Vasilii V. Klimov

Radiative frequency shift and linewidth of an atom dipole in the vicinity of a dielectric microsphere

The frequency shift and linewidth variation of an oscillator placed next to a dielectric microsphere are found within the framework of the classical approach. Both the frequency shift and the linewidth are shown to be substantially dependent on the location of the atom and the size of the microsphere and are capable of reaching very high values near the surface of the microsphere under resonance conditions. Near microsphere resonance, a blue frequency shift is predicted, leading to repulsive forces between the atom and the dielectric microsphere.

Effect of a dimer of nanoparticles on the linewidth of forbidden E2 transitions

In the framework of classical electrodynamics we have obtained and investigated analytical expressions for the radiation linewidth of forbidden E2 transitions in an atom located near a dimer of spherical particles. It is shown that the material of particles, their location and size have a significant effect on the linewidth of the E2 transition in the atom. It is found that in the gap between metal spherical nanoparticles, the linewidth of E2 transitions in the atom can take on substantially larger values than in the case of an atom near a single metal nanoparticle.