CN110082385B - Micro-nano metal structure for realizing circular dichroism and application thereof - Google Patents

Micro-nano metal structure for realizing circular dichroism and application thereof Download PDF

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CN110082385B
CN110082385B CN201910348991.5A CN201910348991A CN110082385B CN 110082385 B CN110082385 B CN 110082385B CN 201910348991 A CN201910348991 A CN 201910348991A CN 110082385 B CN110082385 B CN 110082385B
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CN110082385A (en
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景志敏
张中月
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Shaanxi Normal University
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    • 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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    • 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

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Abstract

The invention relates to the technical field of micro-nano optics, in particular to a micro-nano metal structure for realizing circular dichroism and application thereof.

Description

Micro-nano metal structure for realizing circular dichroism and application thereof
Technical Field
The invention belongs to the technical field of micro-nano photonics, and particularly relates to a micro-nano metal structure for realizing circular dichroism and application thereof.
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. The chirality of a substance or structure is usually detected by Circular Dichroism (CD), which can be defined as the difference in absorption rate of a chiral medium for different circularly polarized light, and the difference is Circular Dichroism.
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 three-dimensional structure, each layer of the structure does not have chirality generally, but the whole structure has chirality due to rotation angles or relative displacement between layers. The multilayer chiral structure generally has good circular dichroism, but the structure is complex, so that the multilayer chiral structure is generally difficult to prepare in experiments, and the actual production and manufacturing difficulty is higher.
The single layer chiral structure also possesses circular dichroism, and the preparation method is relatively easy compared with double-layer and multi-layer structures. While planar chiral structures are generally complex and circular dichroism is difficult to adjust.
Disclosure of Invention
In order to solve the problems of complex structure of a planar chiral structure and difficulty in adjusting circular dichroism in the prior art, the invention provides a micro-nano metal structure for realizing circular dichroism and a using method thereof. Different circular dichroism signals can be obtained by adjusting the interval g between the double L-shaped structures, so that the aim of dynamically adjusting the circular dichroism signals is fulfilled.
The technical problem to be solved by the invention is realized by the following technical scheme:
a micro-nano metal structure for realizing circular dichroism is formed by connecting a plurality of periodic unit planes with the same structure; each period unit comprises a double-L-shaped structural unit; each structural unit comprises a transverse body I, a transverse body II, a vertical body I and a vertical body II; the transverse body I is vertically connected with the vertical body I; the transverse body II is vertically connected with the vertical body II; the transverse body I and the transverse body II are arranged in parallel; the vertical body I and the vertical body II are arranged in parallel; the transverse body I, the transverse body II, the vertical body I and the vertical body II are all made of a noble metal material Au.
Furthermore, the transverse body I and the transverse body II have the same structure, and the vertical body I and the vertical body II have the same structure; the length of the vertical body I is 4/3 of the length of the transverse body I; the width and the thickness of the horizontal body I, the horizontal body II, the vertical body I and the vertical body II are equal.
Further, the length of the transverse body I and the transverse body II is 150 nm; the lengths of the vertical bodies I and II are 200 nm; the widths of the transverse body I, the transverse body II, the vertical body I and the vertical body II are w equal to 40 nm; the thickness h is 30 nm.
Further, an application of the micro-nano metal structure for realizing circular dichroism comprises the following steps:
step 1, adjusting the distance g between a vertical body I and a vertical body II, measuring and recording different distances g and corresponding CD signals, and enabling the distances g between the vertical bodies I and the vertical bodies II to correspond to the CD signals one by one to obtain a corresponding table;
step 2, at a first temperature T1Then, filling a thermal expansion material between the vertical body I and the vertical body II, starting a light source and a detector, measuring and recording a CD signal of the micro-nano metal structure at the temperature, and determining the distance g between the vertical body I and the vertical body II in the state through the corresponding table obtained in the step 11；
Step 3, keeping other environmental conditions of the step 2 unchanged, and only changing the environmental temperature T1To a second temperature T2The thermal expansion material is deformed, the light source and the detector are started, and the second temperature T is measured and recorded2CD signals of the lower micro-nano metal structure, and the distance g between the vertical body I and the vertical body II in the state is determined through the corresponding table in the step 12；
Step 4, obtaining the distance g through the step 2 and the step 31And g2With the recorded temperature value T1And T2The coefficient of the thermal expansion material is derived.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the micro-nano metal structure for realizing circular dichroism, the circular dichroism of the micro-nano metal structure is dynamically adjusted by adjusting the distance g between the vertical body I and the vertical body II, and the coupling degree between the two L-shaped structures of the micro-nano metal structure is changed by utilizing the size of the distance g between the vertical body I and the vertical body II, so that the dynamic adjustment of the circular dichroism is realized.
2. The micro-nano metal structure for realizing circular dichroism is formed by arranging two simple L-shaped structures at intervals, is simple in structure, easy to prepare, clear in physical mechanism and good in application prospect.
Drawings
FIG. 1 is a schematic diagram of generation of circular dichroism signals of a micro-nano metal structure according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a metal micro-nano structure in embodiment 1 of the present application;
fig. 3 is a schematic perspective view of a metal micro-nano structure in embodiment 1 of the present application;
FIG. 4 is a graph of an absorption spectrum and a circular dichroism spectrum of a metal micro-nano structure in example 1 of the present application;
fig. 5 is a current distribution of a metal micro-nano structure at an absorption peak in example 1 of the present application;
FIG. 6 is a table showing the relationship between the distance g between the upright I and the upright II and the CD signal in example 2 of the present application.
In the figure: 1. a transverse body I; 2. a transverse body II; 3. a vertical body I; 4. and a vertical body II.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
Example 1:
a micro-nano metal structure for realizing circular dichroism is formed by connecting a plurality of periodic unit planes with the same structure, each periodic unit comprises a double-L-shaped structural unit, each structural unit comprises a transverse body I1, a transverse body II 2, a vertical body I3 and a vertical body II 4, the transverse body I1 is vertically connected with the vertical body I3, and the transverse body II 2 is vertically connected with the vertical body II 4; horizontal body I1 and horizontal body II 2 parallel arrangement, erect body I3 and erect II 4 parallel arrangement of body, horizontal body I1, horizontal body II 2, erect body I3, erect body II 4 and make by noble metal material Au.
Specifically, the method comprises the following steps:
the micro-nano metal structure belongs to a planar chiral structure, and when incident light irradiates the micro-nano metal structure, different absorption is generated on left-handed circularly polarized light and right-handed circularly polarized light, so that circular dichroism is generated.
As shown in FIGS. 2 and 3, the horizontal body I1 and the horizontal body II 2 have the same structure, the vertical body I3 and the vertical body II 4 have the same structure, the length of the vertical body I3 is 4/3 of the length of the horizontal body I1, and the widths and the thicknesses of the horizontal body I1, the horizontal body II 2, the vertical body I3 and the vertical body II 4 are all equal.
Specifically, the method comprises the following steps:
the size and the generation principle of the circular dichroism of the chiral micro-nano metal structure of the embodiment are as follows:
the calculation simulation test is carried out by using three-dimensional finite element method FEM calculation software COMSOL Multiphysics, and specific parameters are preferably as follows:
the side length of the period is Px ═ Py ═ 400nm, the lengths of the transverse body I1 and the transverse body II 2 are a ═ 150nm, the lengths of the vertical body I3 and the vertical body II 4 are b ═ 200nm, the widths of the transverse body I1, the transverse body II 2, the vertical body I3 and the vertical body II 4 are w ═ 40nm, the thickness is h ═ 30nm, and the distance g between the vertical body I and the vertical body II is 10 nm.
The micro-nano metal structure is made of a noble metal material, and preferably, the micro-nano metal structure is made of Au.
FIG. 4 shows an absorption spectrum and a circular dichroism spectrum of the chiral micro-nano metal structure according to the embodiment of the present application, wherein A-Denotes the absorption of left-handed circularly polarized light, A+The absorption of right-handed circularly polarized light is shown, and CD shows the magnitude of circular dichroism. From fig. 4 we can clearly see that: the structure shows three absorption peaks at 680nm, 740nm and 1200nm, respectively, where A is 740nm and A is-＝14.9％，A+At 30.2%, a more pronounced difference occurs, thus resulting in a distinct CD valley at this wavelength, λ 740nm, of the size: CD 15.2%.
To further illustrate the principle of circular dichroism generated by the chiral micro-nano metal structure of this embodiment, this embodiment discloses a current distribution at an absorption peak λ of 740nm, as shown in fig. 5:
when the right-handed circularly polarized light is irradiated, 8-type magnetic dipoles are formed by the currents at the gaps between the vertical bodies I3 and II 4 and between the vertical bodies I3 and II 4, and the currents at the gaps between the vertical bodies I3 and II 4 and between the vertical bodies I3 and II 4 are also larger, so that the chiral metal micro-nano structure in the embodiment generates large absorption when the right-handed circularly polarized light is irradiated; under the irradiation of left-handed circularly polarized light, the currents in the gaps between the vertical bodies I3 and II 4 and between the vertical bodies I3 and II 4 form S-shaped magnetic dipoles, but the magnitude of the current is smaller than that under the irradiation of right-handed circularly polarized light, so that the absorption difference between the left-handed circularly polarized light and the right-handed circularly polarized light is caused, and a larger CD signal is generated.
Example 2:
based on the micro-nano metal structure for realizing circular dichroism disclosed in embodiment 1, the embodiment discloses an application of the micro-nano metal structure for realizing circular dichroism, which specifically comprises the following steps:
step 1, adjusting the distance g between a vertical body I3 and a vertical body II 4, measuring and recording different distances g and corresponding CD signals, so that the distances g between the vertical bodies I3 and II 4 correspond to the CD signals one by one, and obtaining a corresponding table as shown in FIG. 6;
step 2, at a first temperature T1Then, filling a thermal expansion material between the vertical body I3 and the vertical body II 4, starting a light source and a detector, measuring and recording a CD signal of the micro-nano metal structure at the temperature, and determining the distance g between the vertical body I3 and the vertical body II 4 in the state through the corresponding table obtained in the step 11；
Step 3, keeping other environmental conditions of the step 2 unchanged, and only changing the environmental temperature T1To a second temperature T2The thermal expansion material is deformed, the light source and the detector are started, and the second temperature T is measured and recorded2CD signals of the lower micro-nano metal structure are obtained, and the distance g between the vertical body I3 and the vertical body II 4 in the state is determined through the corresponding table in the step 1 as shown in figure 62；
Step 4, obtaining the distance g through the step 2 and the step 31And g2With the recorded temperature value T1And T2The coefficient of the thermal expansion material is derived.
Specifically, the method comprises the following steps:
the thermal expansion material changes with the change of the temperature of the environment when no external force is applied. In this embodiment, a thermal expansion material is filled in a gap between the vertical body i 3 and the vertical body ii 4, and a change in the thermal expansion material causes a change in the gap of the chiral micro-nano metal structure, thereby causing a change in the size and position of the chiral micro-nano metal structure CD. Because one temperature can correspond to a CD signal, the change of the temperature can be directly measured by measuring the CD signal of the chiral micro-nano metal structure, and the method is particularly suitable for materials which have small thermal expansion deformation and high detection requirement, particularly materials which are accurate to nano level.
The micro-nano metal structure in the embodiment can realize temperature measurement, is simple and convenient to operate, and provides a new idea for the research of the temperature sensor.
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 (3)

1. A micro-nano metal structure for realizing circular dichroism is characterized in that: the micro-nano metal structure is formed by connecting a plurality of periodic unit planes with the same structure;
each period unit comprises a double-L-shaped structural unit;
each structural unit comprises a transverse body I (1), a transverse body II (2), a vertical body I (3) and a vertical body II (4);
the transverse body I (1) is vertically connected with the vertical body I (3); the transverse body II (2) is vertically connected with the vertical body II (4); the transverse body I (1) and the transverse body II (2) are arranged in parallel; the vertical body I (3) and the vertical body II (4) are arranged in parallel;
the transverse body I (1), the transverse body II (2), the vertical body I (3) and the vertical body II (4) are all made of a noble metal material Au;
the transverse body I (1) and the transverse body II (2) are identical in structure, and the vertical body I (3) and the vertical body II (4) are identical in structure; the length of the vertical body I (3) is 4/3 of the length of the transverse body I (1); the width and the thickness of the transverse body I (1), the transverse body II (2), the vertical body I (3) and the vertical body II (4) are equal.
2. A micro-nano metal structure according to claim 1, wherein: the length of the transverse body I (1) and the transverse body II (2) is 150 nm; the lengths of the vertical bodies I (3) and II (4) are that b is 200 nm; the width w of the horizontal body I (1), the width II (2), the vertical body I (3) and the thickness h of the vertical body II (4) is 40nm, and the thickness h of the horizontal body I (1), the vertical body II (2) and the vertical body II (4) is 30 nm.
3. The application of any micro-nano metal structure according to claims 1-2, wherein the micro-nano metal structure comprises: the method comprises the following steps:
step 1, adjusting the distance g between a vertical body I (3) and a vertical body II (4), measuring and recording different distances g and corresponding CD signals, so that the distances g between the vertical bodies I (3) and the vertical bodies II (4) correspond to the CD signals one by one, and obtaining a corresponding table;
step 2, at a first temperature T1Then, filling a thermal expansion material between the vertical body I (3) and the vertical body II (4), starting a light source and a detector, measuring and recording a CD signal of a micro-nano metal structure at the temperature, and determining the distance g between the vertical body I (3) and the vertical body II (4) in the state through the corresponding table obtained in the step 11；
Step 3, keeping other environmental conditions of the step 2 unchanged, and only changing the environmental temperature T1To a second temperature T2The thermal expansion material is deformed, the light source and the detector are started, and the second temperature T is measured and recorded2CD signals of the lower micro-nano metal structure, and the distance g between the vertical body I (3) and the vertical body II (4) in the state is determined through the corresponding table in the step 12；
Step 4, obtaining the distance g through the step 2 and the step 31And g2With the recorded temperature value T1And T2The coefficient of the thermal expansion material is derived.
CN201910348991.5A 2019-04-28 2019-04-28 Micro-nano metal structure for realizing circular dichroism and application thereof Expired - Fee Related CN110082385B (en)

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CN110441114B (en) * 2019-09-05 2021-12-24 陕西师范大学 Double-rod planar micro-nano metal structure
CN110531446B (en) * 2019-09-05 2021-03-09 陕西师范大学 U-shaped structure for realizing circular dichroism and preparation method thereof
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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
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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CN208752320U (en) * 2018-06-22 2019-04-16 西安科锐盛创新科技有限公司 A kind of chiral metal nano thin-film optical texture
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CN107946182A (en) * 2017-12-08 2018-04-20 陕西师范大学 A kind of micro-nano metal structure for realizing asymmetric transmission and preparation method thereof
CN108107684A (en) * 2017-12-27 2018-06-01 陕西师范大学 It is a kind of regulate and control circular dichroism it is double-layer nanostructured and preparation method thereof
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