CN110082385A - A kind of micro-nano metal structure and its application for realizing circular dichroism - Google Patents
A kind of micro-nano metal structure and its application for realizing circular dichroism Download PDFInfo
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- CN110082385A CN110082385A CN201910348991.5A CN201910348991A CN110082385A CN 110082385 A CN110082385 A CN 110082385A CN 201910348991 A CN201910348991 A CN 201910348991A CN 110082385 A CN110082385 A CN 110082385A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/16—Investigating or analyzing materials by the use of thermal means by investigating thermal coefficient of expansion
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
Abstract
The present invention relates to micronano optical technical fields, more particularly to a kind of micro-nano metal structure and its application for realizing circular dichroism, dynamic regulation is carried out to the circular dichroism of invention micro-nano metal structure by the spacing g realization adjusted between perpendicular body I and perpendicular body II, change the degree of coupling between two L-shaped structures of micro-nano metal structure using the size of the spacing g between perpendicular body I and perpendicular body II, to realize the dynamic regulation to circular dichroism, traditional circular dichroism, which is adjusted, mainly to be realized by coupled modes in the height direction, structure preparation is complicated, requirement to experiment condition and detecting instrument is also especially high, and the micro-nano metal structure of realization circular dichroism of the invention adjusts the simple to operate of circular dichroism signal, it is easily achieved, a kind of new thinking is provided for the dynamic regulation of plane circular dichroism signal.
Description
Technical field
The invention belongs to micro-nano photonic arts, and in particular to a kind of micro-nano metal structure for realizing circular dichroism and
It is applied.
Background technique
Chirality refers to its own property that cannot be completely coincident with mirror image, and wherein chiral material and its mirror image are mutually known as chirality
Corresponding body.The structure of many substances all has chirality, such as protein, DNA etc. in nature.Chirality is especially heavy to the meaning of life
It wants, so the chirality of detecting material becomes the hot spot of numerous researchers research.Usually utilize circular dichroism (Circular
Dichroism, CD) carry out the chirality of detecting material or structure, CD can be defined as Chiral Media for different circularly polarized lights
Absorptivity is different, and difference is circular dichroism.
Since the chiral signals such as biomolecule are fainter, and it is usually located near ultraviolet band, is not easy to detect, so logical
The property of research artificial metal's chiral structure is crossed to the chiral property of more deep understanding and the essence of generation circular dichroism
Become particularly significant.
Tradition realizes that the metal chiral structure of circular dichroism mostly uses greatly three-dimensional structure, and each layer of the usual class formation is simultaneously
Do not have chirality, but due to there is rotation angle or relative displacement between layers, so that total has chirality.For this
The chiral structure of kind multilayer generally all has good circular dichroism, but since its structure is complicated, it is general all difficult in an experiment
With preparation, actual production manufacture difficulty is bigger.Single layer chiral structure also has circular dichroism, and preparation method is relative to bilayer
It is all easier with multilayered structure.And planar chiral structure is generally all very complicated, and its circular dichroism is difficult to adjust.
Summary of the invention
In order to solve planar chiral structure existing in the prior art, structure is complicated, and circular dichroism adjusts difficult
Problem, the present invention provides a kind of micro-nano metal structures and its application method for realizing circular dichroism, utilize simple double L structures
Between gap generate different magnetic dipoles under the radiation situation of left circularly polarized light and right-circularly polarized light, lead to this hair
Bright micro-nano metal structure generates chiral difference, to obtain apparent circular dichroism signal.By adjusting between double L-shaped structures
It is spaced the available different circular dichroism signal of g, to realize the purpose of dynamic regulation circular dichroism signal.
The technical problem to be solved in the present invention is achieved through the following technical solutions:
A kind of micro-nano metal structure for realizing circular dichroism, the micro-nano metal structure are single by multiple structures identical period
First plane is formed by connecting；It include a double L-shaped structure unit in each periodic unit；Each structural unit includes
Horizontal body I, horizontal body II, perpendicular body I, perpendicular body II；The horizontal body I is vertical with the perpendicular body I to be connect；The horizontal body II and the perpendicular body II
Vertical connection；The horizontal body I is arranged in parallel with the horizontal body II；The perpendicular body I is arranged in parallel with the perpendicular body II；The horizontal body
I, horizontal body II, perpendicular body I, perpendicular body II are made of precious metal material Au.
Further, the horizontal body I is identical with horizontal II structure of body, and the perpendicular body I is identical with perpendicular II structure of body；The perpendicular body
I length is the 4/3 of I length of horizontal body；The horizontal body I, horizontal body II, perpendicular body I, perpendicular body II width and thickness be equal.
Further, the length of the horizontal body I and horizontal body II is a=150nm；The length of the perpendicular body I and perpendicular body II is b
=200nm；The horizontal body I, perpendicular body I, erects the width of body II as w=40nm at horizontal body II；With a thickness of h=30nm.
Further, a kind of application of micro-nano metal structure that realizing circular dichroism, comprising the following steps:
Step 1, the spacing g between perpendicular body I and perpendicular body II is adjusted, different spacing g and the CD corresponding to it are measured and recorded
Signal obtains corresponding table so that the spacing g and CD signal between perpendicular body I and perpendicular body II are corresponded；
Step 2, in the first temperature T1Under, fill thermal expansion material between the perpendicular body I and perpendicular body II, open light source with
Detector measures and records the CD signal of micro-nano metal structure at this temperature, and is determined by corresponding to table obtained in step 1
The spacing g between body I and perpendicular body II is erected under the state1；
Step 3, it keeps the environment other conditions of step 2 constant, only changes environment temperature T1To second temperature T2, thermal expansion
Deformation occurs for material, opens optical light source and detector, measures and records second temperature T2The CD signal of lower micro-nano metal structure, and lead to
The correspondence table crossed in step 1 determines the spacing g erected between body I and perpendicular body II under the state2；
Step 4, the spacing g obtained by step 2 and step 31And g2With the temperature value T recorded1And T2It is derived from this
The coefficient of thermal expansion material.
Compared with prior art, beneficial effects of the present invention:
1. the micro-nano metal structure of realization circular dichroism of the invention, by adjusting the spacing g between perpendicular body I and perpendicular body II
It realizes and dynamic regulation is carried out to the circular dichroism of invention micro-nano metal structure, utilize the big of the spacing g between perpendicular body I and perpendicular body II
The small degree of coupling changed between two L-shaped structures of micro-nano metal structure, thus realize the dynamic regulation to circular dichroism, tradition
Circular dichroism, which is adjusted, mainly to be realized by coupled modes in the height direction, and structure preparation is complicated, to experiment condition and
The requirement of detecting instrument is also especially high, and the micro-nano metal structure of realization circular dichroism of the invention adjusts circular dichroism signal
It is simple to operate, it is easy to accomplish, a kind of new thinking is provided for the dynamic regulation of plane circular dichroism signal.
2. the micro-nano metal structure of realization circular dichroism of the invention, structure is alternatively arranged by two simple L-type structures
It forming, structure is simple, and it is easily prepared, and Physical Mechanism is cheer and bright, has a good application prospect.
Detailed description of the invention
Fig. 1 is the schematic diagram that the circular dichroism signal of the embodiment of the present application micro-nano metal structure generates；
Fig. 2 is 1 metal micro-nanostructure schematic diagram of the embodiment of the present application；
Fig. 3 is 1 metal micro-nanostructure stereoscopic schematic diagram of the embodiment of the present application；
Fig. 4 is the absorption spectrum of metal micro-nanostructure and circular dichroism figure in the embodiment of the present application 1；
Fig. 5 is current distribution of the metal micro-nanostructure at absorption peak in the embodiment of the present application 1；
Fig. 6 is that the corresponding table of spacing g and CD signal between body I and perpendicular body II is erected in the embodiment of the present application 2.
In figure: 1, horizontal body I；2, horizontal body II；3, body I is erected；4, body II is erected.
Specific embodiment
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:
A kind of micro-nano metal structure for realizing circular dichroism, micro-nano metal structure are put down by the identical periodic unit of multiple structures
Face is formed by connecting, and includes a double L-shaped structure unit in each periodic unit, each structural unit includes horizontal body I 1, horizontal body
II 2, body I 3, perpendicular body II 4 are erected, horizontal body I 1 is vertical with perpendicular body I 3 to be connect, and horizontal body II 2 is vertical with perpendicular body II 4 to be connect；Horizontal body I 1 and cross
Body II 2 is arranged in parallel, and perpendicular body I 3 is arranged in parallel with perpendicular body II 4, and horizontal body I 1, horizontal body II 2, perpendicular body I 3, perpendicular body II 4 are by noble metal
Materials A u is made.
Specifically:
The present embodiment micro-nano metal structure belongs to planar chiral structure, when incident light irradiates the present embodiment micro-nano metal structure
When, different absorptions are generated to generate circular dichroism to left and right rounding polarised light.
As shown in Figures 2 and 3, horizontal body I 1 is identical with horizontal II 2 structure of body, and perpendicular body I 3 is identical with perpendicular II 4 structure of body, erects body I 3
Length be the 4/3 of horizontal I 1 length of body, horizontal body I 1, horizontal body II 2, perpendicular body I 3, perpendicular body II 4 width and thickness be equal.
Specifically:
The size and production principle of the present embodiment chirality micro-nano metal structure circular dichroism are as follows:
Calculating simulation test is carried out by using dimensional finite element method FEM software for calculation COMSOL Multiphysics,
Design parameter is preferably as follows:
The side length in the period is Px=Py=400nm, and the length of horizontal body I 1 and horizontal body II 2 is a=150nm, erects body I 3
Be b=200nm with the length of perpendicular body II 4, horizontal body I 1, horizontal body II 2, perpendicular body I 3, perpendicular body II 4 width be w=40nm, with a thickness of
H=30nm erects the spacing g=10nm between body I and perpendicular body II.
The micro-nano metal structure is made of precious metal material, it is preferable that the present embodiment micro-nano metal structure is made of Au.
As shown in figure 4, for the abosrption spectrogram and circular dichroism figure of the embodiment of the present application chirality micro-nano metal structure,
Wherein, A-Indicate the absorptivity of left circularly polarized light, A+Indicate the absorptivity of right-circularly polarized light, CD indicates the big of circular dichroism
It is small.From in Fig. 4 we can be clearly seen that: the structure goes out at λ=740nm and λ=1200nm respectively at λ=680nm
Existing three absorption peaks, wherein at λ=740nm, A-=14.9%, A+=30.2%, there is more apparent difference, therefore cause
At the wavelength, that is, λ=740nm, there is an apparent CD paddy, size are as follows: CD=15.2%.
The principle of circular dichroism is generated in order to further illustrate the present embodiment chirality micro-nano metal structure, the present embodiment discloses
Current distribution at absorption peak λ=740nm, as shown in Figure 5:
Gap location in right-circularly polarized light irradiation, between perpendicular body I 3 and perpendicular body II 4 and perpendicular body I 3 and perpendicular body II 4
Electric current form the magnetic dipoles of 8 types, and the gap location between perpendicular body I 3 and perpendicular body II 4 and perpendicular body I 3 and perpendicular body II 4
Electric current it is also bigger, therefore in right-circularly polarized light irradiation, which generates very big suction
It receives；And the gap location under the irradiation of left circularly polarized light, between perpendicular body I 3 and perpendicular body II 4 and perpendicular body I 3 and perpendicular body II 4
Electric current form the magnetic dipole of S type, but size of current is than small in the case where right-circularly polarized light irradiates, so as to cause it is left-handed with it is right
Absorption difference is revolved, the generation of a biggish CD signal is caused.
Embodiment 2:
Based on a kind of micro-nano metal structure for realizing circular dichroism disclosed in embodiment 1, present embodiment discloses a kind of realities
The application of the micro-nano metal structure of existing circular dichroism, specifically includes the following steps:
Step 1, adjust the spacing g between perpendicular body I 3 and perpendicular body II 4, measure and record different spacing g and its corresponding to
It is as shown in Figure 6 to obtain corresponding table so that the spacing g and CD signal between perpendicular body I 3 and perpendicular body II 4 are corresponded for CD signal；
Step 2, in the first temperature T1Under, thermal expansion material is filled between the perpendicular body I 3 and perpendicular body II 4, opens light source
With detector, the CD signal of micro-nano metal structure at this temperature is measured and recorded, and true by corresponding to table obtained in step 1
The spacing g between body I 3 and perpendicular body II 4 is erected under the fixed state1；
Step 3, it keeps the environment other conditions of step 2 constant, only changes environment temperature T1To second temperature T2, thermal expansion
Deformation occurs for material, opens optical light source and detector, measures and records second temperature T2The CD signal of lower micro-nano metal structure, and lead to
The correspondence table in step 1 is crossed, as shown in fig. 6, determining the spacing g erected between body I 3 and perpendicular body II 4 under the state2；
Step 4, the spacing g obtained by step 2 and step 31And g2With the temperature value T recorded1And T2It is derived from this
The coefficient of thermal expansion material.
Specifically:
Thermal expansion material can change when external force is not added with the variation of local environment temperature.It in the present embodiment, will be hot
Expanding material is filled in the gap location between perpendicular body I 3 and perpendicular body II 4, and the variation of thermal expansion material can cause chiral micro-nano metal
The change of structure interval, so as to cause the variation of chiral micro-nano metal structure CD size and location.Since a temperature can correspond to
A kind of CD signal, therefore the variation of temperature directly can be measured by measuring the CD signal of chiral micro-nano metal structure, especially
It is especially small suitable for thermal expansion deformation quantity, to testing requirements height, especially it is accurate to the material of Nano grade.
The measurement to temperature may be implemented in micro-nano metal structure in the present embodiment, simple to operate, is temperature sensing
The research of device provides a kind of new 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
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 (4)
1. a kind of micro-nano metal structure for realizing circular dichroism, it is characterised in that: the micro-nano metal structure is by multiple structure phases
Same periodic unit plane is formed by connecting；
It include a double L-shaped structure unit in each periodic unit；
Each structural unit includes horizontal body I (1), horizontal body II (2), perpendicular body I (3), perpendicular body II (4)；
The horizontal body I (1) is vertical with the perpendicular body I (3) to be connect；The horizontal body II (2) is vertical with the perpendicular body II (4) to be connect；
The horizontal body I (1) is arranged in parallel with the horizontal body II (2)；The perpendicular body I (3) is arranged in parallel with the perpendicular body II (4)；
The horizontal body I (1), horizontal body II (2), perpendicular body I (3), perpendicular body II (4) are made of precious metal material Au.
2. micro-nano metal structure according to claim 1, it is characterised in that: the horizontal body I (1) and horizontal body II (2) structure
Identical, described perpendicular II (4) structure of body I (3) He Shuti is identical；The length of the perpendicular body I (3) is the 4/ of horizontal body I (1) length
3；The horizontal body I (1), horizontal body II (2), perpendicular body I (3), perpendicular body II (4) width and thickness be equal.
3. micro-nano metal structure according to claim 2, it is characterised in that: the length of the horizontal body I (1) and horizontal body II (2)
Degree is a=150nm；The length of perpendicular body I (3) He Shuti II (4) is b=200nm；The horizontal body I (1), horizontal body II (2),
Perpendicular body I (3), the width for erecting body II (4) are w=40nm, with a thickness of h=30nm.
4. the application of any micro-nano metal structure according to claim 1 to 3, it is characterised in that: the following steps are included:
Step 1, adjust the spacing g between perpendicular body I (3) and perpendicular body II (4), measure and record different spacing g with its corresponding to
CD signal obtains corresponding table so that the spacing g and CD signal between perpendicular body I (3) and perpendicular body II (4) are corresponded；
Step 2, in the first temperature T1Under, thermal expansion material is filled between perpendicular body I (3) He Shuti II (4), opens light source
With detector, the CD signal of micro-nano metal structure at this temperature is measured and recorded, and true by corresponding to table obtained in step 1
The spacing g between body I (3) and perpendicular body II (4) is erected under the fixed state1；
Step 3, it keeps the environment other conditions of step 2 constant, only changes environment temperature T1To second temperature T2, thermal expansion material
Deformation occurs, opens optical light source and detector, measures and records second temperature T2The CD signal of lower micro-nano metal structure, and pass through step
Correspondence table in rapid 1 determines the spacing g erected between body I (3) and perpendicular body II (4) under the state2；
Step 4, the spacing g obtained by step 2 and step 31And g2With the temperature value T recorded1And T2It is swollen to be derived from the heat
The coefficient of swollen material.
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Cited By (6)
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| CN110441114A (en) * | 2019-09-05 | 2019-11-12 | 陕西师范大学 | A kind of double stick plane micro-nano metal structure |
| CN110531446A (en) * | 2019-09-05 | 2019-12-03 | 陕西师范大学 | A kind of U-shaped structure and preparation method thereof for realizing circular dichroism |
| CN110595875A (en) * | 2019-10-17 | 2019-12-20 | 陕西师范大学 | Torsion measuring device and system based on surface plasmon |
| CN110907057A (en) * | 2019-12-05 | 2020-03-24 | 西安柯莱特信息科技有限公司 | Sensor with adjustable circular dichroism absorption |
| CN110927070A (en) * | 2019-12-06 | 2020-03-27 | 陕西师范大学 | Structure and device for increasing circular dichroism signals |
| CN114815020A (en) * | 2022-04-21 | 2022-07-29 | 岭南师范学院 | Design method of high-quality-factor refractive index sensor and refractive index sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110907057B (en) * | 2019-12-05 | 2021-08-24 | 杭州翔毅科技有限公司 | Sensor with adjustable circular dichroism absorption |
| CN110927070A (en) * | 2019-12-06 | 2020-03-27 | 陕西师范大学 | Structure and device for increasing circular dichroism signals |
| CN114815020A (en) * | 2022-04-21 | 2022-07-29 | 岭南师范学院 | Design method of high-quality-factor refractive index sensor and refractive index sensor |
| CN114815020B (en) * | 2022-04-21 | 2023-09-22 | 岭南师范学院 | Design method of high-quality-factor refractive index sensor and refractive index sensor |
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