论文标题
在等离子晶格中连续体中表面晶格共振和结合状态的共存
Coexistence of Surface Lattice Resonances and Bound states In the Continuum in a Plasmonic Lattice
论文作者
论文摘要
我们介绍了一项关于亚波长膜覆盖的2D等离子体结构的数值研究。我们使用偶联偶极近似解释了表面晶格共振（SLR）的起源，并表明可以通过改变光学环境来控制连续体（BICS）中衍射辅助的等离子共振和结合态的形成。我们的研究表明，当折射率对比度很小（$δ$ n <-0.1）时，SLR就不会感到兴奋，而显着的对比度（$δ$ n> 0.3）不仅持续等离激元引起的共振，而且还形成了对称性造成对称性的和偶然的BICS。该结果可以有助于在生物传感器和光电设备中的光结合相互作用以及应用的研究中简化等离子体晶格的设计。
We present a numerical study on a 2D array of plasmonic structures covered by a subwavelength film. We explain the origin of surface lattice resonances (SLRs) using coupled dipole approximation and show that the diffraction-assisted plasmonic resonances and formation of bound states in the continuum (BICs) can be controlled by altering the optical environment. Our study shows that when the refractive index contrast is small ( $Δ$n < -0.1), the SLR cannot be excited, while a significant contrast ($Δ$n > 0.3) not only sustains plasmonic-induced resonances but also forms both symmetry-protected and accidental BICs. The results can aid the streamlined design of plasmonic lattices in studies on light-matter interaction and applications in biosensors and optoelectronic devices.
