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Bound states in the continuum (BICs) are localized states whose energies reside within the continuum of radiating modes. Optical BICs allow for the realization of photonic resonances with ultra-high Q-factors and far-field vortex beams, making them prime candidates for inducing exotic light-matter interactions. In this presentation, we explore the engineering of optical BICs within moiré photonic crystal (PhC) slabs. First, we demonstrate moiré flat-band quasi-BICs in a twisted bilayer PhC slab. Next, by controlling multiple topological charges, we theoretically design and experimentally realize a perfect moiré BIC in 1D PhC slabs. Finally, we extend the concept of BICs to quasi-bound flat bands in the continuum (BFICs), where all Bloch modes in a flat band exhibit the quasi-BIC behavior across all k-points above the light line. We propose two methods for realizing quasi-BFICs: the moiré design, and the counterintuitive disorder effects, which can randomly give rise to quasi-BFICs.

張蔚暄，北京理工大學物理學院教授，入選國家高層次青年人才計劃和中國科協青年人才托舉工程。主要從事基于人工結構的物態調控及應用研究：通過設計人工微納結構和拓撲電路網絡，揭示并實現多種新奇拓撲物態；借鑒拓撲物態獨特性質，開發新型功能化光電器件。以第一/通訊作者身份，在Nat. Commun. (9篇)，Phys. Rev. Lett. (6篇)，Adv. Mat., Light: Sci. & Appl., Sci. Bull.等期刊發表論文50余篇，6篇入選 ESI 高被引論文。