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<p>A terahertz beam-modulated metasurface based on a composite medium of photosensitive silicon and gold is proposed, which can realize the dynamic modulation of terahertz beams without changing the shape, size, or orientation of the unit, but only by changing the conductivity of photosensitive silicon. The metasurface unit is capable of generating multimode multi-vortex beams with different topological charge numbers with high reflection amplitudes and phase differences close to <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11664_2025_11766_Article_IEq1.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="13" /> </InlineMediaObject> <EquationSource Format="TEX">\(\pi \)</EquationSource> <EquationSource Format="MATHML"><math> <mi>π</mi> </math></EquationSource> </InlineEquation> over a wide bandwidth from 1.39 THz to 1.89 THz. In addition, we have demonstrated the application of a metasurface in polarization imaging and successfully realized the polarization imaging of the Chinese character ’——’ through a specific arrangement of units. The theoretical analyses and electromagnetic simulation results verify the superior performance and mode purity of the metasurface unit structure. This study is not only innovative in theory, but it also shows great potential in practical applications, providing a novel solution for the field of terahertz beam modulation.</p>

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Dynamic Modulation of Terahertz Beams Based on Photosensitive Silicon-Gold Composite Metasurfaces

  • 期刊论文

  • 发表日期：

    2025年2月19日

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  • Haibo Yu,
  • Xuehong Sun,
  • Liping Liu,
  • Yanpeng Zhang,
  • Hongshun Liu,
  • Xin Jiang,
  • Tong Yu

摘要

A terahertz beam-modulated metasurface based on a composite medium of photosensitive silicon and gold is proposed, which can realize the dynamic modulation of terahertz beams without changing the shape, size, or orientation of the unit, but only by changing the conductivity of photosensitive silicon. The metasurface unit is capable of generating multimode multi-vortex beams with different topological charge numbers with high reflection amplitudes and phase differences close to \(\pi \) π over a wide bandwidth from 1.39 THz to 1.89 THz. In addition, we have demonstrated the application of a metasurface in polarization imaging and successfully realized the polarization imaging of the Chinese character ’——’ through a specific arrangement of units. The theoretical analyses and electromagnetic simulation results verify the superior performance and mode purity of the metasurface unit structure. This study is not only innovative in theory, but it also shows great potential in practical applications, providing a novel solution for the field of terahertz beam modulation.