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Efficient broadband circular polarization conversion device and method based on meta-surface

A circularly polarized and brilliant technology, applied in polarizing elements, instruments, optical elements, etc., can solve the problems of limited application occasions and difficult realization of devices, and achieve the effect of reducing volume and weight, strong applicability, and ultra-high conversion efficiency

Active Publication Date: 2017-11-10
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

It can be seen that among the reported metasurface polarization conversion devices, it is difficult to realize a device with high conversion efficiency and broadband operation in the near-infrared band, which limits its application

Method used

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  • Efficient broadband circular polarization conversion device and method based on meta-surface
  • Efficient broadband circular polarization conversion device and method based on meta-surface
  • Efficient broadband circular polarization conversion device and method based on meta-surface

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Embodiment 1

[0035] In order to verify the feasibility and beneficial effects of the metasurface-based high-efficiency broadband circular polarization conversion device and method disclosed in the present invention, the metasurface with a working wavelength of λ=1.2 μm to 1.6 μm is taken as an example below.

[0036] Such as figure 1 As shown, the metasurface-based high-efficiency broadband circular polarization conversion device disclosed in this embodiment is a composite structure, including an Ω-shaped nano-antenna layer 1 , a spacer dielectric layer 2 and a metal base layer 3 . The Ω-type nanoantenna layer 1 is used to generate specific phase and amplitude modulation for the incident linearly polarized light. It is composed of Ω-type nano-antennas arranged in an array with double mirror symmetry, and each Ω-type nano-antenna unit includes a Ω type nano-antenna, the unit size of the Ω-type nano-antenna is much smaller than the wavelength. The spacer dielectric layer 2 is used to accumu...

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Abstract

The invention discloses an efficient broadband circular polarization conversion device and method based on a meta-surface, belonging to the technical field of micro nano optical application. The efficient broadband circular polarization conversion device based on a meta-surface, which is of a composite structure, includes a nano antenna layer, an interval dielectric layer and a metal substrate layer. The nano antenna layer is used for generating a specific phase for and modulating the amplitude of incident linearly polarized light. The interval dielectric layer is used for accumulating the phase change of optical wave. The metal substrate layer is used for reflecting the optical wave propagated to the surface of the metal substrate layer to improve the overall conversion efficiency of the device. The nano antenna layer, the interval dielectric layer and the metal substrate layer constitute an optical resonant cavity. The beams propagated in the optical resonant cavity can produce a Fabry-Perot multi-beam interference effect. The invention further discloses an efficient broadband circular polarization conversion method based on a meta-surface implemented using the circular polarization conversion device. Efficient and broadband modulation of outgoing circularly polarized light is realized.

Description

technical field [0001] The invention relates to a high-efficiency broadband circular polarization conversion device and method based on metasurfaces, belonging to the technical field of micro-nano optics applications. Background technique [0002] Polarization state is one of the important properties of electromagnetic waves. Controlling the polarization state of electromagnetic waves and realizing the conversion of different polarization states has a wide range of applications in the fields of optical sensing, imaging, communication, and chemical analysis. The polarization state of electromagnetic waves can be controlled by decomposing the incident light into two orthogonal beam components and then making it achieve the desired phase delay. The traditional method of modulating the polarization state is mainly based on anisotropic materials, such as materials with birefringence properties. When the light is not incident along the main axis, different phase changes accumulat...

Claims

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Application Information

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IPC IPC(8): G02B5/30
CPCG02B5/3041
Inventor 黄玲玲张天瑶王涌天
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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