Optical Forces and Manipulation of Momentum in Metamaterials and Plasmonics I
11:00 Invited talk : Local optical helicity at the nanoscale -visualisation and exploitation-
FOM Institute AMOLF (Netherlands) We show that optical singularities readily occur in the near field of nanophotonic structures. We visualize both phase- and polarization singularities in both the electric and magnetic field near plasmonic and photonic crystal structures with near-field microscopy. It turns out that their spatial evolution is distinct and unlike that of freely propagating beams. The local helicity associated with so-called C-points can be used to control the directionality of the emission of circular dipoles.
11:20 Invited talk : Optical forces in resonant plasmonic nanostructures and metamaterials
Iowa State University (USA) I will give an overview of optical forces arising between resonant plasmonic nanoparticles like nanospheres, nanowires and SRRs, and show how either strongly attractive or strongly repulsive forces can be achieved depending on the interplay of electric and magnetic interactions. I will discuss how optical forces in resonant metasurfaces can be used for electromagnetic levitation and to implement nonlinearity and tunability in metamaterials. Finally I will also consider optical forces arising from propagating surface plasmons in graphene.
11:40 Invited talk : Light-assisted Templated Self Assembly of Plasmonic Materials
N. Huang, L. J. Martinez, E. Jaquay, M. L. Povinelli
University of Southern California (USA) We demonstrate optical trapping of a closely spaced array of gold nanoparticles in the near field of a photonic crystal. The template is designed so that particle-template forces cooperate with interparticle interactions, producing highly stable assemblies of particles.
12:00 : Plasmon-induced Lorentz forces of nanowire chiral hybrid modes
Matthew Moocarme, Benjamin Kusin, Luat T. Vuong
CUNY Queens College (USA) The light-induced motion of plasmonic materials differs fundamentally from that of dielectric media. We demonstrate that significant translation and torque arise via Lorentz forces and surface-bound currents when linearly-polarized light illuminates metallic nanowires.
12:15 : Angular momentum manipulation in hybrid plasmonic waveguides
Qin Chen, Wanwan Liu, Lin Jin
Chinese Academy of Sciences (China) Manipulating spin angular momentum (SAM) and orbit angular momentum (OAM) are promising techniques for boosting the capacitance of telecommunications. Conventional optical elements like polarizers and phase plates, or recently developed metallic antennas have been proposed to manage light beam in free space. Here, we propose a simple method to generate angular momentum in hybrid plasmonic waveguides, leading to compact devices and on chip signal processing capability. Both polarization rotation and OAM are demonstrated in sub-waveguides.