Parallel line dipole structure-based chiral metasurface terahertz polarizer

Abstract

The invention relates to a parallel line dipole structure-based chiral metasurface terahertz polarizer and belongs to the electromagnetic wave full-vector transmission control device technical field.The parallel line dipole structure-based chiral metasurface terahertz polarizer of the invention includes a dielectric substrate, a metal chiral structure surface layer disposed on the upper surface of the dielectric substrate, and a metal reflection plate surface layer disposed at the lower surface of the dielectric substrate. The parallel line dipole structure-based chiral metasurface terahertzpolarizer is characterized in that the metal chiral structure surface layer comprises an array of N*N orthogonally-arranged square cells; in each square cell, two symmetrically-disposed rectangular metal lines are distributed along one diagonal of the square; and an angle alpha between the long side of the metal line and the row line of the array is 45 degrees. The polarizer of the invention has the advantages of high polarization conversion efficiency, small insertion loss, small circular polarization phase difference, obvious out-of-band suppression, simple structure, small size, convenientcontrol and easiness in processing.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave full-vector transmission control devices, and relates to an ultra-broadband reflective terahertz linear polarization / left-handed and right-handed circular polarizer based on an artificial microstructure. Background technique [0002] The terahertz frequency band (Terahertz, THz, frequency 0.1-10THz, 1THz=1012Hz) is extremely rich in spectrum resources, which provides the possibility for wireless transmission of 10Gbps or even 100Gbps or more. The terahertz beam is moderate and does not require precise alignment. SAR) has high resolution, high frame rate and high penetration capability, so terahertz radar technology and wireless communication technology have very important application prospects. [0003] Traditional electromagnetic materials and the transmission function devices prepared by them are difficult to meet the requirements of terahertz application devices, while artificial e...

AI Technical Summary

Problems solved by technology

The polarizer can achieve high-bandwidth polarization conversion for linear polarization and left / right circularly polarized waves. The frequency range where the polarization efficiency is greater than 75% is 7.6GHz-15.5GHz, and the relative bandwidth is 68.4%, but the maximum The cross polarization conversion power efficiency (cross polarization conversion) is less than 90%, and the circular polarization phase difference is not ideal, the electrical length of the substrate thickness is 1 / 10 wavelength, and it is difficult to process in the terahertz frequency band

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