Enhanced Fano Resonance in Asymmetrical Au:Ag Heterodimers
Enhanced Fano Resonance in Asymmetrical Au:Ag Heterodimers
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DOI：
10.1021/jp200495x
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发表时间：
2011-04-14
影响因子：
3.7
通讯作者：
Alonso, M. I.
中科院分区：
文献类型：
--
作者：
Pena-Rodriguez, O.;Pal, U.;Alonso, M. I.
Au:Ag 纳米颗粒异二聚体的几何结构可以进行优化，以产生显着的法诺共振 (FR) 信号，该信号足够强，可以通过标准光谱技术检测到。当纳米粒子 (R-Au:R-Ag) 的尺寸比接近 3:1 时，这些双金属二聚体中的 FR 达到最高强度。此外，FR只能由二聚体表面等离子共振（SPR）的纵向分量诱导。最后，我们发现，在 n(m) < 1.5 的区域，二聚体 FR 信号对周围介质折射率变化 (n(m)) 的敏感度是相关 SPR 的 2 倍，这为利用 FR 波段实现更高效的光学传感应用提供了可能性。
The geometrical configuration of Au:Ag nanoparticle heterodimers can be optimized to produce prominent Fano resonance (FR) signals, strong enough to be detectable by standard spectroscopic techniques. The highest intensity of the FR in these bimetallic dimers is reached when the size ratio of the nanoparticles (R-Au:R-Ag) is close to 3:1. Moreover, the FR can be induced only by the longitudinal component of the dimer surface plasmon resonance (SPR). Finally, it is found that the sensitivity of the dimer FR signal to the variation in the refractive index of the surrounding medium (n(m)) is 2 times larger than that of the associated SPR for the region where n(m) < 1.5, which opens up the possibility of utilizing the FR band for more efficient optical sensing applications.