论文标题
通过FANO谐振介电元面成像，由quasi-bic管辖
Imaging through Fano-resonant dielectric metasurface governed by quasi-BIC
论文作者
论文摘要
Fano共振引起了纳米光子学的极大关注。在这项工作中，我们研究了由持续体（BICS）中的准结合状态管理的Fano共振硅元苏尔菲克的成像功能。首先，通过打破纳米界的平面内对称性，对称对称性保护的准BIC对尖锐的Fano共振的出现感到兴奋。执行跨场的近场分布，多极贡献和辐射模式，以发现这种共振的机理和特征。此外，我们研究了这种fano谐振元表面的成像功能，并通过相变材料GE_2SB_2TE_5（GST）辅助。通过选择性修改从A-GST到C-GST的不同单元，产生的传输图像很好地重建了目标字母。我们的发现可能提供了实现有效的基于跨表面的成像和快速空间调制的途径。
Fano resonance has raised great attention in nanophotonics attributing to its unique properties.In this work, we study the imaging function of Fano-resonant silicon metasurfece governed by quasi-bound states in the continuum (BICs). First, by breaking the in-plane symmetry of nanodisks, a symmetry-protected quasi-BIC is excited with the emergence of a sharp Fano resonance. The near field distributions, multipole contributions and radiation patterns of the metasurface are performed to uncover the mechanism and characteristics of this resonance. In addition, we investigate the imaging function of this Fano-resonant metasurface assisted by phase-change material Ge_2Sb_2Te_5(GST). Through selective modification of different units from a-GST to c-GST, the produced transmitted image well reconstructs the target letter. Our finding may provide a route to achieve efficient metasurface-based imaging and fast spatial modulations.
