CN109597159B - Micro-nano structure capable of generating circular dichroism - Google Patents
Micro-nano structure capable of generating circular dichroism Download PDFInfo
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- G01N21/19—Dichroism
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Abstract
The invention relates to the technical field of micro-nano optics, in particular to a micro-nano structure capable of generating circular dichroism, which is formed by mutually connecting a plurality of unit structures according to a rectangular periodic array, wherein each unit structure comprises a rectangular hollow metal ring and a metal strip, one end of the metal strip is connected to the rectangular corner of the hollow metal ring or the non-midpoint position of the short side of the hollow metal ring, and the plane where the metal strip and the hollow metal ring are located has a characteristic included angle alpha. Under the excitation of incident light, a circular current mode is formed at the joint of the metal strip and the hollow metal ring, and a magnetic dipole and an electric dipole in a fixed mode are formed on the hollow metal ring and the metal strip, so that great dissipation is generated during the irradiation of left-handed polarized light, and small dissipation is generated during the irradiation of right-handed polarized light, so that great difference is generated between electric fields excited by the left-handed polarized light and the right-handed polarized light, and strong circular dichroism is generated.
Description
Technical Field
The invention relates to the technical field of micro-nano optics, in particular to a micro-nano structure capable of generating circular dichroism.
Background
Circular Dichroism (CD) refers to the phenomenon of different absorption degrees of two circularly polarized lights, namely right-handed polarized light (hereinafter abbreviated as RCP) and left-handed polarized light (hereinafter abbreviated as LCP), and the difference of the absorption degrees is called circular dichroism in relation to wavelength, and is a spectroscopic method for determining molecular asymmetric structure, mainly used for determining the three-dimensional structure of protein in the field of molecular biology, and also used for determining the three-dimensional structures of nucleic acid and polysaccharide.
However, circular dichroism of common natural molecules is very weak, and the requirement on a detection instrument is very high, and at this time, a micro-nano metal structure needs to be artificially manufactured to enhance the circular dichroism of the natural molecules so as to reduce the experimental detection difficulty, so that the design of the micro-nano structure capable of generating the circular dichroism is necessary.
Disclosure of Invention
In view of the above problems, an object of the embodiments of the present application is to design a micro-nano structure that can generate circular dichroism.
Therefore, the embodiment of the application provides a micro-nano structure capable of generating circular dichroism, wherein the micro-nano structure is formed by connecting a plurality of unit structures according to a rectangular periodic array; each unit structure comprises a rectangular hollow metal ring and a metal strip; one end of the metal strip is connected to the rectangular corner of the hollow metal ring or the non-midpoint position of the short side of the hollow metal ring, and the other end of the metal strip is separated from the hollow metal ring; the metal strip and the plane of the hollow metal ring form a characteristic included angle alpha; the characteristic included angle alpha is not equal to 0 degrees, 90 degrees or 180 degrees.
Furthermore, a connecting block for connecting and supporting is arranged at the connecting position of the metal strip and the hollow metal ring.
Further, the hollow metal ring is internally filled with silicon dioxide.
Further, the metal strip is a rectangular strip or an L-shaped strip.
Further, the metal strip and the hollow metal ring are both made of a noble metal material.
Furthermore, the number of the metal strips is not less than two, and the metal strips are respectively connected to the opposite sides of the hollow metal ring.
The invention has the beneficial effects that: according to the micro-nano structure, under the excitation of incident light, strong circular dichroism is generated by interaction of the incident light and the micro-nano structure, under the excitation of the incident light, a circular current mode is formed at the joint of the metal strip and the hollow metal ring, and a magnetic dipole and an electric dipole in a fixed mode are formed on the hollow metal ring and the metal strip, so that when left-handed polarized light irradiates, current dissipation is mainly concentrated on the whole metal strip to generate large dissipation, when right-handed polarized light irradiates, the dissipation is mainly distributed at the connecting part of the metal strip and the hollow metal ring, strong current is also distributed at the lower half part of the metal strip, electric fields excited by the left-handed polarized light and the right-handed polarized light generate large difference, and therefore strong circular dichroism is generated.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a micro-nano structure in embodiment 1 of the present application;
FIG. 2 is a current distribution diagram of a micro-nano structure in example 1 of the present application;
FIG. 3 is an absorption spectrum of a micro-nano structure in example 1 of the present application;
FIG. 4 is a CD spectrum of a micro-nano structure in example 1 of the present application;
FIG. 5 is a schematic diagram of a micro-nano structure in embodiment 2 of the present application;
FIG. 6 is a current distribution diagram of a micro-nano structure in example 2 of the present application;
FIG. 7 is an absorption spectrum of a micro-nano structure in example 2 of the present application;
FIG. 8 is a CD spectrum of a micro-nano structure in example 2 of the present application;
FIG. 9 is a schematic diagram of a micro-nano structure in embodiment 3 of the present application;
FIG. 10 is a current distribution diagram of a micro-nano structure in example 3 of the present application;
FIG. 11 is an absorption spectrum of a micro-nano structure in example 3 of the present application;
fig. 12 is a CD spectrum of a micro-nano structure in example 3 of the present application.
In the figure: 1. a hollow metal ring; 2. a metal strip.
Detailed Description
The micro-nano structure is formed by a plurality of unit structures which are connected with each other according to a rectangular periodic array, each unit structure comprises a rectangular hollow metal ring and a metal strip, one end of each metal strip is connected to the non-midpoint position of the rectangular corner or the short side of each hollow metal ring, and the other end of each metal strip is separated from each hollow metal ring. According to the micro-nano structure, under the excitation of incident light, strong circular dichroism can be generated due to interaction of the incident light and the micro-nano structure, under the excitation of the incident light, a circular current mode is formed at the joint of the metal strip and the hollow metal ring, a magnetic dipole and an electric dipole in a fixed mode are formed on the hollow metal ring and the metal strip, when the left-handed polarized light irradiates, current dissipation is mainly concentrated on the whole metal strip, and large dissipation is generated.
To further explain the technical means and effects of the present invention adopted to achieve the intended purpose, the following detailed description of the embodiments, structural features and effects of the present invention will be made with reference to the accompanying drawings and examples.
Example 1:
the embodiment discloses a micro-nano structure capable of generating circular dichroism, wherein the micro-nano structure is formed by connecting a plurality of unit structures according to a rectangular periodic array, for example, each unit structure shown in fig. 1 comprises a rectangular hollow metal ring 1 and a metal strip 2, one end of the metal strip 2 is connected to a rectangular corner of the hollow metal ring 1 or a non-midpoint position of a short side of the hollow metal ring, and the other end is separated from the hollow metal ring 1; the metal strip 2 and the plane of the hollow metal ring 1 have a characteristic included angle alpha, and the characteristic included angle alpha is not equal to 0 degree, 90 degrees or 180 degrees; the hollow metal ring 1 is a rectangular ring; the metal strip is a rectangular strip or an L-shaped strip; the metal strip 2 and the hollow metal ring 1 are both made of noble metal materials.
Specifically, the method comprises the following steps:
the inner ring of the hollow metal ring 1 can be in any shape, and the metal strip 2 can be connected to any position of the hollow metal ring 1, which is not the symmetry axis of the metal rectangular ring 1. The inner ring of the hollow metal ring 1 is preferably a rectangular ring, the metal strip 2 is preferably a rectangular strip, the characteristic included angle alpha is preferably 60 degrees, the metal strip 2 is arranged close to one rectangular edge of the hollow metal ring 1, and the noble metal material is preferably gold.
In the micro-nano structure of the embodiment, through the combination of the hollow metal ring 1 and the metal strip 2, under the excitation of incident light, free electrons on the metal surface of the micro-nano structure of the embodiment of the invention generate violent oscillation to generate a specific circulation mode, and current is guided to the free end of the metal strip 2 from the hollow metal ring 1 through the metal strip 2, so that the current on the metal strip 2 flows from inside to outside when the left-handed polarized light irradiates, meanwhile, a vertical magnetic dipole and a horizontal electric dipole are formed on the hollow metal ring 1 of the micro-nano structure of the embodiment of the invention, and the relative included angle between the magnetic dipole and the electric dipole changes the electric field distribution of the micro-nano structure of the embodiment, so that the micro-nano structure of the embodiment generates different responses to the left-handed polarized light and the right-handed polarized. When the left-handed polarized light is irradiated, the current dissipation is concentrated on the whole metal strip 2, and the excitation energy of the left-handed polarized light generates great dissipation, namely great light absorption is obtained; when the right-handed polarized light shines, strong electric current mainly distributes in the latter half of metal strip 2, and the dissipation is also mainly concentrated in the coupling part of hollow metal ring 1 with metal strip 2, and the area is less, produces very little absorption to right-handed polarized incident light promptly, and the absorption of this embodiment micro-nano structure to levogyration polarized light and right-handed polarized light is different to make levogyration polarized light and right-handed polarized light arouse electric field strength produce very big difference, thereby produce strong circular dichroism. To further illustrate the circular dichroism characteristics of the micro-nano structure of this embodiment, this embodiment further discloses a current distribution diagram of the micro-nano structure of this embodiment.
Fig. 2 shows the current distribution of the micro-nano structure of this example, where fig. 2(a) is a current distribution diagram of the micro-nano structure of this example irradiated with left-handed polarized light in a mode of 1560nm wavelength λ, and fig. 2(b) is a current distribution diagram of the micro-nano structure of this example irradiated with right-handed polarized light in a mode of 1560nm wavelength λ.
Specifically, the method comprises the following steps:
at 1560nm, the dissipation is mainly distributed on the tilted metal strip 2, for LCP, the dissipation on the whole metal strip 2 is very strong, and the current is mainly distributed on the whole metal strip 2; for RCP, the dissipation is mainly distributed at the junction of the metal strip 2 and the hollow metal ring 1, and the strong current is also distributed at the junction of the hollow metal ring 1 and the metal strip 2. The individually tilted metal strip 2 enables the micro-nano structure in the embodiment of the application to be three-dimensional, and the current is guided to flow to the top end of the metal strip 2, and as can be seen from fig. 6, the current flows from the hollow metal ring 1 to the free end of the metal strip 2, an obvious CD mode is generated at 1560nm, which reaches 30%, and the metal strip has strong circular dichroism.
As shown in fig. 3, an absorption spectrum of the micro-nano structure of this embodiment is shown, where a + represents an absorption rate of the micro-nano structure of this embodiment for right-handed polarized light, and a-represents an absorption rate of the micro-nano structure of this embodiment for left-handed polarized light. Fig. 4 is a circular dichroism spectrum of the micro-nano structure of the embodiment, and it can be clearly seen from fig. 3 and 4 that a strong CD mode can be generated in the wavelength band of 0 to 2200 nm: wavelength λ 1560nm, a ═ 47.49%, a + ═ 17.44%, and CD ═ 30.05%.
The joint of the metal strip 2 and the hollow metal ring 1 is provided with a connecting block for connection and support, a characteristic included angle alpha is formed between the metal strip 2 and the hollow metal ring 1 in the preparation process, the included angle is easy to deform under the influence of the outside, and the connecting block can be used for fixing and supporting the metal strip 2. In addition, in the preparation process, the characteristic included angle alpha can be stably controlled through the thickness of the connecting block, and the preparation difficulty is reduced.
In addition, silicon dioxide can be filled in the hollow metal ring, the effect of forming a characteristic included angle α between the fixed metal strip 2 and the hollow metal ring 1 can also be achieved, and meanwhile, the optical properties of the micro-nano structure of the embodiment cannot be affected.
As shown in fig. 3, the micro-nano structure of the present embodiment has a contrast (a) with respect to absorption of LCP and RCP--A+)/(A-+A+) = 47.49% -17.44%/(47.49% + 17.44%) -46.74%. Therefore, the micro-nano structure of the embodiment has large contrast ratio of LCP and RCP signals, large absorption rate difference, high resolution, high recognizability and strong anti-noise capability.
The strong electric field of the micro-nano structure is mainly concentrated on the metal strip 2, and the metal strip 2 is easy to be heated and fused due to the existence of the strong electric field. The micro-nano structure of the embodiment is formed by connecting a plurality of unit structures, the hollow metal ring 1 is made of a noble metal material, the metal heat dissipation coefficient is high, and heat generated by the metal strip 2 is easily conducted out, so that the integrity of the micro-nano structure of the embodiment is protected, and the service life of the structure is prolonged.
Example 2:
based on the micro-nano structure disclosed in embodiment 1, this embodiment further discloses a micro-nano structure capable of generating circular dichroism, which is different from embodiment 1 in that, as shown in fig. 5, a slit is provided between the metal strip 2 and the rectangular hollow metal ring 1.
Specifically, the method comprises the following steps: the metal strip 2 is connected with one side of the hollow metal ring 1 and is separated from other three sides. When the left-handed polarized light irradiates the micro-nano structure of the embodiment, the flowing current on the metal strip 2 is enhanced by the slit between the metal strip 2 and the rectangular hollow metal ring 1, a circulating current is formed at the joint of the metal strip 2 and the hollow metal ring 1, and the micro-nano structure of the embodiment absorbs the left-handed polarized light greatly due to the coupling between the metal strip 2 and the hollow metal ring 1, so that the circular dichroism of the micro-nano structure of the embodiment is enhanced.
Fig. 6 shows the current distribution of the micro-nano structure of this embodiment, where fig. 6(a) is a current distribution graph of the micro-nano structure of this embodiment irradiated by the left-handed polarized light in the mode with the wavelength λ being 920nm, and fig. 6(b) is a current distribution graph of the micro-nano structure of this embodiment irradiated by the right-handed polarized light in the mode with the wavelength λ being 920 nm; fig. 6(c) is a current distribution diagram of the micro-nano structure of the present example irradiated with left-handed polarized light in a 1820nm mode, and fig. 6(d) is a current distribution diagram of the micro-nano structure of the present example irradiated with right-handed polarized light in a 1820nm mode. As is clear from fig. 6(a) - (d), the dissipation is mainly distributed on the tilted metal strip 2, and for LCP, the dissipation is strong on the whole metal strip 2, and the current is mainly distributed on the whole metal strip 2; for RCP, the dissipation is mainly distributed at the junction of the metal strip 2 and the hollow metal ring 1, and the strong current is also distributed at the junction of the hollow metal ring 1 and the metal strip 2. The individually tilted metal strips 2 enable the micro-nano structure in the embodiment of the present application to be three-dimensional, so as to play a role in guiding current, it can be seen from fig. 6 that all the current flows from the hollow metal ring 1 to the top ends of the metal strips 2, a circular current is formed at the connection between the metal strips 2 and the hollow metal ring 1, and the micro-nano structure in the embodiment absorbs the left-handed polarized light greatly due to the coupling of the circular current and the current, so that circular dichroism of the micro-nano structure in the embodiment of the present application is enhanced. Two distinct CD modes are generated in the 920nm and 1820nm bands, up to 33.79%, with strong circular dichroism.
As shown in fig. 7, an absorption spectrum of the micro-nano structure of this embodiment is shown, where a + represents an absorption rate of the micro-nano structure of this embodiment for right-handed polarized light, and a-represents an absorption rate of the micro-nano structure of this embodiment for left-handed polarized light. Fig. 8 is a circular dichroism spectrum of the micro-nano structure of the embodiment, and it can be clearly seen from fig. 7 and 8 that two strong CD modes can be generated in the wavelength band of 0 to 2200 nm: wavelength lambda is 920nm, A is 45.19%, A + is 11.39%, and CD is 33.79%; the wavelength λ is 1820nm, a ═ 32.16%, a + ═ 24.04%, and CD ═ 8.13%.
Example 3:
based on the micro-nano structure disclosed by the embodiment, the embodiment further discloses a micro-nano structure capable of generating circular dichroism, which is different from the embodiment 1 in that at least two metal strips 2 are respectively connected to two opposite sides of the hollow metal ring 1, as shown in fig. 9, the number of the metal strips 2 in the embodiment is preferably 2, and the metal strips are respectively arranged on the two opposite sides of the rectangular ring.
Fig. 10 shows an electric field distribution diagram of the micro-nano structure of this embodiment, where fig. 10(a) is a current distribution diagram of the micro-nano structure of this embodiment when left-handed light with a wavelength λ of 820nm mode is irradiated, fig. 10(b) is a current distribution diagram of the micro-nano structure of this embodiment when right-handed light with a wavelength λ of 820nm mode is irradiated, fig. 10(c) is a current distribution diagram of the micro-nano structure of this embodiment when left-handed light with a wavelength λ of 1980nm mode is irradiated, and fig. 10(d) is a current distribution diagram of the micro-nano structure of this embodiment when right-handed light with a wavelength λ of 1980 nm. As can be clearly seen from the figure, the current on the hollow metal ring 1 is very weak and does not form a circular current, the current on the metal strip 2 flows to the top end of the metal strip 2, but the circular current is formed at the connecting position between the hollow metal ring 1 and the metal strip 2, which is equivalent to forming a magnetic dipole, the direction of the magnetic dipole is vertical to the plane of the hollow metal ring 1, the metal strip 2 is a vertical rectangular strip, the current direction uniformly flows to the free end of the metal strip 2, which is equivalent to an electric dipole, and a relative included angle is formed between the formed electric dipole and the magnetic dipole in space, so that a strong circular dichroism signal is formed.
As shown in fig. 11, an absorption spectrum of the micro-nano structure of this embodiment is shown, where a + represents an absorption rate of the micro-nano structure of this embodiment for right-handed polarized light, and a-represents an absorption rate of the micro-nano structure of this embodiment for left-handed polarized light. Fig. 12 is a circular dichroism spectrum of the micro-nano structure of the embodiment, and it can be clearly seen from fig. 11 and 12 that two strong CD modes can be generated in the wavelength band of 0 to 2200 nm: wavelength lambda is 820nm, a-is 34.32%, a + is 16.59%, and CD is 17.74%; the wavelength λ is 1980nm, a-39.40%, a + 30.45%, and CD 8.95%.
In addition, the electric field is mainly concentrated on the metal strip 2 to generate electric field local enhancement, and the electric field local enhancement can be used for enhancement of Raman scattering and can also be used for fixed-point targeted catalysis in catalytic reaction.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (5)
1. A micro-nano structure capable of generating circular dichroism is characterized in that the micro-nano structure is formed by connecting a plurality of unit structures according to a rectangular periodic array; each unit structure comprises a rectangular hollow metal ring and a metal strip;
one end of the metal strip is connected to the rectangular corner of the hollow metal ring or the non-midpoint position of the short side of the hollow metal ring, and the other end of the metal strip is separated from the hollow metal ring; the metal strip and the plane of the hollow metal ring form a characteristic included angle alpha; the characteristic included angle alpha is not equal to 0 degrees, 90 degrees or 180 degrees.
2. A micro-nano structure according to claim 1, wherein a connecting block for connection and support is provided at the connection between the metal strip and the hollow metal ring.
3. A micro-nano structure according to claim 1, wherein the hollow metal rings are internally filled with silica.
4. A micro-nano structure according to claim 1, wherein the metal strips are rectangular strips or "L" shaped strips.
5. A micro-nano structure according to claim 1, wherein the metal strips and the hollow metal rings are made of a noble metal material.
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