Enhanced Sensitivity of Delocalized Plasmonic Nanostructures.
Enhanced Sensitivity of Delocalized Plasmonic Nanostructures.
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DOI：
10.1021/jp410000u
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发表时间：
2013-12-05
期刊：
影响因子：
--
通讯作者：
Waldeck DH
中科院分区：
文献类型：
--
作者：
Mendis MN;Mandal HS;Waldeck DH
本文报道了在正方形银纳米颗粒（NP）的线性链中观察到离域表面等离子体共振（DSPR）现象，并将其作为链长和链中纳米颗粒之间距离的函数。银纳米颗粒链的透射光谱揭示了新的红移消光峰的出现，其强烈依赖于纳米颗粒之间的间距和激发光相对于链轴的偏振。随着线性链中纳米颗粒之间的间距减小以及线性链中纳米颗粒的数量增加，新消光特征的强度强烈增加。这些变化可以通过耦合链的紧结合模型来描述，这表明该现象的起源与纳米颗粒之间增加的耦合一致。FDTD计算表明，电场是强烈增强的纳米粒子之间的链。DSPR响应被发现是更敏感的介电变化比局域表面等离子体共振（LSPR）。
This work reports on the observation of a delocalized surface plasmon resonance (DSPR) phenomenon in linear chains of square-shaped silver nanoparticles (NP) as a function of the chain length and the distance between the nanoparticles in the chain. Transmission spectra of the silver nanoparticle chains reveal the emergence of new, red-shifted extinction peaks that depend strongly on the spacing between the nanoparticles and the polarization of the exciting light with respect to the chain axis. As the spacing between the nanoparticles in the linear chain decreases and the number of nanoparticles in the linear chain increases, the strength of the new extinction features increase strongly. These changes can be described by a tight-binding model for the coupled chain, which indicates that the origin of the phenomenon is consistent with an increased coupling between the nanoparticles. FDTD calculations reveal that the electric field is strongly enhanced between the nanoparticles in the chain. The DSPR response is found to be much more sensitive to dielectric changes than the localized surface plasmon resonance (LSPR).
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