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A nano-thin film with enhanced asymmetric transport and its preparation method

An asymmetric transmission and nano-film technology, which is applied in the field of electromagnetic wave polarization state regulation, can solve problems such as complex structure and unfavorable preparation, and achieve the effects of wide application range and field, strong asymmetric transmission effect, and enhanced chiral signal

Active Publication Date: 2021-04-06
厦门呈昱实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to greatly change the asymmetric transmission effect by designing a single-layer chiral structure and fine-tuning the area, and overcome the problem that the three-layer and double-layer gold nano-film structures are complicated and unfavorable for preparation

Method used

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  • A nano-thin film with enhanced asymmetric transport and its preparation method
  • A nano-thin film with enhanced asymmetric transport and its preparation method
  • A nano-thin film with enhanced asymmetric transport and its preparation method

Examples

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Embodiment 1

[0031] Such as figure 1 with figure 2 As shown, a nano-membrane for enhancing asymmetric transmission is composed of a plurality of identical nano-units arranged in a rectangular periodic array. The nano-unit is a square body. 11 and four identical semicircular holes 12; the four semicircular holes 12 are distributed on the outside of the rectangular hole 1; the diameter d of each semicircular hole 12 coincides with the edge of the corresponding rectangular hole 1 respectively. Such as figure 2 In the shown nano-film with enhanced asymmetric transmission, the diameter d of the semicircular hole 12 is not greater than the length w of the short side of the rectangular hole. The long side of the rectangular hole and There is an angle between the directions α , the included angle α 0°~180°. The nano-units are made of noble metal materials, preferably gold in this embodiment.

[0032] The invention is a planar chiral structure, which can produce asymmetric transmission ch...

Embodiment 2

[0034] In this embodiment, if the incident light is left-handed circularly polarized light, there are both left-handed circularly polarized light and right-handed circularly polarized light converted by the film in the outgoing light, and the effect of converting polarization state light in different outgoing lights is The difference is represented by the transmittance and the subscript "+-" ("-+") means that the left (right) circularly polarized light is incident, and the right (left) circularly polarized light is emitted. Such as figure 1 with figure 2 As shown, based on the nano-thin film with enhanced asymmetric transmission in the embodiment, the three-dimensional finite element method (FEM) calculation software COMSOL Multiphysics is used to perform calculation and simulation experiments, and the parameters of the structure are set:

[0035] The length of the long side of the rectangular hole l = 520nm, short side length w = 200nm, semi-circular hole radius r = 60...

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Abstract

The invention relates to the field of electromagnetic wave polarization regulation, in particular to a nano-film for enhancing asymmetric transmission and a preparation method thereof. It is composed of a plurality of identical nano-units arranged in a rectangular periodic array. There is a through hole, and the through hole is composed of a rectangular hole and four identical semicircular holes. The invention realizes high asymmetric transmission by utilizing the design of the nano-thin film that enhances the asymmetric transmission, and the signal is distributed in the visible light band to facilitate the detection of the signal. Moreover, the asymmetric transmission effect can be effectively enhanced through area fine-tuning, and the asymmetric transmission effect of the structure can be multiplied. It is simple, has more advantages in preparation, and has wider application range and fields.

Description

technical field [0001] The invention belongs to the field of regulation and control of electromagnetic wave polarization state, and in particular relates to a nano film for enhancing asymmetric transmission and a preparation method thereof. Background technique [0002] Chirality is the property of a structure that is non-superimposable with its mirror image. Due to the characteristics of the chiral structure, incident polarized light with different polarization states will produce different optical responses. Asymmetric transmission (Asymmetry Transmission, AT) is one of the optical chiral characterizations that have different conversion efficiencies for left-handed and right-handed polarized light. It can also be understood as the conversion of the same polarized light from the front and back of the structure. Efficiency varies. This special optical property makes the study of chiral structure have potential applications in many fields, such as biological monitoring, opt...

Claims

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Application Information

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IPC IPC(8): G02B5/30C23C14/04C23C14/18C23C14/30C23C14/58
CPCC23C14/042C23C14/18C23C14/30C23C14/5873G02B5/30
Inventor 赵文静
Owner 厦门呈昱实业有限公司
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