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Label-Free Optical Sensing on Hybrid Plasmonic-Nanobiosilica Platforms

机译:等离子-纳米生物硅混合平台上的无标记光学传感

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Diatoms are single-celled algaes that make photonic-crystal-like silica shells or frustules with hierarchical micro- & nano-scale features consisting of two-dimensional periodic pores. In this paper, we present an innovative label-free optical sensor based on a biological-plasmonic hybrid nanostructure by self-assembling silver (Ag) nanoparticles into diatom frustules. The photonic-crystal-like diatom frustules provide a spatially confined electric field with enhanced intensity that can form hybrid photonic-plasmonic modes through the optical coupling with Ag nanoparticles. The experimental results demonstrate 4-6× and 9-12× improvement of sensitivities to detect the Raman dye for resonance and nonresonance SERS sensing, respectively.
机译:硅藻是单细胞藻类,可制造像光子晶体一样的硅石壳或壳,并具有由二维周期性孔组成的分层的微米和纳米级特征。在本文中,我们通过将银(Ag)纳米粒子自组装到硅藻壳中,提出了一种基于生物-等离激元混合纳米结构的创新型无标签光学传感器。光子晶体状硅藻壳提供了强度增强的空间受限电场,该电场可以通过与Ag纳米粒子的光耦合形成混合光子-等离激元模式。实验结果表明,分别检测共振和非共振SERS感应的拉曼染料的灵敏度提高了4-6倍和9-12倍。

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