Double-layer helical chiral asymmetric planar metamaterial circular dichroism device

A helical, asymmetric technology, applied in the directions of instruments, polarizing elements, optical elements, etc., can solve the problem of low circular dichroism, and achieve the effect of improving the integration performance, improving the application band range, and improving the localization strength.

Active Publication Date: 2021-06-29
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to propose a double-layer helical chiral asymmetric planar metamaterial circular dichroism device, to break through the limitations of the three-dimensional chiral metamaterial in the working frequency band and application field, and to solve the existing asymmetric planar metamaterial circular dichroism device. The problem of low circular dichroism in the material scheme

Method used

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  • Double-layer helical chiral asymmetric planar metamaterial circular dichroism device
  • Double-layer helical chiral asymmetric planar metamaterial circular dichroism device
  • Double-layer helical chiral asymmetric planar metamaterial circular dichroism device

Examples

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Effect test

Embodiment 1

[0028] The material of the substrate 1 is glass with a refractive index of 1.52, the material of the cladding layer 2 is a polymer with a refractive index of 1.5, the material of the helix is ​​Ag, and the parameter of the lower helix is ​​set to r 1 =W 1 =L 1 =40nm, T 1 = 120nm, the parameter of the upper spiral is set to r 2 =W 2 =L 2 =25nm, T 2 =120nm, the unit size of the up and down spiral array is p×p, p=500nm.

[0029] figure 2 is the transmission spectrum and circular dichroism spectrum of the present embodiment (wherein CD is the absolute value of the difference between the left-handed circularly polarized light and the right-handed circularly polarized light transmittance of the structure), and the solid line in the figure is the transmission spectrum to the right-handed circularly polarized light , the dotted line is the transmission spectrum for left circularly polarized light. It can be seen that there is a significant difference in the transmission spectrum...

Embodiment 2

[0031] The material of the substrate 1 is glass with a refractive index of 1.52, the material of the cladding layer 2 is a polymer with a refractive index of 1.5, the material of the helix is ​​Ag, and the parameter of the lower helix is ​​set to r 1 =W 1 =L 1 =56nm, T 1 = 120nm, the parameter of the upper spiral is set to r 2 =W 2 =L 2 =35nm, T 2 =120nm, the unit size of the up and down spiral array is p×p, p=500nm.

[0032] image 3 is the transmission spectrum and circular dichroism spectrum of the present embodiment (wherein CD is the absolute value of the difference between the left-handed circularly polarized light and the right-handed circularly polarized light transmittance of the structure), and the solid line in the figure is the transmission spectrum to the right-handed circularly polarized light , the dotted line is the transmission spectrum of left circularly polarized light. It can be seen that there is a significant difference in the transmission spectrum...

Embodiment 3

[0034] The material of the substrate 1 is glass with a refractive index of 1.52, the material of the cladding layer 2 is a polymer with a refractive index of 1.5, the material of the helix is ​​Ag, and the parameter of the lower helix is ​​set to r 1 =W 1 =L 1 =56nm, T 1 =200nm, the parameter of the upper spiral is set to r 2 =W 2 =L 2 =35nm, T 2 =200nm, the unit size of the up and down spiral array is p×p, p=500nm.

[0035] Figure 4 is the transmission spectrum and circular dichroism spectrum of the present embodiment (wherein CD is the absolute value of the difference between the left-handed circularly polarized light and the right-handed circularly polarized light transmittance of the structure), and the solid line in the figure is the transmission spectrum to the right-handed circularly polarized light , the dotted line is the transmission spectrum of left circularly polarized light. It can be seen that there is a significant difference in the transmission spectrum...

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Abstract

The invention discloses a double-layer helical chiral asymmetric planar metamaterial circular dichroism device, comprising a substrate 1, a cladding layer 2 located on the upper part of the substrate 1, and a circular dichroism action layer 3. The circular dichroism The active layer 3 is an array structure, the array structure is composed of a plurality of upper and lower layers of Archimedes helix array units with a certain scaling factor, the upper and lower layer Archimedes helixes are chiral metamaterials, and the lower layer The Archimedes spiral is covered by the cladding layer 2 and the thickness of the cladding layer 2 is the same as that of the lower Archimedes spiral, and the upper Archimedes spiral is located at the top of the cladding layer 2 . Compared with the existing three-layer asymmetric planar metamaterial structure, the double-layer helical chiral asymmetric planar metamaterial of the present invention greatly improves the circular dichroism performance and has a new working mechanism. The invention has broad application prospects in molecular structure detection, display, laser, imaging and other biological and optoelectronic fields.

Description

technical field [0001] The invention relates to the technical field of polarizers, in particular to a double-layer helical chiral asymmetric planar metamaterial circular dichroism device. Background technique [0002] Circular dichroism is a basic characteristic of chiral materials, which refers to the difference in response (such as absorption, reflection, and transmission) of chiral materials to different circularly polarized light. Most of the materials and biological tissues composed of molecules in nature have certain chirality, so circular dichroism spectroscopy can be developed to detect materials and analyze the structure of biomolecules. However, the chirality and circular dichroism of natural materials are weak, which limits their application in many fields. In contrast, artificial metamaterials have excellent structural adjustment flexibility, and can produce significant chirality and circular dichroism through reasonable design, so they have attracted extensive ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G02B27/28G02B1/00
CPCG02B1/002G02B5/3025G02B27/286
Inventor 蒋立勇梁爽张伟钱继松蒋剑莉
Owner NANJING UNIV OF SCI & TECH
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