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Numerical Modeling of Tunable Reflection Scattering Angle Control Based on Ge2Sb2Te5 Phase Change Metamaterials

  • METHODS OF WAVE SCATTERING IN INHOMOGENEOUS MEDIA
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Abstract

To reduce the ohmic loss of the encoding metasurface and achieve continuous control of the scattering angle larger than 70°, we numerically study all dielectric reflective metasurface in the mid-infrared waveband. Free control of the deflection angle of the far-field scattered beam is achieved. The unit structure designed consists of the Ge2Sb2Te5 phase change material and the substrate. The phase difference between each two-unit structures is 90° and has high reflectivity in the working band. We can arrange the four units to construct metasurfaces with different coding sequences and perform Fourier convolution operations on the metasurfaces with different coding sequences to obtain flexible control of the reflected beam. The reflection characteristics of the coding sequence in the crystalline and amorphous states of the Ge2Sb2Te5 phase change material are demonstrated. The abnormal reflection angle phenomenon of the simulated structure was theoretically analyzed.

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

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Funding

This work was supported by Natural Science Foundation of Zhejiang Province (Nos. LY22F050001 and LZ21A040003) and National Natural Science Foundation of China (No. 62175224).

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Authors and Affiliations

  1. Special Equipment College, Hangzhou Vocational and Technical College, 310018, Hangzhou, China

    Jianfeng Xu & Fuhai Liu

  2. College of Information Engineering, Hangzhou Vocational and Technical College, 310018, Hangzhou, China

    Lizhen Xu

  3. Institute of Optoelectronic Technology, China Jiliang University, 310018, Hangzhou, China

    Xin Huang & Xufeng Jing

  4. College of Metrology and Measurement Engineering, China Jiliang University, 310018, Hangzhou, China

    Bo Fang

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  1. Jianfeng Xu
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  2. Lizhen Xu
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Xu, J., Xu, L., Liu, F. et al. Numerical Modeling of Tunable Reflection Scattering Angle Control Based on Ge2Sb2Te5 Phase Change Metamaterials. Phys. Wave Phen. 32, 105–116 (2024). https://doi.org/10.3103/S1541308X24700055

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