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<p>This study numerically and experimentally demonstrates the manifestation of electromagnetically induced transparency (EIT) due to quasi-bound states in the continuum (quasi-BICs) induced by symmetry breaking in terahertz metamolecules. The metamolecule comprises four square-shaped ring resonators, exhibiting a BIC mode protected by symmetry. Under the effect of mirror symmetry breaking, the BIC mode transforms into a quasi-BIC mode, manifesting as an EIT-like window. The study indicates that the EIT response remains invariant for polarizations and various incident angles. The BIC effect arises due to the strong coupling between the bright (continuum) and dark (discrete) modes. A coupled harmonic oscillator model is proposed to understand the coupling mechanism and establish a connection between BICs, quasi-BICs, and EIT evolution. It is observed that the transmission window exhibits a significant group delay of 17 ps, highlighting the strong slow-light effect within the metamolecule. Terahertz time-domain spectroscopy (THz-TDS) is employed to experimentally measure the fabricated samples, validating the simulation and theoretical findings. This study paves the way for developing novel THz devices, such as sensors and slow-light systems, exploiting high-Q resonances for applications in terahertz photonics.</p>

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Polarization-Independent Electromagnetically Induced Transparency in a Bound State in Continuum Assisted Terahertz Metamolecule

  • 期刊论文

  • 发表日期：

    2025年9月20日

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  • Bhairov Kumar Bhowmik,
  • Lavi Kumar Vaswani,
  • Anuraj Panwar,
  • Mukul Tigala,
  • Ashok Kumar,
  • Gagan Kumar

摘要

This study numerically and experimentally demonstrates the manifestation of electromagnetically induced transparency (EIT) due to quasi-bound states in the continuum (quasi-BICs) induced by symmetry breaking in terahertz metamolecules. The metamolecule comprises four square-shaped ring resonators, exhibiting a BIC mode protected by symmetry. Under the effect of mirror symmetry breaking, the BIC mode transforms into a quasi-BIC mode, manifesting as an EIT-like window. The study indicates that the EIT response remains invariant for polarizations and various incident angles. The BIC effect arises due to the strong coupling between the bright (continuum) and dark (discrete) modes. A coupled harmonic oscillator model is proposed to understand the coupling mechanism and establish a connection between BICs, quasi-BICs, and EIT evolution. It is observed that the transmission window exhibits a significant group delay of 17 ps, highlighting the strong slow-light effect within the metamolecule. Terahertz time-domain spectroscopy (THz-TDS) is employed to experimentally measure the fabricated samples, validating the simulation and theoretical findings. This study paves the way for developing novel THz devices, such as sensors and slow-light systems, exploiting high-Q resonances for applications in terahertz photonics.