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Double helix chiral asymmetric planar meta-material circular dichroic device

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

Active Publication Date: 2018-12-07
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 helix chiral asymmetric planar meta-material circular dichroic device
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Examples

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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 spiral is Ag, and the parameter of the lower spiral 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 upper and lower spiral array is p×p, p=500nm.

[0029] figure 2 Are the transmission spectrum and circular dichroism spectrum of this embodiment (where CD is the absolute value of the difference between the left-handed circularly polarized light and right-handed circularly polarized light of the structure), the solid line in the figure is the right circularly polarized light transmission spectrum , The dotted line is the transmission spectrum of the left circularly polarized light. It can be seen that there is a significant difference in the transmission spectrum near 1400nm and 2000nm, and the corresponding cir...

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 spiral is Ag, and the parameter of the lower spiral 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 upper and lower spiral array is p×p, p=500nm.

[0032] image 3 Is the transmission spectrum and circular dichroism spectrum of this embodiment (where CD is the absolute value of the difference between the left-handed circularly polarized light and right-handed circularly polarized light transmittance of the structure), and the solid line in the figure is the transmission spectrum of right circularly polarized light , The dotted line is the transmission spectrum of the left circularly polarized light. It can be seen that there is a significant difference in the transmission spectrum near 1600nm and 2200nm, and th...

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 spiral is Ag, and the parameter of the lower spiral 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 cell size of the upper and lower spiral arrays is p×p, p=500nm.

[0035] Figure 4 Are the transmission spectrum and circular dichroism spectrum of this embodiment (where CD is the absolute value of the difference between the left-handed circularly polarized light and right-handed circularly polarized light transmittance of the structure), and the solid line in the figure is the transmission spectrum of right circularly polarized light , The dashed line is the transmission spectrum of the left circularly polarized light. It can be seen that there is a significant difference in the transmission spectrum around 1650nm and 2250nm, a...

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Abstract

The invention discloses a double helix chiral asymmetric planar meta-material circular dichroic device comprising a substrate 1 and a cladding layer 2 and a circular dichroic acting layer 3 which arearranged on the upper part of the substrate 1. The circular dichroic acting layer 3 has an array structure. The array structure is composed of a plurality of upper-and-lower-layer Archimedes helix array elements with certain scaling coefficient. The upper and lower layers of Archimedes helixes are made of chiral meta-material, the lower layer of Archimedes helix is covered by the cladding layer 2and the thickness of the cladding layer 2 is the same as the thickness of the lower layer of Archimedes helix, and the upper layer of Archimedes helix is arranged on the upper part of the cladding layer 2. Compared with the existing three-layer asymmetric planar meta-material structure, the circular dichroic performance can be greatly enhanced by the double helix chiral asymmetric planar meta-material and the meta-material has a brand-new working mechanism. The device has wide application prospect in the biological and optoelectronic field of molecular structure detection, display, laser, imaging and the like.

Description

Technical field [0001] The invention relates to the technical field of polarizers, in particular to a double-layer helix chiral asymmetric planar metamaterial circular dichroic device. Background technique [0002] Circular dichroism is the basic characteristic of chiral materials, which refers to the difference in response of chiral materials to different circularly polarized light (such as absorption, reflection, transmission). Most of the materials and biological tissues composed of molecules in nature have a certain degree of chirality. Therefore, circular dichroism spectroscopy technology 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. Therefore, i...

Claims

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Application Information

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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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