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<p>We present a bilayer design in a terahertz metamaterial consisting of two triangular resonators that can manipulate broadband cross-polarization conversions and three-band unidirectional reflectionlessnesses by using the phase-change material VO<sub>2</sub> for the incidence of linearly and circularly polarized waves. When VO<sub>2</sub> is in metallic state, the broadband cross-polarization conversion effects are realized in range of 0.41 THz<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="340_2025_8547_Article_IEq1.gif" Format="GIF" Height="6" Rendition="HTML" Resolution="72" Type="Linedraw" Width="17" /> </InlineMediaObject> <EquationSource Format="TEX">\(\sim \)</EquationSource> </InlineEquation>0.54 THz and the polarization conversion ratio reaches <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="340_2025_8547_Article_IEq1.gif" Format="GIF" Height="6" Rendition="HTML" Resolution="72" Type="Linedraw" Width="17" /> </InlineMediaObject> <EquationSource Format="TEX">\(\sim \)</EquationSource> </InlineEquation>1. We also find that the proposed structure has the ability to convert linear polarizations into circular polarizations at 0.39 THz and 0.59 THz. When VO<sub>2</sub> is in insulator state, three-band unidirectional reflectionlessnesses are attained at 0.50 THz, 0.72 THz and 0.81 THz based on Fabry–P<InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="340_2025_8547_Article_IEq3.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="10" /> </InlineMediaObject> <EquationSource Format="TEX">\({\mathrm{\acute{e}}}\)</EquationSource> </InlineEquation>rot resonant coupling between the upper and lower triangular resonators.</p>

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Manipulation of cross-polarization conversion and unidirectional reflectionlessness by VO2 in a terahertz metamaterial

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Wenxuan Yuan,
  • Ying Qiao Zhang,
  • Xing Ri Jin

摘要

We present a bilayer design in a terahertz metamaterial consisting of two triangular resonators that can manipulate broadband cross-polarization conversions and three-band unidirectional reflectionlessnesses by using the phase-change material VO2 for the incidence of linearly and circularly polarized waves. When VO2 is in metallic state, the broadband cross-polarization conversion effects are realized in range of 0.41 THz \(\sim \) 0.54 THz and the polarization conversion ratio reaches \(\sim \) 1. We also find that the proposed structure has the ability to convert linear polarizations into circular polarizations at 0.39 THz and 0.59 THz. When VO2 is in insulator state, three-band unidirectional reflectionlessnesses are attained at 0.50 THz, 0.72 THz and 0.81 THz based on Fabry–P \({\mathrm{\acute{e}}}\) rot resonant coupling between the upper and lower triangular resonators.