asymmetric transmission signal is tested in 400 ~ 1300nm wave bands.
At normal temperatures, which is placed in the closed container containing a certain concentration hydrogen, using palladium as catalyst,
The preferred hydrogen gas concentration of the present embodiment is 0.25V% and 3.0V%, nitrogen buffer gas.Palladium decomposes hydrogen molecule as catalyst
For hydrogen atom, hydrogenization occurs with magnesium metal.
When hydrogen gas concentration is 0.25V%, over time, magnesium metal gradually occurs suction hydrogen and acts on being formed
MgH2, the conversion from completely metallized to perfect dielectric has occurred, entire hydrogenation process is completed about 100 minutes.This is sent out
Mingguang City learns polarizer structure and is placed in the high concentration hydrogen of 3.0V% volume fractions, and it is almost moment to inhale hydrogen.We can pass through
Density of hydrogen adjusts the conversion rate and conversion ratio of magnesium metal.
Then at room temperature, the polarizer structure after hydrogenation is exposed in air, dehydrogenation occurs, hydrogen is gradual
It is detached from from from magnesium metal, MgH2It gradates as metal Mg, is reduced to original state, the circularly polarized light conversion characteristic of the structure
State before being also restored to.
Embodiment 3：
Based on the optical polarizator planar structure described in embodiment 1 and embodiment 2, by using dimensional finite element method（FEM）
Software for calculation COMSOL Multiphysics carry out calculating simulation experiment.The parameter of setting structure：First gap lengthl 1 =
300 nm, the second gap lengthl 2 =500nm, the first gap width and the second transverse joint widthd 1 = d 2 =50 nm, the first gold medal
Belong to block and the second metal derby height nm of h=50, the first gap and the angular separations xα=30。The period of total isPx = Py =
500 nm, thicknesst =60 nm。
As shown in figure 4, being that optical polarizator of the present invention is inhaling the front and back asymmetric transmission conversion light of hydrogen dehydrogenated state variation
Spectrogram, wherein T+- are LCP incident, receive RCP signals, and T-+ is RCP incident, receives LCP signals.We can be clear from figure
Chu obtains：
When the first metal derby 3 and the second metal derby 4 and for magnesium metal when, there are three signals in spectrogram, respectively：λ=
690nm, AT=- 3%；λ=900nm, AT=- 5%；In λ=1000nm, AT=3%.
When metal derby perfect dielectric（MgH2）, convert in spectrogram, three signals are respectively：In λ=660nm,
AT = 2%；λ=820nm, AT=- 12%；In λ=920nm, AT=- 27%.
The intensity of its asymmetric transmission signal and position be all before and after 4 condition conversion of the first metal derby 3 and the second metal derby
Changed, the symbol of especially its asymmetric transmission signal is also inverted, this has in the design of optical polarizator
Prodigious application value and directive significance.
Therefore, Saint Andrew's cross shape optical polarizator of the invention may be implemented in the structure of embodiment 1 to optical polarization
The dynamic regulation of device asymmetric transmission.Optical polarizator magnesium metal in the present embodiment occurs to inhale hydrogen dehydrogenation, passes through magnesium gold
Belong to conversion of the conversion realization of magnesium hydride medium to the first metal derby and the second metal derby state, to complete to light of the present invention
The adjusting of the asymmetric transmission characteristic of polarizer is learned, such as increases AT intensity, change resonant position and realizes chiral inversion, polarization is special
Property conversion symbol change, it is simple to operate, this result not only to Future Design optical polarizator have certain design
The design of directive function, more other optical devices provides a kind of new research direction and thinking.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
The specific implementation of the present invention is confined to these explanations.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 the present invention's
Protection domain.
Claims (5)
1. a kind of Saint Andrew's cross shape optical polarizator presses rectangular Periodic array arrangement structure by the identical nanometer periodic unit of multiple structures
At；It is characterized in that：
Each periodic unit includes a structural unit；The structural unit is square body；The structural unit is by your gold
Belong to material to be made；
It is equipped with oblique " ten " font through-hole among each structural unit；Tiltedly " ten " the font through-hole is by the first gap（1）
With the second gap（2）Intersect composition；Second gap（2）It is parallel with the directions y；Second gap（2）On in the y-direction
Lower perforation；
In the structural unit plane, second gap（2）Both ends are respectively equipped with the first metal derby（3）With the second metal derby
（4）；First metal derby（3）With the second metal derby（4）It is made of magnesium metal.
2. optical polarizator according to claim 1, it is characterised in that：First gap（1）There is a folder with the directions x
Angleα；Tiltedly first gap of " ten " font through-hole（1）It is acute angle with the angular separations x α.
3. optical polarizator according to claim 2, it is characterised in that：First metal derby（3）With the second metal derby
（4）It is right-angled trapezium；First metal derby（3）With the second metal derby（4）Right-angled trapezium bevel edge with it is described first seam
Gap（1）It is parallel to each other.
4. optical polarizator according to claim 3, it is characterised in that：Tiltedly first gap of " ten " font through-hole（1）
Width d1With the second gap（2）Width d2It is equal；
First metal derby（3）With the second metal derby（4）Height h and second gap（2）Width d2It is equal；
First metal derby（3）With the second metal derby（4）It is equal with the thickness t of the structural unit.
5. according to the adjusting method of the asymmetric transmission characteristic of any optical polarizator in claim 1-4, feature exists
In：Include the following steps：
Step 1, at room temperature, the optical polarizator is placed in the obturator full of hydrogen, palladium catalyst is added, stood
30min or more, first metal derby（3）With second metal derby（4）Magnesium metal and hydrogen hydrogenation occur generate
Magnesium hydride is also equivalent to medium so that the structure of the optical polarizator changes, asymmetric transmission characteristic also with
It changes；
Step 2, at room temperature, the optical polarizator after hydrogenation being placed in oxygen atmosphere, oxidative dehydrogenation occurs for magnesium hydride,
First metal derby（3）With second metal derby（4）It is reduced to magnesium metal, the asymmetric transmission of the optical polarizator is special
Property be restored to it is initial；
Through the above steps 1 and step 2 conversion, you can realize the adjusting of the optical polarizator asymmetric transmission signal.
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| CN114740562A (en) * | 2022-05-11 | 2022-07-12 | 曲阜师范大学 | T-shaped optical diode capable of realizing dual-band polarization conversion |
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