等离子体纳米结构中的Fano共振效应及其应用

摘要

Fano resonance is a resonance scattering phenomenon with an asymmetric spectral line shape,which originated from the quantum interference between resonant and non-resonant paths.Recently,Fano resonance in plasmonic nanostructures has been observed and developed to a research hotspot in nanophotonics.Plasmonic Fano resonance usually exhibits a narrow spectral line width,and cannot be excited by incident light and localizes at near field regions with a large electromagnetic field congregation and enhancement.Due to its special optical properties,Fano resonance has wide and significant applications in the areas such as single-molecule detection,high sensitivity sensing,enhanced spectrum,perfect absorption,electromagnetically induced transparency and slow-light photonic devices.%Fano共振效应是一种具有非对称线型的共振散射现象,起源于共振过程和非共振过程的量子干涉效应.近年来,在等离子体纳米结构中Fano共振现象也被发现,并成为纳米光子学的一个研究热点.等离子体Fano共振通常具有较窄的光谱线宽,且不能直接与入射光耦合,只能局域在近场,强的近场局域特性可以获得巨大的表面电磁场增强.由于等离子体Fano共振独特的光学特性,已经被应用到单分子探测、高灵敏度传感、增强光谱、完美吸收、电磁诱导透明和慢光光子学器件等众多领域当中.