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An electrically controlled terahertz polarizer based on a graphene grid strip structure and its application method

A technology of graphene and polarizers, which is applied in the field of terahertz band devices, can solve the problems of non-tunable polarizers, narrow spectral width range, and inconvenient integration, and achieve the effects of wide spectral width range, good compatibility, and easy processing

Active Publication Date: 2018-09-14
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide a graphene-based terahertz wave polarizer, which solves the problems of the existing polarizers that are not tunable, narrow in spectral width, single function and inconvenient to integrate

Method used

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  • An electrically controlled terahertz polarizer based on a graphene grid strip structure and its application method
  • An electrically controlled terahertz polarizer based on a graphene grid strip structure and its application method
  • An electrically controlled terahertz polarizer based on a graphene grid strip structure and its application method

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Embodiment 1

[0036]This embodiment provides a graphene-based electronically controlled terahertz polarizer, including at least two graphene layers 1, and a dielectric layer 2 is provided between every two adjacent graphene layers 1, and each layer of graphite Holes 5 are provided on the alkene layer 1, and holes 5 are also provided on each of the dielectric layers 2. The holes on the graphene layer 1 coincide with the holes on the dielectric layer 2, and each layer of graphene is There are multiple holes 5 on the layer 1, the number of holes on each layer of dielectric layer 2 is the same as the number of holes on each layer of graphene layer 1, and the number of holes on each layer of graphene layer 1 and The holes on each dielectric layer 2 are distributed in an array;

[0037] The graphene layers 1 of the even layers are connected together on one electrode 3, the graphene layers 1 of the odd layers are connected on the other electrode 3, and voltage regulation can be realized by applyin...

Embodiment 2

[0039] A preparation method of the polarizer described in Example 1, the polarizer is processed on the substrate or the terahertz element before use, and each layer structure is prepared layer by layer on the terahertz element or the substrate in order from bottom to top, including at least Two layers of graphene layers, a dielectric layer between every two adjacent graphene layers, an electrode connected to the even-numbered graphene layers and another electrode connected to the odd-numbered graphene layers, between the two electrodes Apply voltage to ensure that each dielectric layer completely separates adjacent graphite layers;

[0040] The preparation of the graphene layer adopts chemical vapor phase method, mechanical stripping method, epitaxial growth method or redox method; the preparation of the dielectric layer adopts vacuum evaporation method, spin coating method or chemical vapor deposition method; the preparation of the electrode adopts vacuum evaporation method. ...

Embodiment 3

[0042] A method for using the polarizer described in Embodiment 1, for a polarizer with a fixed number of layers, a constant voltage is applied to an electrode connected to an even-numbered graphene layer and another electrode connected to an odd-numbered graphene layer, and the As the voltage increases, the amplitude of the transmitted terahertz pulse whose polarization direction is parallel to the grid strip is observed to determine the control range. By changing the voltage, the polarization degree of the transmitted terahertz wave can be adjusted.

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Abstract

The invention discloses an electrically controlled terahertz polarizing plate based on graphene, which includes at least two graphene layers. Each layer of graphene has a grid-band structure. A dielectric layer is provided between each two adjacent graphene layers. The graphene layer separates the two graphene layers; the even-numbered graphene layers are jointly connected to one electrode, and the odd-numbered graphene layers are jointly connected to the other electrode. Voltage regulation can be achieved by applying voltage to the two electrodes. The polarizer prepared by the multi-layer film structure of the present invention can adjust the response frequency band, polarization degree and other performance parameters through the structural parameters of the grid strip, such as the width of the strip, spatial period, etc., and the number of graphene layers; through voltage regulation , can actively control the polarization degree of transmitted terahertz waves. In addition to the function of polarization, the present invention can also realize the function of selective modulation of terahertz waves in different polarization directions.

Description

technical field [0001] The invention belongs to the technical field of terahertz wave band devices, and in particular relates to a graphene-based terahertz wave polarizer. Background technique [0002] Terahertz waves refer to electromagnetic waves ranging from 0.3THz to 10THz, corresponding to wavelengths ranging from 0.03mm to 1mm. The terahertz band has higher spatial resolution (high frequency) and time resolution (picosecond pulse), less energy will not destroy matter, and it is the resonance frequency band of vibration and rotation of biological macromolecules. These characteristics make it have potential application prospects in fields such as broadband communication, radar, electronic countermeasures, electromagnetic weapons, astronomy, non-destructive testing, medical imaging, and security inspection. Before the 1980s, limited by the sources and detectors of terahertz waves, there were very few studies and applications involving this wave band. With the developmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30H01P3/20H01P11/00
CPCG02B5/3041H01P3/20H01P11/00
Inventor 周译玄任兆玉徐新龙李渭龙白晋涛
Owner NORTHWEST UNIV
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