论文标题
Q因子介导的准BIC共振在非对称二聚体晶格中耦合
Q-factor mediated quasi-BIC resonances coupling in asymmetric dimer lattices
论文作者
论文摘要
连续体（BICS）中有限状态的谐振耦合提供了一种有效的方法，可以通过各种线形进行工程纳米结构的光学响应，同时保持超鼻涕线宽功能，共振的质量在其中起着至关重要的作用。对BIC共振的Q因子的独立操纵可以完全控制相互作用行为以及近场和远场光工程。在本文中，我们利用反射对称性（RS）和翻译对称性（TS）保护在不对称二聚体晶格中支持的BIC共振，并研究了受控的TS和RS扰动下的Q因子介导的共振偶联行为。我们专注于平面电偶极子BIC（EDI-BIC）和磁偶极BIC（MD-BIC），这些偶极子（MD-BIC）受RS保护，并受到TS保护的空间外电偶极子（Edo-BIC）。 EDI-BIC和EDO-BIC之间的耦合表现出谐振交叉行为，其中可以灵活地调节交叉处的传输光谱，显示出具有根据TS和RS扰动的Q因子具有纯相调制能力的电磁诱导的透明线条或满足晶格Kerker条件的。尽管MD-BIC和EDO-BIC之间的耦合显示出避免的共振交叉行为，在这种情况下，强烈的耦合共振将导致形成Friedrich-Wintgen BIC的形成，其光谱位置也可以通过调整Q因子来改变。我们的结果提出了一个有趣的平台，可以探索与独立的Q因子操纵能力，以实现多功能元驱动器。
Resonance coupling in the regime of bound states in the continuum (BICs) provides an efficient method for engineering nanostructure's optical response with various lineshape while maintaining an ultra-narrow linewidth feature, where the quality factor of resonances plays a crucial role. Independent manipulation of the Q factors of BIC resonances enables full control of interaction behavior as well as both near- and far-field light engineering. In this paper, we harness reflection symmetry (RS) and translational symmetry (TS) protected BIC resonances supported in an asymmetric dimer lattice and investigate Q-factor-mediated resonance coupling behavior under controlled TS and RS perturbations. We focus on in-plane electrical dipole BIC (EDi-BIC) and magnetic dipole BIC (MD-BIC) which are protected by RS, and out-of-plane electrical dipole BIC (EDo-BIC) protected by TS. The coupling between EDi-BIC and EDo-BIC exhibits a resonance crossing behavior where the transmission spectrum at the crossing could be tuned flexibly, showing an electromagnetically induced transparency lineshape or satisfying the lattice Kerker condition with pure phase modulation capability depending on TS and RS perturbed Q factors. While the coupling between MD-BIC and EDo-BIC shows an avoided resonance crossing behavior, where the strongly coupled resonances would lead to the formation of a Friedrich-Wintgen BICs whose spectral position could also be shifted by tuning the Q factors. Our results suggest an intriguing platform to explore BIC resonance interactions with independent Q factor manipulation capability for realizing multi-functional meta-devices.
