CN109991168B - Planar micro-nano structure capable of generating circular dichroism - Google Patents
Planar micro-nano structure capable of generating circular dichroism Download PDFInfo
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- CN109991168B CN109991168B CN201910366713.2A CN201910366713A CN109991168B CN 109991168 B CN109991168 B CN 109991168B CN 201910366713 A CN201910366713 A CN 201910366713A CN 109991168 B CN109991168 B CN 109991168B
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Abstract
The invention relates to the technical field of micro-nano optics, in particular to a planar micro-nano structure capable of generating circular dichroism, which comprises a unit structure; each unit structure comprises a rectangular strip and a U-shaped structure, and the rectangular strip and the U-shaped structure are positioned in the same plane; the U-shaped structure comprises a first arm, a second arm and a connecting strip; the first arm is parallel to the second arm; the first arm and the second arm are respectively connected to two ends of the connecting strip; the rectangular strip is positioned on one side of the U-shaped structure and is parallel to the first arm; the rectangular strips and the U-shaped structures are both made of precious metal materials. The rectangular strip is arranged on one side of the U-shaped structure, the charge distribution on the surface of the U-shaped structure is adjusted through the coupling effect between the rectangular strip and the U-shaped structure, different absorption is generated on the left-handed polarized light and the right-handed polarized light, so that an electric dipole and a magnetic dipole are generated, a specific circular current mode is formed, and a large circular dichroism signal is formed.
Description
Technical Field
The invention relates to the technical field of micro-nano optics, in particular to a planar micro-nano structure capable of generating circular dichroism.
Background
The term chirality is derived from greek, and represents the symmetry of a structure, and has important significance in various disciplines. If an object is different from its mirror image, it is called "chiral" and its mirror image is not coincident with the original object, as if the left and right hands were mirror images of each other and could not be superimposed. Chirality is a fundamental feature of life processes, and most of organic molecules constituting a living body are chiral molecules.
According to the disclosed technology, Circular Dichroism (CD) is an important means for studying chiral compounds, and the positive and negative of the Cotton Effect at a specific wavelength have the same Effect as the left and right rotation of the optical rotation spectrum on the macroscopic identification of chiral enantiomers, and the absolute configuration of the chiral enantiomers can be determined by some rules.
Naturally occurring chiral structures, circular dichroism, are weaker and are not conducive to wider applications. The metal nanostructure has stronger circular dichroism due to the stronger interaction of the metal with light. It is common for experimenters to design some metal nanostructures to combine with naturally chiral molecules to enhance the chirality of naturally chiral molecules.
Generally, circular dichroism of a three-dimensional structure is relatively strong, but preparation is complex, and common experimental conditions cannot be realized. The planar micro-nano structure is easy to prepare, but circular dichroism is generally weak.
Disclosure of Invention
Aiming at the problems, the invention aims to solve the technical problem that the circular dichroism of the planar micro-nano structure is weak.
Therefore, the invention provides a planar micro-nano structure capable of generating circular dichroism, which comprises a unit structure; each unit structure comprises a rectangular strip and a U-shaped structure, and the rectangular strip and the U-shaped structure are positioned in the same plane; the U-shaped structure comprises a first arm, a second arm and a connecting strip; the first arm is parallel to the second arm; the first arm and the second arm are respectively connected to two ends of the connecting strip; the rectangular strip is positioned on one side of the U-shaped structure and is parallel to the first arm; the rectangular strips and the U-shaped structures are both made of precious metal materials.
Further, the first arm and the second arm are rectangular.
Further, the connecting strip is arc-shaped or rectangular.
Further, the first arm, the second arm and the rectangular bar are not equal in height.
Further, the rectangular strip is connected with the connecting strip; the rectangular bar is in the same direction as the first arm and the second arm.
Furthermore, the planar micro-nano structure is formed by arranging and combining the unit structures according to a rectangular period.
The invention has the beneficial effects that: the embodiment of the application provides a planar micro-nano structure capable of generating circular dichroism, a rectangular strip is arranged on one side of a U-shaped structure, the charge distribution on the surface of the U-shaped structure is adjusted through the coupling effect between the rectangular strip and the U-shaped structure, different absorption is generated on left-handed polarized light and right-handed polarized light, an electric dipole and a magnetic dipole are generated, a specific circulating current mode is formed, and a large circular dichroism signal is formed.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of a planar micro-nano structure unit in this embodiment 1;
FIG. 2 is a charge distribution diagram of the planar micro-nano structure in the embodiment 1;
FIG. 3 is an absorption spectrum of the planar micro-nano structure in the embodiment 1;
FIG. 4 is a planar micro-nano structure circular dichroism spectrum of the embodiment 1;
fig. 5 is a schematic structural diagram of a planar micro-nano structure unit in this embodiment 2;
FIG. 6 is a charge distribution diagram of the planar micro-nano structure in the embodiment 2;
FIG. 7 is an absorption spectrum of the planar micro-nano structure in the embodiment 2;
FIG. 8 is a planar micro-nano structure circular dichroism spectrum of the embodiment 2;
fig. 9 is a schematic structural diagram of a planar micro-nano structure unit in this embodiment 3;
FIG. 10 is a charge distribution diagram of the planar micro-nano structure of the present example 3;
fig. 11 is an absorption spectrum of the planar micro-nano structure in the embodiment 3;
fig. 12 is a planar micro-nano structure circular dichroism spectrum of the embodiment 3.
In the figure: 1. a U-shaped structure; 11. a first arm; 12. a second arm; 13. a connecting strip; 2. a rectangular strip.
Detailed Description
The embodiment of the application provides a planar micro-nano structure capable of generating circular dichroism, wherein a rectangular strip is arranged on one side of a U-shaped structure, and the charge distribution on the surface of the U-shaped structure is adjusted through the coupling effect between the rectangular strip and the U-shaped structure, so that different absorptions are generated for left-handed polarized light and right-handed polarized light, an electric dipole and a magnetic dipole are generated, a specific circulating current mode is formed, and a large circular dichroism signal is formed.
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:
for solving the problem of weak circular dichroism of the planar micro-nano structure in the prior art, the embodiment provides a planar micro-nano structure capable of generating circular dichroism, which includes a unit structure, as shown in fig. 1, the unit structure includes a rectangular bar 2 and a U-shaped structure 1, the rectangular bar 2 and the U-shaped structure 1 are located in the same plane, the U-shaped structure 1 includes a first arm 11, a second arm 12 and a connecting bar 13, the first arm 11 is parallel to the second arm 12, the first arm 11 and the second arm 12 are respectively connected to two ends of the connecting bar 13, the rectangular bar 2 is located on one side of the U-shaped structure 1 and is parallel to the first arm 11, and the rectangular bar 2 and the U-shaped structure 1 are both made of noble metal materials. The rectangular strip 2 is connected with the connecting strip 13, the directions of the rectangular strip 2 and the first arm 11 and the second arm 12 are the same, and the planar micro-nano structure is formed by unit structures which are arranged and combined according to a rectangular period.
Specifically, the method comprises the following steps:
the first arm 11 and the second arm 12 are rectangular, and the connecting bar 13 is arc-shaped or rectangular, and the embodiment is preferably rectangular. By arranging a rectangular strip 2 on one side of the U-shaped structure 1 and by means of the coupling effect between the rectangular strip 2 and the U-shaped structure 1, the charge distribution on the surface of the U-shaped structure 1 is adjusted, different absorption is generated on left-handed polarized light and right-handed polarized light, so that an electric dipole and a magnetic dipole are generated, a specific circular current mode is formed, and a large circular dichroism signal is formed.
In particular, the rectangular bar 2 of the present embodiment has the same height and the same width as the first arm 11 and the second arm 12 of the U-shaped structure 1, and as shown in fig. 2, is a charge distribution diagram of the planar micro-nano structure of the present embodiment, and the rectangular bar 2 is coupled with the U-shaped structure 1 with the introduction of the rectangular bar 2, so that the charge distribution of the original U-shaped structure 1 is changed, and different circulation modes are formed. Fig. 3 to 4 are an absorption spectrum and a circular dichroism spectrum of the planar micro-nano structure of the embodiment.
As shown in fig. 2-4, in the λ 780nm band, the planar micro-nano structure of this embodiment forms a counterclockwise circulating current mode between the surface charge and the rectangular bar 2 along the length direction of the first arm 11 of the U-shaped structure 1 under the irradiation of left-handed polarized Light (LCP), and the electric field intensity is very weak; under the irradiation of right-handed polarized light (RCP), a clockwise circulation mode is formed between the first arm 11 of the U-shaped structure 1 and the rectangular strip 2 along the length direction, and the electric field intensity is strong. As shown in fig. 3 and 4, when λ is 780nm, a — 0.44359, a + ═ 0.17506, and CD 0.26853, strong circular dichroism occurs.
When the λ is a 1220nm waveband, the planar micro-nano structure of the embodiment is irradiated by left-handed polarized light, a counterclockwise circular current mode is formed between the surface charges and the rectangular strip 2 along the length direction of the first arm 11 of the U-shaped structure 1, and the electric field intensity is weak; under the irradiation of right-handed polarized light, a counterclockwise circulating current mode is formed between the first arm 11 of the U-shaped structure 1 and the rectangular strip 2 along the length direction, and the electric field intensity is strong. As shown in fig. 3 and 4, when λ is 1220nm, a ═ 0.11147, a + ═ 0.17275, and CD ═ 0.06128, strong circular dichroism occurs.
When the λ is 1780nm, in the planar micro-nano structure of the present embodiment, under left-handed polarized light irradiation, a clockwise circulation mode is formed between the surface charges and the rectangular bar 2 along the length direction of the first arm 11 of the U-shaped structure 1, and the electric field intensity is strong; under the irradiation of right-handed polarized light, a clockwise circulating mode is formed between the first arm 11 of the U-shaped structure 1 and the rectangular strip 2 along the length direction, and the electric field intensity is strong. As shown in fig. 3 and 4, when λ is 1780nm, a — 0.2283, a + ═ 0.22468, and CD 0.00362, strong circular dichroism occurs.
Example 2:
based on the planar micro-nano structure capable of generating circular dichroism disclosed in embodiment 1, the heights of the first arm 11, the second arm 12 and the rectangular bar 2 are different, and other structures and physical parameters are the same. As shown in fig. 5, the rectangular bar 2 is at the same height as the first arm 11, but the bottom of the rectangular bar 2 is below the level of the connecting bar 13. The charge distribution diagram, the absorption spectrum diagram and the circular dichroism spectrogram are shown in FIGS. 6-8.
When the λ is 740nm, in the planar micro-nano structure of this embodiment, under left-handed polarized light irradiation, two circulating current modes in different counterclockwise and clockwise directions are formed between the surface charges and the rectangular bar 2 along the length direction of the first arm 11 of the U-shaped structure 1, and the electric field intensity is weak; under the irradiation of right-handed polarized light, two circulation modes in different directions of anticlockwise and clockwise are formed between the length direction of the first arm 11 of the U-shaped structure 1 and the rectangular strip 2, and the electric field intensity is strong. As shown in fig. 7 and 8, when λ is 740nm, a ═ 0.25926, a ═ 0.20349, and CD ═ 0.05577, strong circular dichroism occurs.
In a λ 880nm band, the planar micro-nano structure of this embodiment is not coupled between the U-shaped structure 1 and the rectangular bar 2 under left-handed polarized light irradiation, and the respective electric field strengths are also weak; under the irradiation of right-handed polarized light, a counterclockwise circulation mode is formed between the first arm 11 of the U-shaped structure 1 and the rectangular strip 2 along the length direction, and the electric field intensity is strong. As shown in fig. 7 and 8, when λ is 880nm, a ═ 0.10501, a ═ 0.41725, and CD ═ 0.31224, strong circular dichroism occurs.
When the λ is 1360nm, in the planar micro-nano structure of the embodiment, under left-handed polarized light irradiation, a counterclockwise circular current mode is formed between the surface charge and the rectangular bar 2 along the length direction of the first arm 11 of the U-shaped structure 1, and the electric field intensity is strong; under the irradiation of right-handed polarized light, a clockwise circulating mode is formed between the first arm 11 of the U-shaped structure 1 and the rectangular strip 2 along the length direction, and the electric field intensity is weak. In this example, the absorption of left-handed polarized light and right-handed polarized light is different in the planar micro-nano structure, and as shown in fig. 7 and 8, when λ is 1360nm, a — 0.35428, a +: 0.17391, and CD is 0.18037, strong circular dichroism occurs.
Example 3:
based on the planar micro-nano structure capable of generating circular dichroism disclosed in embodiment 2, the heights of the first arm 11, the second arm 12 and the rectangular bar 2 are different. This example differs from example 2 in that: as shown in fig. 9, the rectangular bar 2 is at the same height as the first arm 11, but the bottom of the rectangular bar 2 is above the level of the connecting bar 13. The charge distribution diagram, the absorption spectrum diagram and the circular dichroism spectrogram are shown in figures 10-12.
When λ is 720nm, in the planar micro-nano structure of this embodiment, under left-handed polarized light irradiation, a counterclockwise circular current mode is formed between the surface charge and the rectangular bar 2 along the length of the first arm 11 of the U-shaped structure 1, and the electric field strength is weak; under the irradiation of right-handed polarized light, a clockwise circulating current mode is formed between the length of the first arm 11 of the U-shaped structure 1 and the rectangular strip 2, and the electric field intensity is strong. As shown in fig. 11 and 12, when λ is 720nm, a ═ 0.3282, a ═ 0.23617, and CD ═ 0.09203, strong circular dichroism occurs.
When the λ is 820nm, in the planar micro-nano structure of this embodiment, under left-handed polarized light irradiation, a counterclockwise circular current mode is formed between the surface charge and the rectangular bar 2 along the length direction of the first arm 11 of the U-shaped structure 1, and the electric field strength is strong; under the irradiation of right-handed polarized light, no coupling exists between the first arm 11 of the U-shaped structure 1 and the rectangular strip 2 along the length direction, the electric field intensity is weak, and the absorption difference of the left-handed polarized light and the right-handed polarized light is large. As shown in fig. 11 and 12, when λ is 820nm, a ═ 0.17256, a + ═ 0.33099, and CD ═ 0.15843, strong circular dichroism occurs.
In a lambda-1760 nm waveband, surface charges of the planar micro-nano structure of the embodiment form a clockwise circulation mode with the rectangular strip 2 along the length direction of the first arm 11 of the U-shaped structure 1 under the irradiation of left-handed polarized light, so that the electric field intensity is strong; under the irradiation of right-handed polarized light, a clockwise circulating mode is formed between the first arm 11 of the U-shaped structure 1 and the rectangular strip 2 along the length direction, and the electric field intensity is weak. As shown in fig. 11 and 12, when λ is 1760nm, a ═ 0.2304, a ═ 0.22297, and CD ═ 0.00743, strong circular dichroism occurs.
The embodiment of the application provides a planar micro-nano structure capable of generating circular dichroism, wherein a rectangular strip 2 is arranged on one side of a U-shaped structure 1, the charge distribution on the surface of the U-shaped structure 1 is adjusted through the coupling effect between the rectangular strip 2 and the U-shaped structure 1, and different absorption is generated on left-handed polarized light and right-handed polarized light, so that an electric dipole and a magnetic dipole are generated, a specific circulating current mode is formed, and a large circular dichroism signal is formed. In addition, the coupling mode between the U-shaped structure 1 and the CD signal generator can be adjusted through the height of the rectangular strips 2 beside the U-shaped structure 1, CD signals under different circulation modes are generated, and the CD signal generator has strong popularization and application values.
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 (1)
1. A plane micro-nano structure capable of generating circular dichroism is characterized by comprising a unit structure;
each unit structure comprises a rectangular strip and a U-shaped structure, and the rectangular strip and the U-shaped structure are positioned in the same plane;
the U-shaped structure comprises a first arm, a second arm and a connecting strip; the first arm is parallel to the second arm; the lower end of the first arm and the lower end of the second arm are respectively and vertically connected to two ends of the connecting strip; the upper end of the first arm is flush with the upper end of the rectangular strip, and the lower end of the rectangular strip is lower than or higher than the connecting strip;
the connecting strip is arc-shaped or rectangular;
the rectangular strip is positioned on one side of the U-shaped structure and is parallel to the first arm;
the rectangular strips and the U-shaped structures are both made of precious metal materials;
the first arm and the second arm are equal in height, and are rectangular;
the planar micro-nano structure is formed by arranging and combining the unit structures according to a rectangular period.
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