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<p>In this study, a symmetric and polarization-insensitive metamaterial structure in the terahertz (THz) region has been designed and simulated. The simulations are performed using the finite element method (FEM). This structure exhibits the phenomenon of electromagnetically induced transparency (EIT). The proposed unit cell consists of a cross resonator and a four-slit square ring resonator (FSSR). The FSSR is deposited on a polyimide layer placed on a quartz substrate. The EIT phenomenon arises from the destructive interference between the electric dipole and toroidal dipole moments. The transparency window appears at 0.92 THz with a transmission amplitude of 0.89. The resonance quality factor (Q) is 92, which represents a significant improvement compared to many previously reported structures. The proposed structure exhibits the same response to different polarizations. This feature enhances the stability and reliability of its performance in practical conditions. A red shift in the transparency window is observed with increasing refractive index of the metamaterial environment, yielding a sensitivity of 220 GHz/RIU. The results show that variations in geometric parameters have a substantial effect on the transmission amplitude and the resonance position. Accordingly, the presented metamaterial can serve as an efficient platform for high-performance THz photonic systems and highly sensitive optical sensing applications.</p>

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Numerical and circuit model analysis of a polarization-independent symmetric metamaterial exhibiting EIT for THz sensing applications

  • 期刊论文

  • 发表日期：

    2026年5月26日

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  • Seyedeh Roghayeh Hamidi,
  • Mohammad Razaghi

摘要

In this study, a symmetric and polarization-insensitive metamaterial structure in the terahertz (THz) region has been designed and simulated. The simulations are performed using the finite element method (FEM). This structure exhibits the phenomenon of electromagnetically induced transparency (EIT). The proposed unit cell consists of a cross resonator and a four-slit square ring resonator (FSSR). The FSSR is deposited on a polyimide layer placed on a quartz substrate. The EIT phenomenon arises from the destructive interference between the electric dipole and toroidal dipole moments. The transparency window appears at 0.92 THz with a transmission amplitude of 0.89. The resonance quality factor (Q) is 92, which represents a significant improvement compared to many previously reported structures. The proposed structure exhibits the same response to different polarizations. This feature enhances the stability and reliability of its performance in practical conditions. A red shift in the transparency window is observed with increasing refractive index of the metamaterial environment, yielding a sensitivity of 220 GHz/RIU. The results show that variations in geometric parameters have a substantial effect on the transmission amplitude and the resonance position. Accordingly, the presented metamaterial can serve as an efficient platform for high-performance THz photonic systems and highly sensitive optical sensing applications.