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Controlling the transmission angle of terahertz waves based on polarization-sensitive encoded metagrating metamaterials

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Abstract

A polarization-sensitive transmissive all-dielectric-encoded metagrating in the terahertz band is proposed. Encoded metagratings are composed of all-dielectric materials and have the advantages of high transmission characteristics and low loss. Based on the electromagnetic dipole resonance of the all-dielectric resonator, the phase mutation of the unit structure can be realized. The far-field scattering characteristics of the designed metagrating are analyzed. The encoding metagratings can adjust the transmission angle of the terahertz beam by changing the different arrangements of the basic units. According to the generalized Snell’s law, the beam scattering angle of the encoded metagrating is determined by the grating period. Therefore, for the traditional gradient-phase metagrating sequence, only the limited scattering angle can be regulated. To obtain the flexible regulation of the scattering angle of terahertz wave, we introduce the Fourier convolution principle in digital signal processing, and combine the signal control theory with the encoded metagrating sequence. The digitally encoded addition and subtraction operations are used to obtain a new encoded metagrating sequence, which enables flexible regulation of the far-field scattering angle of the terahertz beam.

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The authors declare that the data supporting the findings of this study are available within the article.

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Acknowledgements

Thanks to Dr. Xufeng Jing for his help in the writing and revision of the paper.

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  1. Jinan Vocational College, Jinan, China

    Junling Han

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  1. Junling Han
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Han, J. Controlling the transmission angle of terahertz waves based on polarization-sensitive encoded metagrating metamaterials. Opt Rev 30, 61–72 (2023). https://doi.org/10.1007/s10043-022-00784-7

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