Abstract
Propagation of plasmon-polariton in a metallic nano-chain in a dielectric surroundings is almost undamped and irradiation-less and such nano-chains are considered as quasi-perfect wave-guides for plasmon-polaritons. If, however, a chain is deposited on a semiconductor substrate or embedded in a semiconductor surroundings, plasmon-polaritons are strongly quenched due to the energy transfer from plasmon oscillations to band electrons in the semiconductor medium via the near-field coupling channel. For the reverse direction of this energy transfer the balance of the thermal losses of plasmon-polariton can be achieved. By a control of a dielectric spacing between the metallic nano-chain and the semiconductor substrate (and a type of the deposition), various regimes for coupling of two systems can be organized. We present the exact solution for propagation of strongly damped plasmon-polaritons in metallic nano-chain due to coupling of plasmons with band electrons in the semiconductor substrate.
Highlights
Experimental and theoretical investigation of plasmon oscillations in metallic nanoparticles and metallic nano-arrays has a growing significance for applications in nanophotonics and plasmonics
We describe the propagation of plasmon-polaritons in a metallic nano-chain deposited on a semiconducor substrate or embedded in a semiconductor medium including a coupling of plasmons with semiconductor band system in near-field-zone and related energy transfer between plasmon-polaritons and semiconductor electrons
Coupling of dipole plasmon mode with closely located band electrons in a semiconductor opens a very quick and effective channel for energy transfer, which results in strong damping of plasmon-polaritons in metallic nano-chains deposited on or embedded in a semiconductor surrounding/substrate
Summary
Let us recall that plasmon properties in metallic nanoparticles depend on a nanoparticle size. The related momentum incommensurability at the same energy of photons and plasmon-polaritons causes that the latter do not irradiate energy and propagate along metallic nano-chains over large distances [11, 24]. We describe the propagation of plasmon-polaritons in a metallic nano-chain deposited on a semiconducor substrate or embedded in a semiconductor medium including a coupling of plasmons with semiconductor band system in near-field-zone and related energy transfer between plasmon-polaritons and semiconductor electrons. We will analyze the surface dipole-type plasmons in a single metallic nanosphere (within the formerly formulated RPA model [29, 30]) including damping effects, in particular of the Lorentz friction of plasmons resulting in the far-field-zone radiation and the additional energy outflow via channel of near-field-zone coupling of dipole plasmons to electrons in a substrate semiconductor. The propagation of damped plasmon-polaritons will be analyzed for longitudinal and transverse polarizations of plasmon oscillations with respect to the propagation direction and for variety of geometry and size and material details of the whole system configuration
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