Theoretical study on narrow Fano resonance of nanocrescent for the label-free detection of single molecules and single nanoparticles.
Theoretical study on narrow Fano resonance of nanocrescent for the label-free detection of single molecules and single nanoparticles.
复制标题
纳米新月窄法诺共振无标记检测单分子和单纳米粒子的理论研究
DOI：
10.1039/c7ra12666b
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发表时间：
2018-01-16
期刊：
影响因子：
3.9
通讯作者：
Sun, Zhenrong
中科院分区：
文献类型：
--
作者：
Zheng, Chunjie;Jia, Tianqing;Zhao, Hua;Xia, Yingjie;Zhang, Shian;Feng, Donghai;Sun, Zhenrong
本文报道了三维纳米晶体的窄Fano共振及其在单分子无标记检测中的应用。Fano共振不仅取决于差距的大小，而且取决于高度。Fano共振起源于水平新月形支撑的四极模与沿纳米尖端沿着的偶极模之间的干涉。当三维纳米晶体的高度为30 nm时，Fano共振的宽度仅为10 nm。窄线宽是由来自纳米尖的偶极模式与纳米晶体的四极模式重叠的强窄共振吸收引起的，其中吸收光谱是在水平入射光下计算的。窄Fano共振对被纳米粒子捕获的单个纳米粒子高度敏感。波长偏移随折射率线性增加，关系为Δλ = 22.10n-28.80，随捕获纳米颗粒尺寸增加，关系为Δλ = 0.826 × r1.672。这些结果表明，如果半径为2.5 nm的蛋白质纳米颗粒被纳米颗粒捕获，则位移高达4.03 nm。
This paper reports a narrow Fano resonance of 3D nanocrescent and its application in the label-free detection of single molecules. The Fano resonance depends not only on the gap size but also on the height. The Fano resonance originates from the interference between the quadrupolar mode supported by the horizontal crescent and the dipolar mode along the nanotip. When the height of 3D nanocrescent is 30 nm, the width of Fano resonance is as narrow as 10 nm. The narrow linewidth is caused by the strong narrow resonant absorption coming from the dipolar mode of nanotip overlapping with the quadrupolar mode of nanocrescent, where the absorption spectra are calculated under a horizontal incident light. The narrow Fano resonance is highly sensitive to a single nanoparticle trapped by the nanocrescent. The wavelength shift increases linearly with the refractive index with the relation of Δλ = 22.10n − 28.80, and increases with the size of trapped nanoparticle following a relation of Δλ = 0.826 × r1.672. These results indicate that if a protein nanoparticle with radius of 2.5 nm is trapped by the nanocrescent, the shift is as large as 4.03 nm.
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