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A planar metal nano-chiral structure, preparation method and at effect regulation method

A metal nanostructure and metal nanotechnology, applied in nonlinear optics, instruments, optics, etc., can solve the problems of complex structure, low preparation efficiency, weak signal of single-layer structure, etc., and achieve the effect of enhancing asymmetric transmission signals.

Active Publication Date: 2020-09-22
SHAANXI NORMAL UNIV
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Problems solved by technology

[0007] In order to solve the problems existing in the prior art that realize the asymmetric transmission effect of circularly polarized light and linearly polarized light, the single-layer structure has weak signal, complex structure, and low preparation efficiency. The present invention provides an efficient direct-incidence asymmetric transmission The planar metal nano-chiral structure and its preparation method and AT effect regulation method have the advantages of simple structure, high preparation process efficiency, and can produce high-efficiency direct incident asymmetric transmission, and the signal is easy to detect

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  • A planar metal nano-chiral structure, preparation method and at effect regulation method
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  • A planar metal nano-chiral structure, preparation method and at effect regulation method

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Embodiment 1

[0047] Such as figure 1 As shown, in order to solve the existing technical problems of realizing the asymmetric transmission effect of circularly polarized light, such as complex structure, weak effect, and low preparation efficiency, this embodiment provides a planar metal nano-chiral structure that realizes high-efficiency direct-incident asymmetric transmission , a chiral structure composed of a plurality of nano-units with the same structure up-down and left-right; the metal nano-unit includes a metal nanorod 1 and a coplanar S-shaped metal nanostructure 2 next to the metal nanorod 1 . S-shaped metal nanostructures are designed with chiral features. The metal nanorod 1 is a cuboid, and the S-shaped metal nanostructure 2 is an integrated structure formed by connecting the first arc structure 21 and the second arc structure 22 end to end. The first arc structure 21 and the second arc structure 22 are The diameters are different, and the opening direction is opposite, the di...

Embodiment 2

[0069] The invention also includes a method for regulating the AT effect of the planar metal nano-chiral structure. This example is based on the parameters and steps of Example 1. After preparing the planar metal nanochiral structure of the present invention to achieve high-efficiency direct-incident asymmetric transmission, the following structural parameter changes are performed to regulate the AT signal and spectrum.

[0070] Such as Image 6 As shown, the parameter to set the structure of the metal nanorod width w = 40nm with a thickness of 50 nm; the width of the S-shaped metal nanostructure w = 40nm, and the thickness is 50 nm; the outer diameters of the two semicircular rings of the S-shaped metal nanostructure are r =60 nm and R = 100 nm; the metal nanorod 1 The spacing in the x-direction from the tail end of the S-shaped metal nanostructure 2 is defined as g =60nm; the central angles of the first arcuate structure 21 and the second arcuate structure 22 are bo...

Embodiment 3

[0074] The difference from the above-mentioned embodiment 2 is that this embodiment only changes the distance between the metal nanorods and the S-shaped metal nanostructures g The value of , other parameters take fixed values ​​within the range of each parameter: the width of metal nanorods w = 40nm, length l = 160 nm with a thickness of 50 nm; the width of the S-shaped metal nanostructure w = 40nm, and the thickness is 50 nm; the outer diameters of the two semicircular rings of the S-shaped metal nanostructure are r = 60 nm and R = 100 nm; the central angles of the first arc-body structure 21 and the second arc-body structure 22 are both 180°. Transforming the distance between the metal nanorods and the tail end of the S of the S-shaped metal nanostructure 2 in the x direction is defined as g parameter range, g The values ​​are respectively 20 nm, 40 nm, 60 nm, 80 nm, and 100 nm. When preparing the structure of this embodiment, use a pattern generator to set the str...

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Abstract

The invention relates to a planar metal nanometer chiral structure and a preparation method and an AT effect regulation and control method thereof. The structure is a chiral structure formed by combining multiple nano units with the same structure in an up-down and left-right manner. Each nano unit comprises a metal nanorod and an S-shaped metal nanometer structure arranged at one side of the metal nanorod. The S-shaped metal nanometer structure has a chiral feature. The metal nanorod is a cuboid, and the width and thickness of the metal nanorod are same with the width and thickness of the S-shaped metal nanometer structure. A gap is arranged between the metal nanorod and the S-shaped metal nanometer structure. The metal nanorod and the S-shaped metal nanometer structure adopt the gold material. The structure is formed by two simple structures, that is, the metal nanorods and the S-shaped metal nanometer structures, and can realize efficient straight-incidence asymmetric transmission under vertical irradiation of circularly polarized light; and besides, by adjusting the structure parameters, adjustment of predictable asymmetric transmission band spectrum is realized, and regulationand control of the strength and peak band of an AT signal is realized.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave polarization regulation, and specifically relates to a planar metal nano-chiral structure for realizing high-efficiency direct-incident asymmetric transmission, a preparation method thereof, and an AT effect regulation method. Background technique [0002] Asymmetric transmission (Asymmetric Transmission, AT) means that the incident electromagnetic waves show different transmission properties when they are incident from both sides of the transmission medium, and its transmission properties include transmission, absorption, reflection, polarization conversion, etc. In this paper, the transmission of circularly polarized light with different polarization states is used to describe the asymmetric transmission signal, which is expressed by the formula . Subscript "+" ("-") represents right (left) rotation; subscript "-+" ("+-") represents right (left) circularly polarized light incident...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/00G02F1/01
CPCG02B5/008G02F1/0136
Inventor 张中月张永元王菲赵文静
Owner SHAANXI NORMAL UNIV
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