Relazione su invito

Optomechanical forces in adiabatic compression of surface plasmon polaritons.

Biasiucci M., De Angelis F., Folli V., Galeotti F., Jacassi A., Leonetti M. Ruocco G., Tanussi F.
  Giovedì 14/09   09:00 - 11:30   Aula A224   II - Fisica della materia
The laser propulsion of nanosized "bullets" is a challenging goal with different application. Until now the main problems in accelerating nanoparticles lie in the use of high laser power, due to the inefficient optomechanical interaction of the non-metallic particles, or in difficult control of the thrust, due to strong absorption bands and scattering in the favorable case of metallic particles. In this talk I will show how the propagation of the surface plasmon polariton (SPP) modes on particular structure, showing the well-known adiabatic compression effect, could bring to a significant optical pressure employable as a propulsive mechanism. Following a numerical simulation of the phenomenon, we study experimentally the response of tapered nano-conical gold tip to a low-power laser and show the correlation between the dimension of the apex of the nanotip and the momentum transferred to the structure by the photons.