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<p>A tetramer metasurface with strong coupling of meta-atoms under C<sub>2</sub> symmetry is proposed to realize polarization-dependent bound states in continuum (BICs) with the random forest regressor algorithm assistance. The quality (<i>Q</i>) factor of quasi-BIC correlates with the centralization degree of the tetramer structure, which is determined by the photonic band characteristics. The quasi-BIC is dominated by a hybrid of electric dipole and quadrupole in <i>E</i><sub>x</sub> polarization (<i>Q</i> &gt; 10<sup>4</sup>), whereas only electric dipole dominates quasi-BIC (<i>Q</i> &gt; 10<sup>3</sup>) in <i>E</i><sub>y</sub> polarization. These findings demonstrate a novel strategy to achieve ultrahigh <i>Q</i>-factor resonances in terahertz photonics.</p>

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Polarization dependent bound states in continuum in a tetramer metasurface discovered by random forest algorithm

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月31日

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  • Chenjie Jia,
  • Zhenyu Zhao,
  • Jun Wang

摘要

A tetramer metasurface with strong coupling of meta-atoms under C2 symmetry is proposed to realize polarization-dependent bound states in continuum (BICs) with the random forest regressor algorithm assistance. The quality (Q) factor of quasi-BIC correlates with the centralization degree of the tetramer structure, which is determined by the photonic band characteristics. The quasi-BIC is dominated by a hybrid of electric dipole and quadrupole in Ex polarization (Q > 104), whereas only electric dipole dominates quasi-BIC (Q > 103) in Ey polarization. These findings demonstrate a novel strategy to achieve ultrahigh Q-factor resonances in terahertz photonics.