CN109597159A - A kind of micro-nano structure can produce circular dichroism - Google Patents
A kind of micro-nano structure can produce circular dichroism Download PDFInfo
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- G02B5/00—Optical elements other than lenses
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- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
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- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/19—Dichroism
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Abstract
The present invention relates to micronano optical technical fields, more particularly to a kind of micro-nano structure that can produce circular dichroism, micro-nano structure is made of multiple cellular constructions according to the interconnection of rectangular Periodic array, each cellular construction includes a rectangle hollow becket and a metal strip, metal strip one end is connected to hollow metal ring rectangular corners or the non-midpoint of hollow metal ring short side, and the plane where metal strip and hollow metal ring has a feature angle α.Under the excitation of incident light, metal strip and hollow metal ring junction form circulation patterns, fixed mode magnetic dipole and electric dipole are formed on hollow metal ring and metal strip, so that generating very big dissipation when left-hand polarization light irradiates, right-handed polarized light dissipates small when irradiating, so that the electric field that left-hand polarization light and right-handed polarized light are excited generates very big difference, to generate strong circular dichroism.
Description
Technical field
The present invention relates to micronano optical technical fields, and in particular to a kind of micro-nano structure that can produce circular dichroism.
Background technique
Circular dichroism (circular dichroism, CD) refer to right-handed polarized light (hereinafter referred to as RCP) and it is left-handed partially
Shake the different phenomenon of light (hereinafter referred to as LCP) two kinds of circularly polarized light degree of absorption, the difference of this degree of absorption and the pass of wavelength
System claims circular dichroism spectra, is the spectroscopic methodology of a molecular species determination dissymmetrical structure, is mainly used for measuring the stereochemical structure of protein,
It is mainly used for measuring the stereochemical structure of protein in molecular biology field, it is also possible to measure the three-dimensional knot of nucleic acid and polysaccharide
Structure.
But the circular dichroism of general natural molecule is all especially weak, very high to detecting instrument requirement, at this time just needs artificial
Some micro-nano metal structures are manufactured to enhance the circular dichroism of natural molecule to reduce experiment detection difficulty, so designing one kind can
To generate the micro-nano structure of circular dichroism with regard to necessary.
Summary of the invention
In view of the above-mentioned problems, the purpose of the embodiment of the present application is to design a kind of micro-nano structure that can produce circular dichroism.
For this purpose, the embodiment of the present application provides a kind of micro-nano structure that can produce circular dichroism, the micro-nano structure by
Multiple cellular constructions are interconnected according to rectangular Periodic array and are constituted；Each cellular construction includes a rectangle hollow becket
With a metal strip；Described metal strip one end is connected to hollow metal ring rectangular corners or the non-midpoint of hollow metal ring short side,
The other end and hollow metal ring mutually from；Plane where the metal strip and the hollow metal ring has a feature angle α；Institute
Feature angle α is stated not equal to 0 °, 90 ° or 180 °.
Further, the metal strip and hollow metal ring junction are equipped with a connection for connecting and supporting
Block.
Further, silica is filled in the hollow metal ring.
Further, the metal strip is rectangular strip or L shape item.
Further, the metal strip is made with the hollow metal ring of precious metal material.
Further, the metal strip is no less than two, is connected to the hollow metal ring opposite side.
Beneficial effects of the present invention: the embodiment of the present application micro-nano structure is under the excitation of incident light, incident light and the application
The interaction of embodiment micro-nano structure generates strong circular dichroism, and under the excitation of incident light, metal strip and hollow metal ring connect
The place of connecing forms circulation patterns, and fixed mode magnetic dipole and electric dipole are formed on hollow metal ring and metal strip, so that
When left-hand polarization light irradiates, current dissipation is concentrated mainly on entire metal strip, generates very big dissipation, right-handed polarized light irradiation
When dissipate and be mainly distributed on the coupling part of metal strip Yu hollow metal ring, strong electric current is also distributed about the lower half of metal strip
Point, so that the electric field that left-hand polarization light and right-handed polarized light are excited generates very big difference, to generate strong circular dichroism.
The present invention is described in further details below with reference to attached drawing.
Detailed description of the invention
Fig. 1 is 1 micro-nano structure schematic diagram of the embodiment of the present application；
Fig. 2 is the current distributing figure of 1 micro-nano structure of the embodiment of the present application；
Fig. 3 is the abosrption spectrogram of 1 micro-nano structure of the embodiment of the present application；
Fig. 4 is the CD spectrogram of 1 micro-nano structure of the embodiment of the present application；
Fig. 5 is 2 micro-nano structure schematic diagram of the embodiment of the present application；
Fig. 6 is the current distributing figure of 2 micro-nano structure of the embodiment of the present application；
Fig. 7 is the abosrption spectrogram of 2 micro-nano structure of the embodiment of the present application；
Fig. 8 is the CD spectrogram of 2 micro-nano structure of the embodiment of the present application；
Fig. 9 is 3 micro-nano structure schematic diagram of the embodiment of the present application；
Figure 10 is the current distributing figure of 3 micro-nano structure of the embodiment of the present application；
Figure 11 is the abosrption spectrogram of 3 micro-nano structure of the embodiment of the present application；
Figure 12 is the CD spectrogram of 3 micro-nano structure of the embodiment of the present application.
In figure: 1, hollow metal ring；2, metal strip.
Specific embodiment
The embodiment of the present application micro-nano structure is made of multiple cellular constructions according to the interconnection of rectangular Periodic array, Mei Gedan
Meta structure include a rectangle hollow becket and a metal strip, described metal strip one end be connected to hollow metal ring rectangular corners or
The non-midpoint of hollow metal ring short side, the other end and hollow metal ring mutually from.The embodiment of the present application micro-nano structure is in incident light
Excitation under, incident light and the embodiment of the present application micro-nano structure interaction can produce strong circular dichroism, in incident light
Under excitation, metal strip and hollow metal ring junction form circulation patterns, form stent on hollow metal ring and metal strip
The magnetic dipole and electric dipole of formula, when left-hand polarization light irradiates, current dissipation is concentrated mainly on entire metal strip, is generated very
Big dissipation dissipates when right-handed polarized light irradiates and is mainly distributed on the part that metal strip is connect with hollow metal ring, strong electric current
It is also distributed about the lower half portion of metal strip, so that the electric field that left-hand polarization light and right-handed polarized light are excited generates very big difference
It is different, to generate strong circular dichroism.
Reach the technical means and efficacy that predetermined purpose is taken for the present invention is further explained, below in conjunction with attached drawing and reality
Example is applied to a specific embodiment of the invention, structure feature and its effect, detailed description are as follows.
Embodiment 1:
Present embodiment discloses a kind of micro-nano structure that can produce circular dichroism, micro-nano structure is pressed by multiple cellular constructions
It interconnects and constitutes according to rectangular Periodic array, if each cellular construction of Fig. 1 includes a rectangle hollow becket 1 and a metal strip 2,
Described 2 one end of metal strip is connected to 1 rectangular corners of hollow metal ring or the non-midpoint of hollow metal ring short side, the other end and sky
1 phase of heart becket from；Plane where metal strip 2 and hollow metal ring 1 has a feature angle α, and feature angle α is not equal to
0 °, 90 ° or 180 °；Hollow metal ring 1 is straight-flanked ring；Metal strip is rectangular strip or L shape item；Metal strip 2 and hollow metal
Ring 1 is made of precious metal material.
Specifically:
1 inner ring of hollow metal ring can be any shape, and the metal strip 2 can connect in the hollow metal ring
1 it is any be 1 symmetry axis of metal rectangular ring position.1 inner ring of the present embodiment hollow metal ring is preferably straight-flanked ring, gold
Belonging to item 2 is preferably rectangular strip, and feature angle α is preferably 60 °, and metal strip 2 and a rectangular edges of hollow metal ring 1 are closely set
It sets, precious metal material is preferably gold.
The present embodiment micro-nano structure passes through the combination of hollow metal ring 1 and metal strip 2, under the excitation of incident light, this Shen
Please the free electron of embodiment micro-nano structure metal surface generate violent oscillation, generate specific circulation patterns, pass through metal
Item 2 guides electric current to the free end of metal strip 2 from hollow metal ring 1, so that electricity when left-hand polarization light irradiates on metal strip 2
Stream flows from inside to outside, while the magnetic dipole of vertical direction is formed on the embodiment of the present application micro-nano structure hollow metal ring 1,
With the electric dipole of horizontal direction, the relative angle between magnetic dipole and electric dipole changes the electricity of the present embodiment micro-nano structure
Field distribution, so that the present embodiment micro-nano structure generates left-hand polarization light and right-handed polarized light different responses.Left-handed inclined
When the light that shakes irradiates, current dissipation is concentrated on entire metal strip 2, generates very big consumption for the excitation energy of left-hand polarization light
It dissipates to get big light absorption is arrived；When right-handed polarized light irradiates, strong electric current is mainly distributed on the lower half portion of metal strip 2, dissipates
Also it is just concentrated mainly on the coupling part of hollow metal ring 1 Yu metal strip 2, area is smaller, i.e., generates to dextropolarization incident light
The absorption of very little, the present embodiment micro-nano structure are different for the absorption of left-hand polarization light with right-handed polarized light, so that left-handed
The electric field strength that polarised light and right-handed polarized light are excited generates very big difference, to generate strong circular dichroism.For into one
Step illustrates the circular dichroism characteristic of the present embodiment micro-nano structure, and the present embodiment further discloses the electric current of the present embodiment micro-nano structure
Distribution map.
The present embodiment micro-nano structure current distribution is as shown in Fig. 2, Fig. 2 (a) is the left-hand polarization of wavelength X=1560nm mode
Light irradiates the current distributing figure of the present embodiment micro-nano structure, and Fig. 2 (b) is the irradiation of wavelength X=1560nm mode right-handed polarized light
The current distributing figure of the present embodiment micro-nano structure.
Specifically:
At 1560nm, dissipation is mainly distributed on the metal strip 2 of tilting, the dissipation for LCP, on entire metal strip 2
All very strong, electric current is mainly all distributed on entire metal strip 2；For RCP, dissipation is mainly distributed on metal strip 2 and hollow metal
1 junction of ring, strong electric current are also distributed about the junction of hollow metal ring 1 Yu metal strip 2.The metal strip 2 individually tilted makes
The embodiment of the present application micro-nano structure three dimensional stress guides the top of current direction metal strip 2, and electric current is all as can see from Figure 6
It is flowed to from hollow metal ring 1 toward the free end of metal strip 2, generates an apparent CD mode in 1560nm, reach
30%, there is very strong circular dichroism.
As shown in the abosrption spectrogram of Fig. 3 the present embodiment micro-nano structure, wherein A+ indicate the present embodiment micro-nano structure for
The absorptivity of right-handed polarized light, A- indicate the present embodiment micro-nano structure for the absorptivity of left-hand polarization light.Fig. 4 is the present embodiment
The circular dichroism figure of micro-nano structure, can be clearly seen that from Fig. 3 and Fig. 4, can produce one in 0~2200nm wave band
A very strong CD mode: wavelength X=1560nm, A-=47.49%, A+=17.44%, CD=30.05%.
The metal strip 2 is equipped with a link block for connecting and supporting with 1 junction of hollow metal ring, is preparing
There is a feature angle α in the process, which is easy to be influenced and deformed by the external world, utilize between metal strip 2 and hollow metal ring 1
Link block can make fixed function, be used to support metal strip 2.Also, during the preparation process, can by the thickness of link block come
Stable control this feature angle α reduces preparation difficulty.
In addition it is also possible to be filled with silica in the hollow metal ring, fixed metal strip 2 equally also can achieve
Have the function of a feature angle α between hollow metal ring 1, meanwhile, it can't be to the optical of the present embodiment micro-nano structure
Matter has an impact.
In addition, as shown in figure 3, this implementation micro-nano structure for the absorption of LCP and RCP contrast=(A--A+)/(A-+
A+)=(47.49%-17.44%)/(47.49%+17.44%)=46.74%.It can be seen that the present embodiment micro-nano structure pair
Big in the contrast of LCP and RCP signal, absorptivity difference is big, high resolution, can identification it is high, anti-noise ability is strong.
The strong electrical field of the present embodiment micro-nano structure is concentrated mainly on metal strip 2, and is originally embodied as micro-nano structure, metal strip
2 due to strong electrical field presence, it is easy to heated fusing.And the present embodiment micro-nano structure is connected with each other structure by multiple cellular constructions
At hollow metal ring 1 is made of precious metal material, and heat dissipation metal coefficient is high, it is easy to the thermal conductivity that metal strip 2 generates is gone out, from
And the integrality of the present embodiment micro-nano structure is protected, extending structure service life.
Embodiment 2:
Based on micro-nano structure disclosed in embodiment 1, the present embodiment, which further discloses one kind, can produce circular dichroism
Micro-nano structure, unlike the first embodiment, as shown in figure 5, between metal strip 2 and rectangular-shaped hollow metal ring 1 have one
Slit.
Specifically: metal strip 2 is connect with a line of hollow metal ring 1, with other three sides mutually from.Work as left-hand polarization
When light irradiates the present embodiment micro-nano structure, on the slit enhancing metal strip 2 between the hollow metal ring 1 of metal strip 2 and rectangle
Streaming current, and circulation is formed in metal strip 2 and 1 junction of hollow metal ring, coupling between the two is so that the present embodiment
Micro-nano structure is very big for its absorption of left-hand polarization light, to enhance the circular dichroism of the present embodiment micro-nano structure.
The present embodiment micro-nano structure current distribution is as shown in fig. 6, Fig. 6 (a) is the left-hand polarization of wavelength X=920nm mode
Light irradiates the current distributing figure of the present embodiment micro-nano structure, and Fig. 6 (b) is that wavelength X=920nm mode right-handed polarized light irradiates this
The current distributing figure of embodiment micro-nano structure；Fig. 6 (c) is that wavelength X=1820nm mode left-hand polarization light irradiates the present embodiment
The current distributing figure of micro-nano structure, Fig. 6 (d) are that wavelength X=1820nm mode right-handed polarized light irradiates the present embodiment micro-nano knot
The current distributing figure of structure.We can be clearly seen that from Fig. 6 (a)-(d), dissipates and is mainly distributed on the metal strip 2 of tilting
On, for LCP, the dissipation on entire metal strip 2 is all very strong, and electric current is mainly all distributed on entire metal strip 2；For RCP, consumption
It dissipates and is mainly distributed on metal strip 2 and 1 junction of hollow metal ring, strong electric current is also distributed about hollow metal ring 1 and metal strip 2
Junction.The metal strip 2 individually tilted makes the embodiment of the present application micro-nano structure three dimensional stress, plays the role of guiding electric current,
Electric current is entirely and flows to from hollow metal ring 1 toward the top of metal strip 2 as can see from Figure 6, in metal strip 2 and sky
1 junction of heart becket forms circulation, the coupling of circulation and electric current so that the present embodiment micro-nano structure for left-hand polarization light
Its absorption is very big, to enhance the circular dichroism of the present embodiment micro-nano structure.Two are generated obviously in 920nm and 1820nm wave band
CD mode, maximum can achieve 33.79%, have very strong circular dichroism.
As shown in the abosrption spectrogram of Fig. 7 the present embodiment micro-nano structure, wherein A+ indicate the present embodiment micro-nano structure for
The absorptivity of right-handed polarized light, A- indicate the present embodiment micro-nano structure for the absorptivity of left-hand polarization light.Fig. 8 is the present embodiment
The circular dichroism figure of micro-nano structure, can be clearly seen that from Fig. 7 and Fig. 8, can produce two in 0~2200nm wave band
A very strong CD mode: wavelength X=920nm, A-=45.19%, A+=11.39%, CD=33.79%；Wavelength X=
1820nm, A-=32.16%, A+=24.04%, CD=8.13%.
Embodiment 3:
Based on micro-nano structure disclosed in embodiment, the present embodiment, which further discloses, a kind of can produce the micro- of circular dichroism
Micro-nano structure, unlike the first embodiment, metal strip 2 are no less than two, are connected to two opposite side of hollow metal ring 1, such as
Shown in Fig. 9, the present embodiment metal strip 2 is preferably 2, is respectively arranged on two opposite side of straight-flanked ring.
The present embodiment micro-nano structure distribution map of the electric field is as shown in Figure 10, and Figure 10 (a) is that wavelength X=820nm mode is left-handed
Light irradiates the current distributing figure of the present embodiment micro-nano structure, and Figure 10 (b) is that this reality is irradiated in the right-handed rotation of wavelength X=820nm mode
The current distributing figure of a micro-nano structure is applied, Figure 10 (c) is that wavelength X=1980nm mode left-handed rotation irradiates the present embodiment micro-nano knot
The current distributing figure of structure, Figure 10 (d) are the electric currents point that the present embodiment micro-nano structure is irradiated in the right-handed rotation of wavelength X=1980nm mode
Butut.We can be clearly seen that from figure, and the electric current on hollow metal ring 1 is very weak, and not formed circulation, on metal strip 2
2 top of current direction metal strip, but be connected between hollow metal ring 1 and metal strip 2 place formed circulation, be equivalent to shape
At a magnetic dipole, vertically hollow 1 place plane of becket, metal strip 2 are vertical rectangular strip in direction, and current direction unanimously flows
To the free end of metal strip 2, it is equivalent to an electric dipole, is spatially had between the electric dipole and magnetic dipole of formation
One relative angle, so form stronger circular dichroism signal.
As shown in the abosrption spectrogram of Figure 11 the present embodiment micro-nano structure, wherein A+ indicates the present embodiment micro-nano structure pair
In the absorptivity of right-handed polarized light, A- indicates the present embodiment micro-nano structure for the absorptivity of left-hand polarization light.Figure 12 is this reality
The circular dichroism figure for applying a micro-nano structure, can be clearly seen that from Figure 11 and Figure 12,0~2200nm wave band can be with
Generate two very strong CD modes: wavelength X=820nm, A-=34.32%, A+=16.59%, CD=17.74%；Wavelength X=
1980nm, A-=39.40%, A+=30.45%, CD=8.95%.
In addition, electric field is concentrated mainly on metal strip 2, the enhancing of electric field local is generated, can be used for the enhancing of Raman scattering,
It can also be used for the fixed point targeting catalysis in catalysis reaction.
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 (6)
1. a kind of micro-nano structure that can produce circular dichroism, which is characterized in that the micro-nano structure is pressed by multiple cellular constructions
It interconnects and constitutes according to rectangular Periodic array；Each cellular construction includes a rectangle hollow becket and a metal strip；
Described metal strip one end is connected to hollow metal ring rectangular corners or the non-midpoint of hollow metal ring short side, the other end with
Hollow metal ring mutually from；Plane where the metal strip and the hollow metal ring has a feature angle α；The feature folder
Angle α is not equal to 0 °, 90 ° or 180 °.
2. micro-nano structure according to claim 1, which is characterized in that the metal strip and hollow metal ring junction
Link block equipped with one for connecting and supporting.
3. micro-nano structure according to claim 1, which is characterized in that be filled with silica in the hollow metal ring.
4. micro-nano structure according to claim 1, which is characterized in that the metal strip is rectangular strip or L shape item.
5. micro-nano structure according to claim 1, which is characterized in that the metal strip is with the hollow metal ring by expensive
Metal material is made.
6. micro-nano structure according to claim 1, which is characterized in that the metal strip is no less than two, is connected to
The hollow metal ring opposite side.
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| CN109597159B (en) | 2021-04-06 |
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