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Chiral optical element, chiral optical encryption assembly and chiral element design method

A technology of optical components and design methods, applied in optical components, optics, instruments, etc., can solve the problems of limited adjustable range of response intensity and inability to adjust the depth of chiral optics, etc., and achieve high controllability

Active Publication Date: 2020-06-23
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the operating wavelength and response intensity of the chiral optical response in the artificial microstructure can be adjusted in a limited range, and it is impossible to achieve deep regulation of the chiral optical response response band and intensity through limited changes in the structural parameters of the microstructure.

Method used

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  • Chiral optical element, chiral optical encryption assembly and chiral element design method
  • Chiral optical element, chiral optical encryption assembly and chiral element design method
  • Chiral optical element, chiral optical encryption assembly and chiral element design method

Examples

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Embodiment approach 1

[0034] like figure 1 As shown, the chiral optical element provided by the embodiment of the present invention includes: a substrate 100 and a metal microstructure 200 connected to the substrate 100; the metal microstructure 200 includes: a first arc portion 210, a second arc portion 220 and In the extension part 230, the central angle corresponding to the first arc part 210 and the central angle corresponding to the second arc part 220 are opposite to each other; the extension part 230 is connected between the first arc part 210 and the second arc part 220 and extend along the edge of any central angle of the first arc portion 210 and the second arc portion 220 .

[0035] Specifically, the outer diameter of the first arc portion 210 and the second arc portion 220 is 230 nm, the inner diameter of the first arc portion 210 and the second arc portion 220 is 160 nm, and the thickness of the metal microstructure 200 is 70 nm. By changing the arc lengths of the first arc portion 21...

Embodiment approach 2

[0039] like figure 2 As shown, on the basis of Embodiment 1, the metal microstructure 200 further includes a third arc portion 240, the third arc portion 240 is connected to the end of the extension portion 230, and the extension direction of the third arc portion 240 is the same as The extending direction of the first arc portion 210 is opposite.

[0040] Specifically, the outer diameter of the third arc portion 240 is 230 nm, the inner diameter of the third arc portion 240 is 160 nm, and the first arc portion 210 and the third arc portion 240 together form a continuous arc portion. By changing the arc length of the third arc portion 240, the intensity of the chiral optical response at the working wavelength can be controlled.

[0041] Further, the central angle of the third arc portion 240 is 15°˜45°.

[0042] Specifically, when the central angle corresponding to the third arc portion 240 changes continuously from 15° to 45°, and when the central angle of the first arc po...

Embodiment approach 3

[0046] like figure 1 , figure 2 , image 3 , Figure 4 and Figure 5 As shown, the chiral optical encryption component provided by the embodiment of the present invention includes: a first optical element, and a third optical element and / or a fourth optical element. The first optical element includes the chiral optical element provided in Embodiment 1; the third optical element is mirror-symmetrical to the fourth optical element, and both the third optical element and the fourth optical element include the chiral optical element provided in Embodiment 2.

[0047] Specifically, the optical function of the first optical element is a broadband polarization protection mirror, that is, the reflected light wave is still a left-handed polarized light wave when the left-handed circular polarization is incident, and the reflected light wave is still a right-handed polarized light wave when the right-handed circularly polarized light wave is incident. The third optical element abso...

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Abstract

The invention provides a chiral optical element, a chiral optical encryption assembly and a chiral element design method, and relates to the technical field of optical chiral construction and opticalencryption. The chiral optical element provided by the invention comprises a substrate and a metal microstructure connected to the substrate; the metal microstructure comprises a first arc-shaped part, a second arc-shaped part and an extension part, and a central angle corresponding to the first arc-shaped part and a central angle corresponding to the second arc-shaped part are opposite vertex angles; the extending part is connected between the first arc-shaped part and the second arc-shaped part and extends along the side line of any central angle of the first arc-shaped part and the second arc-shaped part. The optical response of the chiral optical element provided by the invention has a remarkable optical spin selection characteristic, and the working wavelength and the response intensity of the chiral optical element can be flexibly regulated and controlled.

Description

technical field [0001] The invention relates to the technical field of optical chiral construction and optical encryption, in particular to a chiral optical element, a chiral optical encryption component and a chiral element design method. Background technique [0002] The left-handed and right-handed polarized light fields have opposite spins and exhibit inherent chirality in the process of interacting with substances, and then chiral substances show optical rotation and dichroism in the process of interacting with light fields. The measurement of optical rotation and dichroism of substances is the main way to identify the chirality of substances. However, the size of chiral molecules and atoms in nature is very small compared with the wavelength of light waves, and the chiral optical response of chiral substances is very weak. The existing materials in nature cannot achieve effective regulation of the circularly polarized light field. Based on the rational design of the ...

Claims

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Application Information

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IPC IPC(8): G02B27/28
CPCG02B27/28
Inventor 李占成陈树琪程化田建国
Owner NANKAI UNIV
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