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Quasi-metal wire structure for realizing on-chip wavefront shaping and application of asymmetric transmission

A metal wire and wavefront technology, which is applied in the field of on-chip wavefront shaping design and on-chip asymmetric transmission of ionic polaritons, can solve the problems of large material loss, large volume, and inability to integrate photonic systems, etc., and achieve easy on-chip level Integrated, simple design effects

Active Publication Date: 2021-09-24
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Irreversibility has traditionally been achieved with magneto-optic materials, time-varying components, or nonlinear materials, which are lossy and too bulky to be integrated into modern photonic systems
As far as we know, for SPP waves in visible light, there is no method for the study of its on-chip irreversible light propagation, so it is also very challenging to realize broadband on-chip irreversible light propagation, so how to make various optical devices more compact , miniaturization, multi-function, on-chip integration, etc., urgently need new technological innovation and revolution

Method used

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  • Quasi-metal wire structure for realizing on-chip wavefront shaping and application of asymmetric transmission
  • Quasi-metal wire structure for realizing on-chip wavefront shaping and application of asymmetric transmission
  • Quasi-metal wire structure for realizing on-chip wavefront shaping and application of asymmetric transmission

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Embodiment 1

[0034] This embodiment is a specific design process of a one-dimensional plasmonic metal-like wire structure, and a specific implementation method of using it to realize the in-plane deflection of the SPP in the broadband visible light region.

[0035] In this embodiment, the trapezoidal silver nanoantenna is used as the unit structure of the one-dimensional plasmonic metal-like wire, such as figure 1 As shown, a slit with a width of 100 nm is etched on the silver film with a thickness of 200 nm at the bottom to excite the SPP mode, and a silicon dioxide layer is used as an intermediate layer with a thickness of 50 nm. Using the electromagnetic simulation software FDTD Solutions to optimize the trapezoidal silver nanoantenna layer, the period of the trapezoid (that is, the longitudinal distance of the nanoantenna) is 950nm, the bottom and top bottom are 450nm and 60nm, respectively, and the thickness and height are 130nm and 800nm, respectively. The SPP mode excited by the sli...

Embodiment 2

[0037] In this embodiment, the realization of the asymmetric deflection of the SPP in the broadband visible light region can be achieved by cascading gratings behind the one-dimensional plasmonic metal-like wires to obtain an in-plane double-layer structure, such as Figure 4 shown.

[0038] In this example, the distance figure 1A periodic silver grating structure is placed at an interval of 900 nm behind the one-dimensional plasmon metal-like wire in the 2nd layer, and the structural parameters and position of the grating of the second layer are optimized and designed by FDTD Solutions. Considering the performance of asymmetric transmission and the size of the device, the parameters of the grating are selected as follows: the period of the grating (that is, the longitudinal distance of the grating) is also 950 nm, the length and width are 1350 nm and 150 nm, respectively, and the thickness is the same as that of the trapezoidal structure. Both are 130 nm, and the ridges of t...

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Abstract

The invention provides a quasi-metal wire structure for realizing on-chip wavefront shaping and application of asymmetric transmission. The one-dimensional plasmon metal wire structure is formed by stacking a bottom layer metal film, a middle layer dielectric medium and an upper layer metal trapezoid nanometer antenna; and the metal trapezoidal nano antennas are periodically and longitudinally arranged on the dielectric medium of the middle layer in a one-dimensional manner. The one-dimensional plasmon metal wire structure can respond to the wavelength of a broadband visible light area, and in-plane SPP wave deflection in broadband visible light is achieved. On the basis of the structure, the array grating is arranged to form a cascade double-layer structure, the structure can achieve the asymmetric deflection transmission function of in-plane SPP, and then the function of an in-plane asymmetric lens is achieved through further design. The one-dimensional plasmon metal wire structure and the cascade structure have the advantages of simple structure, small size, easy on-chip integration and the like, and can be widely applied to the important fields of on-chip conversion optical devices, waveguide devices, information processing, spectrometers, sensing and the like.

Description

technical field [0001] The invention belongs to the technical field of micro-nano near-field optics and integrated photonics, and in particular relates to an on-chip wavefront shaping design and on-chip asymmetric transmission technology based on surface plasmon polaritons. Background technique [0002] Conventional 3D metamaterials and 2D metasurfaces have shown overwhelming capabilities in controlling electromagnetic waves. However, the challenge of fabricating complex 3D bulk structures or nanoscale alignment between layers limits their practical applications and prevents the realization of on-chip integrated photonic devices. Therefore, the emerging on-chip meta-device dimensionality reduction design will have broad research value. [0003] To realize multifunctional on-chip photonic integrated devices, device systems that can manipulate surface waves in a plane are particularly needed. Surface plasmon polaritons (SPPs) are electromagnetic waves that propagate along th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/00G02B6/122
CPCG02B5/008G02B6/1226
Inventor 李仲阳时阳阳万成伟杨睿郑国兴李子乐代尘杰万帅
Owner WUHAN UNIV