Near-field effect in two-atom system
Institute of Radio Engineering and Electronics of Russian Academy of
Sciences, Goncharov Str. 48, Ulyanovsk Branch 432700, Russia
Revised: 26 January 2000
Published online: 15 August 2000
The self-consistent problem is solved for the interaction of two dipole atoms situated at arbitrary distance from one another with the field of quasiresonant light wave. Atoms are considered to be linear Lorenz oscillators. Polarizing fields inside the system include both Coulomb and retarding parts. The solutions obtained are investigated for the case when atoms have the same polarizabilities and interatomic distance is much less than external light wavelength. Formulas for electric fields inside and outside of small object are obtained. It is shown that longitudinal and transverse optical oscillations are possible to exist inside small two-atom object. Dispersion laws of these oscillations depend upon interatomic distance and upon angle between axis of the system and the direction of propagation of external wave. The field outside the small object in wave zone is linearly polarized with the choice of linear polarization of external field. However, the directions of polarization of these waves are different and depend essentially upon frequency. The amplitude of field outside small object in wave zone is shown to depend essentially on the frequency of external field and interatomic distance. The results obtained are treated as near-field effect in the optics of small objects making it possible to investigate the structure of small objects with optical radiation.
PACS: 42.25.Bs – Wave propagation, transmission and absorption / 42.25.Gy – Edge and boundary effects; reflection and refraction
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000