AI 中文总结
该研究提出并验证了一种介质纳米光子平台，通过集成介质超表面与分布式布拉格反射镜，在可见光波段同时实现超窄带完美吸收与连续谱中束缚态，为高性能超构光学器件提供新路径。
AI 中文摘要
在可见光波段产生超窄带完美吸收与连续谱中束缚态（BICs）的能力，对诸多先进光学与纳米光子学应用而言极具价值且备受需求。然而，由于材料背景吸收、辐射损耗及制备限制，在可见光波段实现高品质因子的完美吸收与BICs仍具挑战性。本文提出并验证了一种介质纳米光子平台，其通过将介质超表面与分布式布拉格反射镜（DBR）集成，在可见光波段同时实现了完美吸收（603 nm处吸收率达99.0%）与多个对称性保护的BICs。超表面的局域介质共振与DBR辅助光子模式间的耦合抑制了辐射泄漏，使DBR阻带内产生超窄带共振（半高全宽约0.65 nm），并伴随强电磁场（|E|）增强（最高达16.4倍）。此外，超表面的非对称设计可实现磁多极辅助的准BIC共振，具有偏振相关的简并模式，而周期性结构则可实现米氏共振辅助的多个BICs。同时，设计参数的可调性为控制共振及其光谱位置提供了额外自由度。在可见光波段的紧凑型介质纳米光子平台内，完美窄带吸收与BICs的共存，为下一代低损耗、高性能超构光学器件及技术奠定了极具前景的路径。
英文摘要
The ability to generate ultranarrow-band perfect absorption and bound states in the continuum (BICs) in the visible spectrum is highly useful and desired for many advanced optical and nanophotonic applications. However, achieving perfect absorption and BICs with a high quality-factor in the visible region remains challenging due to the material background absorption, radiative losses, and fabrication constraints. Here, we propose and demonstrate a dielectric nanophotonic platform that simultaneously achieves perfect absorption (99.0% at 603 nm) and multiple symmetry-protected BICs in the visible by integrating a dielectric metasurface with a distributed Bragg reflector (DBR). The coupling between the metasurface's localized dielectric resonances and the DBR-assisted photonic mode suppresses radiative leakage and enables ultranarrow-band resonances (full-width at half-maximum ~ 0.65 nm) with strong electromagnetic field (|E|) enhancement (up to 16.4 folds) within the DBR stopband. In addition, the metasurface's asymmetric design enables a magnetic multipole-assisted quasi-BIC resonance with polarization-dependent mode degeneracies, and the periodic structure enables Mie resonance-assisted multiple BICs. Furthermore, the tunability of design parameters provides additional degrees of freedom to control the resonances and their spectral positions. The coexistence of perfect narrowband absorption and BICs within a compact dielectric nanophotonic platform in the visible establishes a promising route toward next-generation low-loss, high-performance meta-optical devices and technologies.
