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A kind of chiral metal nano film

A metal nano and metal film technology, applied in the direction of polarizing elements, can solve the problems of poor detection effect and inconspicuous circular dichroism signal, and achieve the effects of simple structure, enhanced dichroism, and reduced preparation cost

Active Publication Date: 2020-12-18
嘉兴奥腾电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the research of chiral metal nanostructures in the prior art, by designing a two-dimensional metal thin film chiral structure, it has been possible to modulate the polarization characteristics of the beam or to detect the circular dichroism of chiral substances, but when the detected signal itself is relatively weak When , the obtained circular dichroism signal is not obvious, which makes the detection effect not very good

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  • A kind of chiral metal nano film
  • A kind of chiral metal nano film
  • A kind of chiral metal nano film

Examples

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Embodiment 1

[0026] See figure 1 , figure 1 It is a schematic diagram of a chiral metal nano film provided by the embodiment of the present invention. The chiral metal nanofilm of the present embodiment comprises a metal film 1 and a semi-circular slit 2 and an in-line slit 3 provided on the metal film 1, wherein the metal film 1 is in a rectangular shape, and the length of the in-line slit 3 is The direction is parallel to the first side 11 of the metal film 1, and the width direction of the inline slit 3 is parallel to the second side 12 adjacent to the first side 11 of the metal film 1; Both the one end 21 and the second end 22 are parallel to the first side 11 ;

[0027] Further, the length d of the first side 11 of the metal film 1 1 In the range of 400nm-1000nm; the length d of the second side 12 of the metal film 1 2 In the range of 400nm-1000nm. The thickness range of the metal film 1 is 20nm-100nm. The material of the metal film 1 is a good conductor, such as gold, silver, c...

Embodiment 2

[0033] In this embodiment, the metal film 1 is preferably made of gold material, and the lengths of the first side 11 and the second side 12 are equal to 500 nm; the thickness of the metal film 1 is 30 nm; The radius of the circle is r=100nm, the radius of the outer circle is R=140nm, and the width is w=40nm; the length of the inline slit 3 is l=180nm, and the width is w=40nm; the inline slit 3 is close to the semicircular annular slit The distance D between one end of 2 and the lowermost end of the semicircular slit 2 is 150nm.

[0034] In addition, in other embodiments, the metal film 1 can be prepared by using copper metal instead of gold, so as to reduce the preparation cost of the chiral metal nanometer.

[0035] See figure 2 , figure 2 It is a schematic diagram of the circular dichroism produced by the chiral metal nano film of the embodiment of the present invention. When a beam of left circularly polarized light (left circularly polarized, LCP) is incident from th...

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Abstract

The present invention relates to a chiral metal nanofilm comprising a metal film, a semicircular slit and a linear slit which are disposed on the metal film, wherein the metal film is in a rectangularshape; the length direction of the linear slit is in parallel to the first side edge of the metal film; the width direction of the linear slit is in parallel to the second side edge of the metal filmadjacent to the first side edge; the first end and the second end of the semicircular slit are both in parallel to the first side edge; and the center of the semicircular slit protrudes toward the first side edge. The chiral metal nanofilm of the invention is greatly improved in circular dichroism by adding the linear slit structure to the film structure, is simple in structure, can be prepared by replacing gold or silver with copper, and reduces the preparation cost of a chiral material.

Description

technical field [0001] The invention belongs to the technical field of metal nanomaterials, in particular to a chiral metal nano film. Background technique [0002] Chirality, the property that a structure cannot be superimposed on its mirror image, has important implications in a variety of disciplines. An object is said to be "chiral" if it is different from its mirror image, and its mirror image cannot be superimposed on the original object, just as the left hand and right hand are mirror images of each other and cannot be superimposed. [0003] Circular Dichroism (CD) is a very important method to study chiral compounds. In the study of chiral molecular asymmetry, when left-handed circularly polarized light and right-handed circularly polarized light are incident, chiral materials will exhibit different effective refractive indices and different propagation speeds. When the metamaterial has extremely strong chirality, it even exhibits a negative refractive index. Negat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30
CPCG02B5/30
Inventor 尹晓雪张亮
Owner 嘉兴奥腾电子科技有限公司
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