CN108519635A - A kind of optical device and its adjusting method of adjustable surface electric field distribution - Google Patents
A kind of optical device and its adjusting method of adjustable surface electric field distribution Download PDFInfo
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- CN108519635A CN108519635A CN201810404996.0A CN201810404996A CN108519635A CN 108519635 A CN108519635 A CN 108519635A CN 201810404996 A CN201810404996 A CN 201810404996A CN 108519635 A CN108519635 A CN 108519635A
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- metal block
- optical device
- electric field
- circular metal
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/008—Surface plasmon devices
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Abstract
The present invention relates to a kind of optical devices, more particularly to a kind of optical device and its adjusting method of adjustable surface electric field distribution, including basal layer and planar structure, planar structure is formed by connecting by the identical nanometer periodic unit of multiple structures by rectangular Periodic array plane, each periodic unit includes a structural unit, each structural unit is composed of a circular metal block and an endless metal block, circular metal block is placed in endless metal block inner cavity, the circular metal block center of circle is with the endless metal block center of circle not in same position, endless metal block is made of precious metal material, circular metal block is made of magnesium metal.The structure can adjust surface electric field distribution characteristic by controlling being converted for circular metal block of material property.Later stage using when only need to carry out to inhale hydrogen as needed or adjusting to the body structure surface field distribution and local electric field resonance mode can be realized in dehydrogenation, prepare and adjusting method be simple and fast, it is easily operated.
Description
Technical field
The invention belongs to field of optical device technology, and in particular to a kind of optical device of adjustable surface electric field distribution and
Its adjusting method.
Background technology
Artificial structure's material refers to being based on electromagnetic theory, what the material having in nature artificially designed did not had
The composite material of unusual electromagnetic property.Currently, researchers are by designing the artificial nanostructure and light of various periodic arrays
Near-field coupling principle come realize field distribution adjusting and its artificial nanostructure to the modulating performance of electromagnetic wave.It is this adjustable
The optical device of local electric field characteristic is widely used in adsoption catalysis reaction, environmental analysis, food security, biological medicine point
Analysis, the fields such as biomolecule detection, becomes a research hotspot of nanophotonics in recent years.
Under the excitation of incident light, the surface enhanced electric field of noble metal nano structure has enhanced spectrum technology important
Meaning.For example, studies have shown that the enhancement factor of Surface enhanced Raman scattering is proportional to the biquadratic of surface enhanced electric field.Your gold
The distribution for belonging to nanostructured surface electric field reflects the distribution of detected biomolecule, so controllable adjustment noble metal nano structure
Surface field has important value to detecting with the relevant information in spatial position of biomolecule.
The method that tradition adjusts surface electric field distribution has the polarization direction remake structure and regulate and control incident light.The former,
It needs to remake, it is of high cost；The latter depends critically upon the pattern of nanostructure, can not realize the regulation and control of gradual change type.
Invention content
In order to solve the problems, such as that the surface electric field distribution existing in the prior art in determining structure is nonadjustable, the present invention carries
Supply a kind of optical device and its adjusting method of adjustable surface electric field distribution, the structure can be by controlling circular metal block
Being converted for material character adjusts surface electric field distribution characteristic.Later stage using when only need to carry out as needed to inhale hydrogen or dehydrogenation is made
With the adjusting that can be realized to the body structure surface field distribution and local electric field resonance mode, prepares and adjusting method is simply fast
Victory, it is easily operated.
The technical problem to be solved in the present invention is achieved through the following technical solutions：
A kind of optical device of adjustable surface electric field distribution includes basal layer and planar structure；The planar structure is by multiple knots
The identical nanometer periodic unit of structure is formed by connecting by rectangular Periodic array plane；Each periodic unit includes a structure list
Member；
Each structural unit is composed of a circular metal block and an endless metal block；
The circular metal block is placed in endless metal block inner cavity；The circular metal block center of circle and the endless metal block center of circle are not
There is a characteristic distance D between same position, two centers of circle；The circular metal block radius R1Less than endless metal block internal diameter R2；
The endless metal block is made of precious metal material；The circular metal block is made of magnesium metal.
Further, the circular metal block is equal with the endless metal block thickness.
Further, the basal layer is substrate of glass.
Further, a kind of adjusting method of the optical device of adjustable surface electric field distribution, includes the following steps：
Step 1, at room temperature, the optical device is placed in the obturator full of hydrogen, palladium catalyst is added, stood
30min or more, magnesium metal and the hydrogen of the circular metal block occur hydrogenation and generate magnesium hydride, are also equivalent to medium,
Circular metal block of material in the optical device changes, and the in vitro resonance such as generation, electric field distribution characteristic also changes therewith；
Step 2, at room temperature, the optical device after hydrogenation is placed in oxygen atmosphere, oxidative dehydrogenation, institute occur for magnesium hydride
It states circular metal block of material magnesium hydride and is reduced to magnesium metal, the electric field distribution characteristic of the optical device is restored to initially；
Through the above steps 1 and step 2 conversion, you can realize the adjusting of the optical device electric field distribution characteristic.
Compared with prior art, beneficial effects of the present invention：
1. optical device of the present invention is simple planar structure, all compare appearance relative to double-deck and multilayer chiral structure the preparation
Easily, preparation process is simple and fast, uses manpower and material resources sparingly, the later stage using when only need to carry out as needed to inhale hydrogen or dehydrogenation
The adjusting to the body structure surface field distribution can be realized, preparation process and adjusting method are simple and convenient, easily operated.
2. optical device of the present invention is realized by the suction hydrogen dehydrogenation of metal Mg to the circular metal block in the structure
The conversion of material character, passes through Mg（Metal）To MgH2（Medium）Material character conversion realize to the body structure surface field distribution
It is simple to operate with the adjusting of local electric field resonance mode, provide a kind of new thinking for the design of such optical device.
3. optical device of the present invention can make electric-field enhancing position change, when circular metal block is metal Mg,
Resonance coupling is generated between circular metal block and endless metal block, local electric field enhancing is mainly gathered in circular metal block and annular
Slit areas between metal derby, electric field show as vibrating on the directions x；When circular metal block is MgH2When, local electric field enhancing
It mainly is gathered in circular metal block surface, electric field shows as vibrating on the directions y.This local electric field enhancement effect can be applied
In near field, fields, the research of more other optical devices such as wide band light capture, wideband transmission provide a kind of new research direction
And thinking.
4. optical device of the present invention is basically unchanged in the front and back resonant position of circular metal block conversion, between only apart
The wave band of 600nm, transmissivity is also almost the same, reduces detection necessary condition, more convenient to use to be easy.
5. optical device preparation process of the present invention is simple and quick, when using in the later stage only by inhaling hydrogen or dehydrogenation reaction
It can realize and the structure is adjusted, preparation process and application method are simple and convenient, easily operated.
6. optical device of the present invention may be implemented from Mg to MgH2Gradual variation, by control be added hydrogen it is dense
Degree and total amount realize the controllable adjustment of electric field.
7. magnesium metal（Mg）It is cheap and easy to get, MgH2Including the up to hydrogen of 7.6% mass fraction, surmounts all known reversible
Metal hydride, Mg have superior delustring efficiency in ultraviolet and blue visible light wave band, can generate high frequency phasmon.
Description of the drawings
Fig. 1 is the dimensional structure diagram of optical device of the present invention；
Fig. 2 is each periodic unit structural schematic diagram of optical device of the present invention；
Fig. 3 is the front and back transmitted light spectrogram of optical device circular metal block of material property conversion of the present invention；
Fig. 4 is the distribution map of the electric field of the front and back resonance wave band of optical device circular metal block of material property conversion of the present invention.
Wherein, in Fig. 2：1, circular metal block；2, endless metal block.
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.
An embodiment of the present invention provides a kind of optical devices and its adjusting method of adjustable surface electric field distribution, solve
The surface enhanced electric field nonadjustable problem existing in the prior art in determining structure, the structure can be by controlling round gold
Belong to being converted for block of material property and adjusts surface electric field distribution characteristic.Later stage using when only need to carry out to inhale hydrogen or de- as needed
The adjusting to the body structure surface field distribution and local electric field resonance mode can be realized in hydrogen effect, prepares and adjusting method is simple
Fast, easily operated.
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：
As depicted in figs. 1 and 2, the embodiment of the present application provides a kind of optical device of adjustable surface electric field distribution, including base
Bottom and planar structure, planar structure are overlying on basal layer, and planar structure presses square by the identical nanometer periodic unit of multiple structures
Shape periodic array plane is formed by connecting.The embodiment of the present application optical device is simple planar structure, relative to double-deck and multilayer
The preparation of chiral structure is all easier, and preparation process is simple and fast, is used manpower and material resources sparingly, the later stage using when only need basis
Inhale hydrogen or dehydrogenation and adjusting to the body structure surface field distribution, preparation process and adjusting method letter can be realized
Folk prescription is just, easily operated.
Each periodic unit includes a structural unit, and each structural unit is by a circular metal block 1 and an endless metal
Block 2 is composed.As shown in Fig. 2, circular metal block 1 is placed in 2 inner cavity of endless metal block, 1 center of circle of circular metal block and annular gold
Belonging to 2 center of circle of block has a characteristic distance D, 1 radius R of circular metal block not between same position, two centers of circle1Less than endless metal
2 internal diameter R of block2, endless metal block 2 is made of precious metal material, and the present embodiment is preferably golden material.
Circular metal block 1 is made of magnesium metal, magnesium metal（Mg）It is cheap and easy to get, MgH2Including up to 7.6% mass fraction
Hydrogen surmounts all known reversible metal hydrides, and Mg has superior delustring efficiency in ultraviolet and blue visible light wave band, can
To generate high frequency phasmon.Circular metal block 1 is equal with 2 thickness of endless metal block.Basal layer is substrate of glass.
The embodiment of the present application optical device can make electric-field enhancing position change, and as shown in Fig. 4 (a), work as circle
When metal derby 1 is metal Mg, distribution map of the electric field when wavelength=1060nm generates between circular metal block 1 and endless metal block 2
Resonance coupling, local electric field enhancing are mainly gathered in the slit areas between circular metal block 1 and endless metal block 2, show as x
It is vibrated on direction；When circular metal block 1 is MgH as shown in Fig. 4 (b)2When, distribution map of the electric field when wavelength=1000nm, local electricity
Field enhancing is mainly gathered in 1 surface of circular metal block, shows as vibrating on the directions y.This local electric field enhancement effect can be by
It applies and provides a kind of new research in fields, the researchs of more other optical devices such as the capture of near field wide band light, wideband transmissions
Direction and thinking.
Particularly, circular metal block 1 can also be L-shaped Mg structures in the embodiment of the present application optical device, can be galore
Regulate and control the distribution of annulus internal electric field, when the two-arm of L-shaped structure does not wait, annulus internal electric field is chiral electric field, as Mg to MgH2
Conversion when, the distribution of chiral electric field inside annulus can be regulated and controled, so that chiral molecules detects.
Embodiment 2：
The embodiment of the present application also discloses a kind of adjusting method of the optical device of adjustable surface electric field distribution, including following step
Suddenly：
Step 1, at room temperature, optical device is placed in the obturator full of hydrogen, palladium catalyst is added, stand 30min
More than, magnesium metal and the hydrogen of circular metal block 1 occur hydrogenation and generate magnesium hydride, are also equivalent to medium, optical device
In 1 material of circular metal block change, in vitro resonance, the electric field distribution characteristic such as occur and also change therewith；
Step 2, at room temperature, the optical device after hydrogenation is placed in oxygen atmosphere, oxidative dehydrogenation, circle occur for magnesium hydride
The 1 Materials Hydrogenated magnesium-reduced of shape metal derby is magnesium metal, and the electric field distribution characteristic of optical device is restored to initially；
Through the above steps 1 and step 2 conversion, you can realize optical device electric field distribution characteristic adjusting.
The preparation process of optic structure requires very harsh, and a kind of structure can only realize its specific pattern, can not
It is made the appropriate adjustments on the basis of the structure to realize the adjustment to optical characteristics, and can only be joined by structure needed for reset
Number, prepares the structure to achieve the purpose that us again.Based on the optics device that field distribution is adjusted disclosed in embodiment 1
Part provides a kind of adjusting method of the optical device of adjustable surface electric field distribution in the present embodiment, can be by inhaling hydrogen
Or dehydrogenation enhances electric field oscillation pattern come the surface electric field distribution and local for changing the structure, the case where not preparing again
The lower property for changing the structural part material, to achieve the purpose that adjust electric field distribution characteristic.In the present embodiment, inhale hydrogen and
After the completion of dehydrogenation reaction, its distribution map of the electric field such as Fig. 4 is detected.
At normal temperatures, which is placed in the closed container containing a certain concentration hydrogen, using palladium as catalyst, this
The preferred hydrogen gas concentration of embodiment is 0.25V% and 3.0V%, nitrogen buffer gas.Hydrogen molecule is decomposed by palladium as catalyst
With metal Mg hydrogenization occurs for hydrogen atom, and it is gradual to realize to be passed through the concentration of hydrogen by control in the process
Variation, 1 controllable type of circular metal block conversion, to realize the controllable adjustment of electric field.
When hydrogen gas concentration is 0.25V%, over time, metal Mg gradually occurs suction hydrogen and acts on forming MgH2,
The conversion from completely metallized to perfect dielectric has occurred, entire hydrogenation process is completed about 100 minutes.The structure is placed in
In the high concentration hydrogen of 3.0V% volume fractions, it is almost moment to inhale hydrogen.We can adjust metal Mg by density of hydrogen
Conversion rate and conversion ratio.
Then at room temperature, the optic structure after hydrogenation is exposed in air, occur dehydrogenation, hydrogen by
It is gradually detached from from from metal Mg, MgH2It gradates as metal Mg, is reduced to original state, the electric field distribution characteristic of the structure
Restore to state before.
So suction hydrogen dehydrogenation of the embodiment of the present application optical device by metal Mg, is realized to the circle in the structure
The conversion of 1 material character of shape metal derby, passes through Mg（Metal）To MgH2（Medium）Material character conversion realize to the structure table
The adjusting of face field distribution and local electric field resonance mode, it is simple to operate, provide one for the design of such optical device
The new thinking of kind.
Embodiment 3：
Based on the optical device disclosed in embodiment 1, by using dimensional finite element method（FEM）Software for calculation COMSOL
Multiphysics carries out simulation calculation simulation test.Specific arrange parameter is as follows：
The radius R of circular metal block 11= 30 nm；2 internal diameter R of endless metal block2=50 nm, 2 outer diameter of endless metal block are 70
Nm, circular metal block 1 and 2 thickness of endless metal block are 20 nm；Between 2 liang of centers of circle of circular metal block 1 and endless metal block
The nm of characteristic distance D=10.
Model configuration is as shown in figure 3, the embodiment of the present application optical device converts front and back resonant position in circular metal block 1
It is basically unchanged, resonant wavelength is 1060nm, the % of transmissivity T=19.69 when circular metal block 1 is magnesium metal；When circular metal block 1
For magnesium hydride when resonant wavelength be 1000nm, transmissivity T=13.85%；Only at a distance of the wave band of 60nm between two resonant positions, and thoroughly
It penetrates that rate is almost the same, the necessary condition of detection can be substantially reduced, it is more convenient to use to be easy.
The application optical device preparation process is simple and quick, when using in the later stage only by inhaling hydrogen or dehydrogenation reaction just
It may be implemented to adjust the structure, preparation process and application method are simple and convenient, easily operated.And it can lead in the process
It crosses control and is passed through the amount realization of hydrogen from Mg to MgH2Gradual variation, by control be added density of hydrogen and total amount realize
The controllable adjustment of electric field.
Embodiment 4：
The embodiment of the present application optical device can make electric-field enhancing position change, as shown in figure 4, for application optical device
The distribution map of the electric field of the front and back resonance wave band of 1 material character of circular metal block conversion.As shown in Fig. 4 (a), when circular metal block 1 is
When metal Mg, resonance coupling is generated between circular metal block 1 and endless metal block 2, local electric field enhancing is mainly gathered in circle
Slit areas between metal derby 1 and endless metal block 2 shows as vibrating on the directions x；As shown in Fig. 4 (b), work as circular metal
Block 1 is MgH2When, local electric field enhancing is mainly gathered in 1 surface of circular metal block, shows as vibrating on the directions y.This local
Electric field enhancement effect can be used in the fields, the more research of other optical devices such as near field wide band light capture, wideband transmission
Provide 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 (4)
1. a kind of optical device of adjustable surface electric field distribution includes basal layer and planar structure；The planar structure is by multiple
The identical nanometer periodic unit of structure is formed by connecting by rectangular Periodic array plane；Each periodic unit includes a structure
Unit；
It is characterized in that：Each structural unit is composed of a circular metal block and an endless metal block；
The circular metal block is placed in endless metal block inner cavity；The circular metal block center of circle and the endless metal block center of circle are not
There is a characteristic distance D between same position, two centers of circle；The circular metal block radius R1Less than endless metal block internal diameter R2；
The endless metal block is made of precious metal material；The circular metal block is made of magnesium metal.
2. optical device according to claim 1, it is characterised in that：The circular metal block is thick with the endless metal block
It spends equal.
3. optical device according to claim 2, it is characterised in that：The basal layer is substrate of glass.
4. by the adjusting method of any optical device described in claim 1-3, it is characterised in that：Include the following steps：
Step 1, at room temperature, the optical device is placed in the obturator full of hydrogen, palladium catalyst is added, stood
30min or more, magnesium metal and the hydrogen of the circular metal block occur hydrogenation and generate magnesium hydride, are also equivalent to medium,
Circular metal block of material in the optical device changes, and the in vitro resonance such as generation, electric field distribution characteristic also changes therewith；
Step 2, at room temperature, the optical device after hydrogenation is placed in oxygen atmosphere, oxidative dehydrogenation, institute occur for magnesium hydride
It states circular metal block of material magnesium hydride and is reduced to magnesium metal, the electric field distribution characteristic of the optical device is restored to initially；
Through the above steps 1 and step 2 conversion, you can realize the adjusting of the optical device electric field distribution characteristic.
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