Scholarlink

<p>Chiral bound states in the continuum (BICs) in dielectric metasurfaces provide a compelling route to control light–matter interactions through high-quality resonances with strong polarization sensitivity. Here, we numerically demonstrate a tunable nanolaser based on chiral quasi-BICs supported by an all-dielectric metasurface composed of asymmetric InP semicircular rings. Breaking in-plane inversion symmetry enables a magnetic quadrupole-mediated chiral quasi-BIC that exhibits distinctly different Q-factors and near-field enhancements under LCP and RCP excitation. Capitalizing on this polarization-selective confinement, we achieve tunable lasing with ultralow thresholds of 10.97 µJ/cm² (LCP) and 8.32 µJ/cm² (RCP), attributed to asymmetric quasi-BIC radiation coupling. Furthermore, the lasing emission shows spectral narrowing from ~ 11&#xa0;nm to sub-nanometer linewidths and a 10⁶-fold intensity contrast between LCP and RCP at identical pump fluence. Our work establishes chiral quasi-BICs as a robust platform for dynamically reconfigurable nanolasers, with promising applications in polarization-sensitive photonics, chiral emission control, and adaptive optical systems.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Polarization-Tunable Lasing from Chiral Quasi-Bound State in the Continuum in Dielectric Metasurfaces

  • 期刊论文

  • 发表日期：

    2026年4月17日

查看全文
  • Zhijian Qiu,
  • Guiyang Hou,
  • Yingjie Ju,
  • Wudeng Wang

摘要

Chiral bound states in the continuum (BICs) in dielectric metasurfaces provide a compelling route to control light–matter interactions through high-quality resonances with strong polarization sensitivity. Here, we numerically demonstrate a tunable nanolaser based on chiral quasi-BICs supported by an all-dielectric metasurface composed of asymmetric InP semicircular rings. Breaking in-plane inversion symmetry enables a magnetic quadrupole-mediated chiral quasi-BIC that exhibits distinctly different Q-factors and near-field enhancements under LCP and RCP excitation. Capitalizing on this polarization-selective confinement, we achieve tunable lasing with ultralow thresholds of 10.97 µJ/cm² (LCP) and 8.32 µJ/cm² (RCP), attributed to asymmetric quasi-BIC radiation coupling. Furthermore, the lasing emission shows spectral narrowing from ~ 11 nm to sub-nanometer linewidths and a 10⁶-fold intensity contrast between LCP and RCP at identical pump fluence. Our work establishes chiral quasi-BICs as a robust platform for dynamically reconfigurable nanolasers, with promising applications in polarization-sensitive photonics, chiral emission control, and adaptive optical systems.