CN113835140A - Heterogeneous metal mesh metamaterial structure for realizing circular dichroism - Google Patents
Heterogeneous metal mesh metamaterial structure for realizing circular dichroism Download PDFInfo
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- CN113835140A CN113835140A CN202110280162.5A CN202110280162A CN113835140A CN 113835140 A CN113835140 A CN 113835140A CN 202110280162 A CN202110280162 A CN 202110280162A CN 113835140 A CN113835140 A CN 113835140A
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- circular dichroism
- metal
- metal mesh
- metamaterial structure
- heterogeneous
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 56
- 239000002184 metal Substances 0.000 title claims abstract description 56
- 238000002983 circular dichroism Methods 0.000 title claims abstract description 37
- 239000000758 substrate Substances 0.000 claims abstract description 11
- 239000002073 nanorod Substances 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 5
- 230000001154 acute effect Effects 0.000 claims description 2
- 150000002739 metals Chemical class 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 abstract description 5
- 230000000737 periodic effect Effects 0.000 abstract description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000002086 nanomaterial Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001142 circular dichroism spectrum Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000000411 transmission spectrum Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/002—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of materials engineered to provide properties not available in nature, e.g. metamaterials
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
Abstract
The invention relates to the technical field of micro-nano optics, in particular to a heterogeneous metal mesh metamaterial structure for realizing circular dichroism, which comprises a substrate 1 and a metal layer 2 positioned on the substrate 1. The metal layer comprises a metal grating 3 and a metal grating 4, the metal grating 3 and the metal grating 4 are intersected with each other but not perpendicular to each other, and the metal grating 4 is intercepted by the metal grating 3 to form a periodic nanorod array. The heterogeneous metal mesh metamaterial structure for realizing circular dichroism can generate absorbed circular dichroism signals, the maximum value can reach 40%, and the circular dichroism can be dynamically adjusted by adjusting the grating period and the duty ratio; in addition, the heterogeneous metal mesh metamaterial structure for realizing circular dichroism is simple in preparation method, low in preparation cost and good in application prospect.
Description
Technical Field
The invention relates to the technical field of micro-nano optics, in particular to a heterogeneous metal mesh metamaterial structure for realizing circular dichroism.
Background
Chiral refers to the property of not being completely coincident with a mirror image by itself, where a chiral species and its mirror image are referred to interchangeably as the chiral counterparts. Many substances in nature have chirality in their structure, such as proteins, DNA, etc. The chirality is of great importance to life, so that the detection of chirality of substances becomes a hot spot for research of numerous researchers. Circular Dichroism (CD), which can be defined as the difference in absorption rate of a chiral medium for different circularly polarized light, is generally used to detect the chirality of a substance or structure.
Since chiral signals such as biomolecules are weak and generally located in a near ultraviolet band, which is inconvenient to detect, it is very important to further understand the chiral nature and the nature of circular dichroism by studying the nature of the chiral structure of the artificial metal.
The traditional metal chiral structure for realizing circular dichroism mostly adopts a multilayer structure, the multilayer chiral structure generally has good circular dichroism, but the structure is complex, so that the preparation is generally difficult in an experiment, and the difficulty in actual production and manufacturing is higher. Compared to multilayer structures, single-layer chiral structures are easier to prepare, but some optical structures provided in the prior art consist of a single medium, a complex single-layer structure needs to be designed to achieve the chiral effect, which greatly increases the difficulty of manufacturing the optical structures, and circular dichroism is generally weak.
Disclosure of Invention
In view of the above problems, the present invention is directed to a technical problem of how to design a micro-nano structure capable of realizing strong circular dichroism.
Therefore, the invention provides a heterogeneous metal mesh metamaterial structure for realizing circular dichroism, which comprises a substrate, wherein a metal structure layer is arranged on the substrate; the metal structure layer comprises two groups of metal gratings, the two groups of metal gratings are mutually intersected but not mutually perpendicular, and one group of metal gratings is cut off by the other group of metal gratings to form a periodic nanorod array.
Furthermore, the two groups of metal gratings are respectively composed of two different metals.
Further, the thicknesses of the two groups of gratings of the heterogeneous metal mesh metamaterial structure can be different from each other.
Further, the two metal grating periods T1 and T2 may be different, and the respective metal line widths w1 and w2 may also be different.
Furthermore, the included angle of the two groups of metal grating periods is an acute angle.
Further, the substrate may be made of different materials.
Compared with the prior art, the invention has the beneficial effects that:
1. the optical structure for enhancing circular dichroism of circularly polarized light provided by the invention has good circular dichroism, can improve the circular dichroism to about 40%, enables the circular dichroism to be more prominent, lays a foundation for the application of the circular dichroism, and can dynamically adjust the circular dichroism by setting different periods, metal wire widths and included angles;
2. the optical structure for enhancing circular dichroism of circularly polarized light has the advantages of simple preparation method and low preparation cost, and has good application prospect when being used as a detection component of a high-sensitivity biological chiral structure.
The present invention will be described in further detail with reference to the accompanying drawings
Drawings
FIG. 1 is a schematic plan view of a heterogeneous metal mesh metamaterial structure according to the present invention; .
FIG. 2 is an absorption spectrum of the heterogeneous metal mesh metamaterial structure of example 1;
FIG. 3 is a circular dichroism plot of the heterogeneous metal mesh metamaterial structure of example 1;
Detailed Description
The method aims to solve the problems that in the prior art, a three-dimensional metal micro-nano structure is difficult to prepare and a two-dimensional metal micro-nano structure CD signal is generally weak. The heterogeneous metal mesh metamaterial structure for realizing circular dichroism can generate absorbed circular dichroism signals, and the maximum value can reach 40%. To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined purpose, the following detailed description, structural features and effects of the present invention are provided with reference to the accompanying drawings and examples, but the present invention is not limited thereto.
Example 1 was carried out:
the embodiment provides a heterogeneous metal mesh metamaterial structure shown in fig. 1, which includes a substrate 1, wherein the substrate 1 mainly plays a manufacturing role, the substrate 1 is made of silicon dioxide, a gold grating 2 and a silver grating 3 which are arranged on the substrate 1 are intersected with each other but not perpendicular to each other, and the silver grating 3 is cut by the gold grating 2 to form a silver nanorod array;
furthermore, the periods and the metal line widths of the gold gratings and the silver gratings are respectively 400nm and 140nm, and the included angle between the gratings is 65 degrees. The thickness of the metal layer is 50 nm.
To further illustrate the circular dichroism characteristics of the heterogeneous metal mesh metamaterial in example 1, the example discloses a transmission spectrum and a circular dichroism spectrum under the irradiation of left-handed and right-handed circular polarized light, as shown in fig. 2 and 3. Circular dichroism of the structure can reach 40% at most.
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 (7)
1. A heterogeneous metal mesh metamaterial structure for realizing circular dichroism is characterized in that the metal mesh structure is arranged on a substrate and is formed by mutually intersecting two groups of metal gratings with different materials.
2. The heterogeneous metal mesh metamaterial structure for realizing circular dichroism of claim 1, wherein the two sets of metal grating materials are respectively two different metals.
3. The heterogeneous metal mesh metamaterial structure implementing circular dichroism as claimed in claim 2, wherein the two sets of metal gratings of different materials intersect each other but are not perpendicular to each other, wherein one set of gratings is truncated by the other set of gratings to form a nanorod array.
4. A heterogeneous metal mesh metamaterial structure capable of realizing circular dichroism as claimed in claim 1, wherein the thicknesses of the two sets of gratings in the heterogeneous metal mesh metamaterial structure can take different values.
5. A heterogeneous metal mesh metamaterial structure for realizing circular dichroism as claimed in claim 1, wherein the two sets of metal gratings have different periods and different metal line widths.
6. The heterogeneous metal mesh metamaterial structure for realizing circular dichroism, according to claim 1, wherein the two sets of metal gratings are inclined at an acute angle to each other.
7. The heterogeneous metal mesh metamaterial structure capable of achieving circular dichroism of claim 1, wherein the substrate can be made of different materials to adjust circular dichroism.
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| CN202110280162.5A CN113835140B (en) | 2021-03-16 | 2021-03-16 | Heterogeneous metal mesh metamaterial structure for realizing circular dichroism |
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| CN202110280162.5A CN113835140B (en) | 2021-03-16 | 2021-03-16 | Heterogeneous metal mesh metamaterial structure for realizing circular dichroism |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114325884A (en) * | 2022-01-04 | 2022-04-12 | 西安邮电大学 | Cantilever-shaped circular dichroism micro-nano structure and preparation method thereof |
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| CN103606628A (en) * | 2013-11-22 | 2014-02-26 | 哈尔滨工业大学深圳研究生院 | Novel thin-film solar cell by means of metamaterials |
| CN106019451A (en) * | 2016-07-17 | 2016-10-12 | 苏州大学 | Full-stokes vector polarizer based on surface plasmon and preparation method thereof |
| CN106058477A (en) * | 2016-05-11 | 2016-10-26 | 哈尔滨工业大学深圳研究生院 | Microwave band dual-layer metal wire structural chirality super surface |
| JP2018138985A (en) * | 2017-02-24 | 2018-09-06 | 京セラ株式会社 | Optical element |
| CN108761850A (en) * | 2018-08-14 | 2018-11-06 | 中山科立特光电科技有限公司 | A kind of adjustable optical texture of circular dichroism and its adjusting method |
| CN110320586A (en) * | 2019-07-12 | 2019-10-11 | 西安柯莱特信息科技有限公司 | A kind of circular dichroism structure based on inclination nanometer rods |
| US20200264101A1 (en) * | 2017-09-21 | 2020-08-20 | Board Of Regents, The University Of Texas System | Nanostructured plasmonic materials and methods of making and use thereof |
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2021
- 2021-03-16 CN CN202110280162.5A patent/CN113835140B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103606628A (en) * | 2013-11-22 | 2014-02-26 | 哈尔滨工业大学深圳研究生院 | Novel thin-film solar cell by means of metamaterials |
| CN106058477A (en) * | 2016-05-11 | 2016-10-26 | 哈尔滨工业大学深圳研究生院 | Microwave band dual-layer metal wire structural chirality super surface |
| CN106019451A (en) * | 2016-07-17 | 2016-10-12 | 苏州大学 | Full-stokes vector polarizer based on surface plasmon and preparation method thereof |
| JP2018138985A (en) * | 2017-02-24 | 2018-09-06 | 京セラ株式会社 | Optical element |
| US20200264101A1 (en) * | 2017-09-21 | 2020-08-20 | Board Of Regents, The University Of Texas System | Nanostructured plasmonic materials and methods of making and use thereof |
| CN108761850A (en) * | 2018-08-14 | 2018-11-06 | 中山科立特光电科技有限公司 | A kind of adjustable optical texture of circular dichroism and its adjusting method |
| CN110320586A (en) * | 2019-07-12 | 2019-10-11 | 西安柯莱特信息科技有限公司 | A kind of circular dichroism structure based on inclination nanometer rods |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114325884A (en) * | 2022-01-04 | 2022-04-12 | 西安邮电大学 | Cantilever-shaped circular dichroism micro-nano structure and preparation method thereof |
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