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Optical trapping and sensing with plasmonic dipole antennas

机译：等离子偶极子天线的光陷波和传感

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In this work, we study how to use a plasmonic dipole antenna as a multifunctional nanodevice for surface-enhanced Raman spectroscopy (SERS), localized surface plasmon resonance (LSPR) -based sensing and optical trapping. An analytical model is implemented to link the local electric field enhancement with the gradient forces, as well as the resonance shift caused by the presence of the analyte which can be a molecule or a nanoparticle. We find that a higher local field enhancement induces stronger trapping forces and a larger resonance wavelength shift. Experiments were also performed using plasmonic dipole antennas. Strong SERS signals were observed from the nanogap of an antenna, trapping of Au nanoparticles as small as 10 nm was achieved with a moderate laser power, and evident resonance shifts of the antenna associated with the trapping events were also observed. These results are consistent with our theoretical result that the giant field enhancement generated by a plasmonic dipole antenna also generates strong gradient forces and a high spectral sensitivity.
机译：在这项工作中，我们研究了如何使用等离子偶极子天线作为多功能纳米器件，用于基于表面增强拉曼光谱（SERS），基于局部表面等离子体激元共振（LSPR）的传感和光阱。实施分析模型以将局部电场增强与梯度力以及由分析物（可能是分子或纳米粒子）的存在引起的共振位移联系起来。我们发现，较高的局部场增强引起较强的俘获力和较大的共振波长偏移。还使用等离子偶极子天线进行了实验。从天线的纳米间隙观察到强SERS信号，使用适度的激光功率可以捕获到10 nm的Au纳米颗粒，并且还观察到天线与捕获事件相关的明显共振位移。这些结果与我们的理论结果一致，即等离子偶极子天线产生的巨大场增强也产生强梯度力和高光谱灵敏度。

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