Nanophotonics and Metrology Laboratory, Swiss Federal Institute of Technology Lausanne (EPFL), 1015 Lausanne, Switzerland.
Nano Lett. 2010 Mar 10;10(3):1006-11. doi: 10.1021/nl904168f.
The optical trapping of Au nanoparticles with dimensions as small as 10 nm in the gap of plasmonic dipole antennas is demonstrated. Single nanoparticle trapping events are recorded in real time by monitoring the Rayleigh scattering spectra of individual plasmonic antennas. Numerical simulations are also performed to interpret the experimental results, indicating the possibility to trap nanoparticles only a few nanometers in size. This work unveils the potential associated with the integration of plasmonic trapping with localized surface plasmon resonance based sensing techniques, in order to deliver analyte to specific, highly sensitive regions ("hot spots").
研究人员展示了在等离子体偶极子天线的缝隙中对尺寸小至 10nm 的金纳米粒子进行光阱捕获。通过实时监测单个等离子体天线的瑞利散射光谱，记录单个纳米粒子的捕获事件。数值模拟也被用于解释实验结果，表明了仅捕获几纳米大小的纳米粒子的可能性。这项工作揭示了将等离子体捕获与基于局域表面等离子体共振的传感技术相结合的潜力，以便将分析物输送到特定的、高灵敏度的区域（“热点”）。
