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a vo-based 2 dynamic terahertz metalens

A superlens and terahertz technology, applied in the directions of lenses, antennas, instruments, etc., can solve the problems of inability to achieve dynamic focus modulation and single focus of terahertz lenses, and achieve the effect of avoiding difficult processing, mature technology and easy production.

Active Publication Date: 2020-06-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above existing problems or deficiencies, in order to solve the problem that the existing terahertz lens has a single focus and cannot realize the dynamic modulation of the focus, the present invention provides a VO based 2 dynamic terahertz metalens

Method used

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  • a vo-based <sub>2</sub> dynamic terahertz metalens

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0026] In this embodiment, according to the principle of phase modulation, 16 unit structures that can cover 0 to 2π are designed, and the phases modulated by the 16 structures are based on the phase focusing formula:

[0027]

[0028] Calculated (Ф phase mutation value; focal length of F lens; radial outward distance of R lens; λ wavelength; k is an arbitrary integer).

[0029] The basic structure of the lens is a C-shaped split ring structure. The C-shaped split ring structure placed at an angle of 45° can realize polarization conversion. The transmitted wave after polarization conversion has a wide range of phase changes. Adjusting the size of the opening can adjust the polarization. Transformation phase, the first 1-12 structures are derived accordingly. According to the principle of geometric phase modulation, it can be known that the...

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Abstract

The invention belongs to the technical field of electromagnetic functional devices, and focuses on dynamic functional devices in the terahertz band. The invention adopts the phase modulation unit structure of vanadium dioxide C-shaped split ring, metal C-shaped split ring, and vanadium dioxide and metal composite split ring, and realizes the discontinuous change of phase according to the size of the structure, the orientation of the opening and the change of the split ring material; Utilize the phase change characteristics of vanadium dioxide to change the resonant mode of the structure, thereby changing the transmission phase of the structure, and realize the control of the dynamic focus of the metalens; the three phase modulation unit structures arranged in an array on the substrate have the ability of multiple phase selection function to realize terahertz beam convergence. Under laser irradiation, the x-line polarized terahertz wave is vertically incident, and the long-distance y-polarized beam is focused; under non-laser irradiation, the x-line polarized terahertz wave is vertically incident, and the long-distance y-polarized beam is focused . Finally, the dynamic switching between the far and near focal points is realized, and the dynamic modulation of the metalens is completed.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic functional devices, and focuses on dynamic functional devices in the terahertz band. Background technique [0002] The research of dynamically controlled or tunable terahertz devices is currently a hot direction and a development trend of future device research. The research of tunable devices based on metamaterials is usually based on different external conditions such as electric field, magnetic field, temperature, optical excitation, etc. to change the frequency or amplitude of the resonance point. For example, the electrical conductivity of photoconductive semiconductor materials is controlled by laser or the resistance of superconducting materials is controlled by temperature to design tunable THz modulators. This is more cost-effective than the previous method of obtaining tunability by changing the size of the structure. It does not require multiple processing tests, and a template...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B1/00G02B3/00H01Q19/06H01Q15/02
CPCG02B1/002G02B3/00H01Q15/02H01Q19/06
Inventor 陈婷张雅鑫杨梓强寇伟梁士雄施奇武
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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