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Polarization-controlled surface plasmon bifunctional metasurface and design and preparation method thereof

A surface plasmon and design method technology, applied in the field of nanophotonics, can solve the problem of occupying a large space, and achieve the effects of large-area processing, high reflectivity, and improved integration.

Active Publication Date: 2020-04-21
PEKING UNIV
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  • Application Information

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Problems solved by technology

[0003] On a macro scale, basic optical elements such as prisms, lenses, and mirrors are commonly used to adjust the properties of incident light. The realization of complex optical functions requires the combination of various optical elements, which takes up a lot of space.

Method used

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  • Polarization-controlled surface plasmon bifunctional metasurface and design and preparation method thereof
  • Polarization-controlled surface plasmon bifunctional metasurface and design and preparation method thereof
  • Polarization-controlled surface plasmon bifunctional metasurface and design and preparation method thereof

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Embodiment 1

[0044] (1) Clarify the basic structure and working mode of the dual-functional metasurface. The schematic diagram of its structure is as follows figure 1 shown.

[0045] (2) Carry on the simulation design through the time domain finite difference method. Perform phase and amplitude simulations for the two polarization directions of x and y respectively, and select the materials of the metal-dielectric-metal three-layer structure as aluminum, silicon oxide, and aluminum respectively, and the ideal key structural parameters are: t 1 =20nm,t 2 = 50nm, t 3 =200nm, P x =185nm,P y =555nm, w 1 =30nm,w 2 = 140nm. This design ensures that the incident light within the wavelength range of 360nm to 540nm produces a complete phase shift of 2π within a structural period (such as figure 2 shown). The longitudinal length l of the trapezoidal unit structure is selected to be 250nm-450nm. The variable l value in this range ensures that the surface plasmon resonance wavelength covers...

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Abstract

The invention discloses a polarization-controlled surface plasmon bifunctional metasurface and a design and preparation method thereof. The metasurface longitudinally adopts a metal-medium-metal three-layer structure, the surface includes a trapezoidal unit structure array, independent regulation and control of the amplitude and the phase of light in different polarization states are achieved, phase regulation and control can be conducted on polarized light in the x direction, and the function of a deflector is achieved. Amplitude regulation and control can be carried out on polarized light inthe y direction to achieve a structural color function. According to the bifunctional structure, the integration level and the regulation and control diversity of the metasurface structure are improved, deflection and structural color are independent of each other and supplement each other, and the combination of the two functions provides a brand-new solution for anti-counterfeiting, measurementof birefringence of biological tissue and measurement of optical rotation of biomolecules.

Description

technical field [0001] The invention relates to the field of nanophotonics, in particular to the design and manufacture of miniaturized and integrated optoelectronic devices, in particular to a surface plasmon dual-function metasurface and its design and preparation method. Background technique [0002] In 2011, the Federico Capasso research group of Harvard University proposed the concept of metasurface for the first time. Metasurface is a synthetic sub-wavelength two-dimensional electromagnetic functional material, which has many physical properties and effects that natural materials do not have, such as: negative refractive index characteristics, negative phase velocity characteristics, super-resolution imaging effects, nonlinear enhancement effects, Anomalous light transmission effects, etc. The formation mechanism of these physical properties and effects is: the subwavelength metasurface structure can produce a unique optical response to the incident electromagnetic wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/00G02B27/00G02B1/00G02B5/30
CPCG02B1/007G02B5/008G02B5/30G02B27/0012
Inventor 吴文刚黄允朱佳陈小瑜
Owner PEKING UNIV
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