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.
Relazione su invito
II - Fisica della materia
Aula A224 - Giovedì 14 h 09:00 - 11:30
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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.