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Adjustable broadband polarization conversion and dynamic geometric phase modulation device based on phase change material

A phase change material, polarization conversion technology, applied in instruments, nonlinear optics, optics, etc., can solve problems such as inability to dynamically adjust, achieve high polarization conversion efficiency, simple structure, and reduce overall quality and volume.

Active Publication Date: 2018-03-23
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the existing metasurfaces are passive metasurfaces. Once the constituent materials, pattern shape, size, repetition period, and arrangement form of the metasurface constituent units are determined, their functions will be solidified and cannot be dynamically adjusted. In practical applications have great limitations

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  • Adjustable broadband polarization conversion and dynamic geometric phase modulation device based on phase change material
  • Adjustable broadband polarization conversion and dynamic geometric phase modulation device based on phase change material
  • Adjustable broadband polarization conversion and dynamic geometric phase modulation device based on phase change material

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Embodiment

[0035] like figure 1Shown is a schematic structural diagram of an adjustable broadband polarization conversion and dynamic geometric phase modulation device based on phase change materials in the present invention, the device includes from bottom to top: a metal reflection layer 4, a phase change material layer 3, and a dielectric isolation layer 2 And the metasurface structure layer 1. Wherein, the metal reflection layer 4 is a 0.2 micron thick gold film, the phase change material layer 3 is a 0.5 micron GST phase change material film layer, the dielectric isolation layer 2 is a 0.5 micron MgF2 film layer, and the super The surface structure layer 1 is a 0.1 micron thick gold structure with a period of 4.2 microns.

[0036] Circularly polarized incident light with as figure 1 The anisotropic metasurface interacts as shown, and the metal rod-like structure will introduce different phase delays in the electric field components whose polarization directions are along the two o...

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Abstract

The invention provides an adjustable broadband polarization conversion and dynamic geometric phase modulation device based on phase change material, comprising a metal reflecting layer, a phase changematerial layer, a dielectric isolation layer and a super surface structural layer sequentially from bottom to top. The design of the polarization conversion and geometric phase modulation device is carried out based on the phase change material; optical material parameters of the phase change material, such as crystal state and dielectric constant, are changed by means of electric excitation, optical excitation and thermal excitation; dynamic modulation of polarization conversion is achieved within a broad band range; accordingly, designs of a novel functional device, such as adjustable beamdeflection, plate lens, and calculation of holographic and orbital angular momentums. A method of the invention may provide further improved ability of electromagnetic modulation of super surface, anda new idea and technical scheme are provided for the design of novel adjustable-function electromagnetic modulation elements.

Description

technical field [0001] The invention belongs to the field of electromagnetic wave modulation, in particular to an adjustable broadband polarization conversion and dynamic geometric phase modulation device based on phase-change materials. Background technique [0002] Traditional polarization conversion is mainly based on the anisotropy and Brewster effect of natural materials, while traditional phase modulation introduces different phase accumulations in different electromagnetic wave transmission paths through traditional materials. Polarization conversion and phase modulation elements based on traditional materials are commonly used in various optical systems and devices. However, most of the polarization conversion and phase modulation elements based on conventional materials have relatively narrow bandwidth due to the phase delay introduced by conventional materials that is dependent on the incident wavelength. Although broadband polarization conversion and phase modula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/01
CPCG02F1/0136
Inventor 罗先刚蒲明博张作军张明马晓亮
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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