Abstract
Inelastic tunneling of electrons can be used for generation of the surface plasmon-polaritons (SPPs). In this paper, we study numerically the surface waves generation during the electrons tunneling through the barrier between tip of the scanning-tunneling microscope probe and golden substrate. To study the process the emission of the tunneling electrons was approximated with an optical dipole emission. First, we demonstrate that the efficiency of the SPP generation in terms of energy conversion cannot exceed 1 % when no antenna is present in the system. We then carry out the simulation of the SPP generation when the probe tip is in a close proximity with the golden nanoantenna in the shape of sphere or cylinder. We show that the surface plasmon-polariton generation efficiency can be increased more than two orders of magnitude with the use ofnano-antennas. Nanoantennas in the form of spherical nanoparticles are found to be more effective for the SPPs generation than nanoantennas in the shape of cylinders.
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