Abstract :
Tailoring surface plasmons (SP) by controlling the design of metal surfaces at the nanometer scale has allowed addressing the intimate relation between the structures and the optical properties of coupled light. With the definition of plasmonic Bloch waves, it is possible to convey concepts from photonic crystals into SP optics. This can lead to the observation of negative refraction of SP beams and self-collimation effects. Optical forces are also generated by SP modes and this relation can lead, in plasmonic crystals, to mechanical effects exerted on nanoparticles analog to optical ones. But the specific spin angular momentum density associated with SP turns critical when evaluating associated forces. This leads to the important result that the plasmonic radiation pressure exerted on a nanoparticle is not simply proportional to the Poynting vector of the SP beam. This is a clear example where the fundamental relation between radiation pressure and orbital energy flow can be discussed most straightforwardly.
Contact Chercheur : Cyriaque Genet, ISIS, CNRS and University of Strasbourg
genet@unistra.fr
Invitation : Jérôme Wenger, équipe MOSAIC - jerome.wenger@fresnel.fr
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