Localized Plasmon Resonance enhances trapping of Gold nanorods and reporting high resolution topography

摘要: The surface Plasmon Resonance property of metal nanoparticles has been known for a while. We report the Plasmon resonance of the trapping Au nanoparticle in this paper. We show how this effect could change the trapping force. We observe that the point spread function of the laser reduces to half of its initial size. This study is important for developing and designing plasmonic traps. The polarizability is measured using a much simpler method. Single particle scattering is measured for different powers of the laser and different sizes of Au nanoparticle. In this paper, also the sub-particle topography of the particle is reported for the first time in optical tweezers. We use the wavefront analysis of the Shack Hartmann sensor for taking topography of the 400 nm Au nanoparticle with a laser in the near-infrared region. This method has application in optical trapping, single particle spectroscopy and optical sensors