Perfect absorption and phase singularities induced by surface lattice resonances for plasmonic nanoparticle array on a metallic film
Perfect absorption and phase singularities induced by surface lattice resonances for plasmonic nanoparticle array on a metallic film
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金属薄膜上等离子体纳米粒子阵列的表面晶格共振引起的完美吸收和相位奇点
DOI：
10.1364/oe.475248
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发表时间：
2022-12-05
期刊：
影响因子：
3.8
通讯作者：
Liu, Shao-ding
中科院分区：
文献类型：
--
作者：
Bai, Yating;Zheng, Haiyan;Liu, Shao-ding
利用金属纳米粒子阵列和金属薄膜构建的杂化结构，在参数空间中形成与位相奇异性相关的完美吸收对，有望增强光与物质的相互作用。然而，阵列的局域等离子体共振具有很强的辐射损耗，这是提高阵列性能的一个障碍。与亚波长阵列杂化结构相反，本研究表明，通过增大晶格间距，纳米粒子的振子强度可以随着表面晶格共振的形成而增强，从而由于与法布里-珀罗腔模式的相互作用而产生相似但窄得多的完美吸收对。此外，当表面等离子体激元极化模移到与增大晶格间距相关的相同光谱范围时，与表面晶格共振的耦合和模式杂化导致光谱中的反扭曲。虽然共振耦合没有进入强耦合区，但由于有效地抑制了辐射损耗，使得杂化共振模的品质因数(-134)和近场增强(-44)比局域等离子体共振态的品质因数(-134)和近场增强(-44)都得到了极大的提高，这使得杂化结构对于生物传感、多模型纳米化和高质量成像等功能纳米光子器件的设计是有用的。
The formation of pairs of perfect absorption associated with phase singularities in the parameter space using the hybridized structure constructed with a metallic nanoparticle array and a metallic film is promising to enhance light-mater interactions. However, the localized plasmon resonances of the array possess strong radiative losses, which is an obstacle to improve the performances for many applications. On the contrary with the subwavelength array hybridized structure, this study shows that by enlarging the lattice spacing, the oscillator strength of the nanoparticles can be enhanced with the formation of surface lattice resonance, thereby leading to similar but much narrower pairs of perfect absorption due to the interactions with the Fabry-Perot cavity modes. Furthermore, when the surface plasmon polariton mode shift to the same spectral range associated with the enlarged lattice spacing, the coupling and mode hybridization with the surface lattice resonance result in an anticrossing in the spectra. Although the resonance coupling does not enter the strong coupling regime, the quality factors (- 134) and near-field enhancements (- 44) are strongly enhanced for the hybridized resonance modes due to the effectively suppressed radiative losses compared with that of the localized plasmon resonances, which make the hybridized structure useful for the design of functional nanophotonic device such as biosensing, multi-model nanolasing, and high-quality imaging.