A high-efficiency metasurface device based on catenary structure

A catenary and high-efficiency technology, applied in instruments, nonlinear optics, optics, etc., can solve the problems of low efficiency of discrete regulation, low diffraction efficiency of devices, and increased processing difficulty, achieving simple structure, low loss, and improved efficiency effect

Active Publication Date: 2020-09-25
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

Discrete modulation can cause inefficiency, for example, for large angle deflection, since only a very small number of sub-wavelength structures can be filled in one grating period, which leads to low diffraction efficiency of the device
One of the solutions is to reduce the period of the subwavelength structure, so that a grating period can be filled as much as possible with the subwavelength structure, so that the wavefront tends to be continuous, but this will also greatly increase the processing difficulty

Method used

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  • A high-efficiency metasurface device based on catenary structure
  • A high-efficiency metasurface device based on catenary structure
  • A high-efficiency metasurface device based on catenary structure

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Embodiment 1

[0033] Without loss of generality, this embodiment designs a high-efficiency metasurface device for the mid-infrared band of 10.6 μm, and this invention is also applicable to the optical band, terahertz band and microwave band. Such as figure 1 As shown, the unit structure includes: a dielectric substrate 2 and a dielectric catenary grating structure 1 . Wherein, both the substrate and the catenary grating structure are made of silicon. The thickness h of the catenary grating structure is 4.7 μm, the longitudinal period of the catenary Py=3.3 μm, the span of the catenary l=0.75Px, and the width of the catenary w 1 The maximum value of is 1.2 μm, and the number of vertical gratings m=round(0.375Px / Py), where round represents a rounding function. In this embodiment, CST electromagnetic simulation software is used to simulate and test the performance of the device. During the simulation process, the refractive index of silicon is set to 3.36.

[0034] figure 2 (a)-2(d) are s...

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Abstract

The present invention provides a high efficiency supersurface device based on a catenary structure, comprising a dielectric substrate and a dielectric catenary structure from bottom to top. The invention is ingenious in design and simple in structure, and can realize high-efficiency regulation and control of electromagnetic waves through a variable-width medium catenary grating structure. The invention can be used for designing high-efficiency super-surface functional devices such as lens, beam splitting, deflection, imaging and the like, and has important significance for promoting the practicality of the super-surface.

Description

technical field [0001] The invention relates to the technical field of electromagnetic wave phase regulation, in particular to a high-efficiency metasurface device based on a catenary structure. Background technique [0002] Metasurface is a new type of artificial electromagnetic material with subwavelength structures arranged according to certain rules, and its thickness is less than one wavelength. Metasurfaces have flexible control capabilities for electromagnetic waves, including polarization, phase, and amplitude. At present, most metasurface devices are composed of periodic structural arrangements, which means that the regulation of electromagnetic waves is discrete. Discrete modulation can lead to inefficiencies, for example, for large-angle deflection, because only a very small number of subwavelength structures can be filled in one grating period, which leads to low diffraction efficiency of the device. One of the solutions is to reduce the period of the subwavele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/00G02F1/01
CPCG02F1/0081G02F1/0102
Inventor 罗先刚马晓亮蒲明博张飞李雄
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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