Optothermal escape of plasmonically coupled silver nanoparticles from a three-dimensional optical trap.
Optothermal escape of plasmonically coupled silver nanoparticles from a three-dimensional optical trap.
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DOI：
10.1021/nl2003544
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发表时间：
2011-04-13
期刊：
影响因子：
10.8
通讯作者：
Feldmann J
中科院分区：
文献类型：
--
作者：
Ohlinger A;Nedev S;Lutich AA;Feldmann J
我们证明了多个银纳米粒子的光学捕获受到纳米粒子的等离子体耦合的强烈影响。利用暗场瑞利散射成像和光谱学技术，对多个银纳米粒子进行了三维捕获，实验研究了耦合等离子体共振的时间演化及其对捕获稳定性的影响。随着时间的推移，耦合增强，可以观察到耦合等离子体散射的逐渐红移。当耦合等离子体激元与捕获激光波长发生共振时，阱就会失稳，纳米粒子从阱中释放出来。通过对捕获势的建模，并将其与不同纳米粒子分离距离下的等离子体加热效率进行比较，揭示了捕获不稳定的热机制。我们的研究结果提供了对适合于场增强的等离子体纳米结构的三维光学操作的特异性的见解，例如表面增强拉曼散射。
We demonstrate that optical trapping of multiple silver nanoparticles is strongly influenced by plasmonic coupling of the nanoparticles. Employing dark-field Rayleigh scattering imaging and spectroscopy on multiple silver nanoparticles optically trapped in three dimensions we experimentally investigate the time-evolution of the coupled plasmon resonance and its influence on the trapping stability. With time the coupling strengthens, which is observed as a gradual red-shift of the coupled plasmon scattering. When the coupled plasmon becomes resonant with the trapping laser wavelength, the trap is destabilized and nanoparticles are released from the trap. Modeling of the trapping potential and its comparison to the plasmonic heating efficiency at various nanoparticle separation distances suggests a thermal mechanism of the trap destabilization. Our findings provide insight into the specificity of three-dimensional optical manipulation of plasmonic nanostructures suitable for field enhancement, for example for surface enhanced Raman scattering.
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