Robust Ultrahigh-Q Quasi-Bound States in the Continuum in Metasurfaces Enabled by Lattice Hybridization,Advanced Optical Materials

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Robust Ultrahigh-Q Quasi-Bound States in the Continuum in Metasurfaces Enabled by Lattice Hybridization
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2023-09-07 , DOI: 10.1002/adom.202301130
Xiaoqing Luo ₁ , Yingying Han _{1,

2} , Xiang Du _{1,

2} , Shuai Chen ₃ , Guangyuan Li _{1,

4}

Affiliation

Bound states in the continuum (BICs) have been of growing interest in photonics for their infinite quality factors and strong field localization. The last decade has witnessed great progress on the highest achievable quality factors of quasi-BICs. However, it remains challenging to realize robust high-Q quasi-BICs that are tolerant to the parameter perturbation. Here, it is demonstrated that silicon metasurfaces formed by the hybridization of two lattices can support robust quasi-BICs with the highest measured quality factor reaching 4130 and the minimum one larger than 1024, even when the relative displacement varies over the whole range of all the possible values. Taking advantage of the two in-plane mirror-symmetry points, for the first time, the transition between a toroidal dipole BIC and an electric quadrupole BIC, which guarantees robust ultrahigh-Q quasi-BICs at Γ point, is reported. The minimum quality factors of quasi-BICs can be further improved significantly by shrinking the meta-atom size and are immune from the intrinsic absorption loss of silicon in the visible regime. It is envisioned that this study will pave the way for achieving robust ultrahigh-Q metasurfaces and boost their applications in lasing, nonlinear optics, and biosensing.

中文翻译：

通过晶格杂交实现超表面连续体中鲁棒的超高 Q 准束缚态

连续体束缚态 (BIC) 因其无限的品质因数和强大的场局域化而引起了光子学领域越来越多的兴趣。过去十年，准 BIC 在可实现的最高质量因素方面取得了巨大进步。然而，实现鲁棒的高Q 准 BIC 并能容忍参数扰动仍然具有挑战性。在这里，证明了由两种晶格杂化形成的硅超表面可以支持鲁棒的准BIC，测量的最高品质因数达到4130，最小品质因数大于1024，即使相对位移在所有晶格的整个范围内变化时也是如此。可能的值。利用两个面内镜面对称点，首次实现了环形偶极子BIC和电四极子BIC之间的过渡，保证了鲁棒的超高-Q报道了 Γ 点的准 BIC。通过缩小元原子尺寸，可以进一步显着提高准 BIC 的最低品质因数，并且不受可见光区域硅固有吸收损失的影响。预计这项研究将为实现强大的超高Q超表面铺平道路，并促进其在激光、非线性光学和生物传感中的应用。Q超表面。一个>

更新日期：2023-09-07

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