Two-photon light absorption by atoms near the body surface with spectral features
Gennadiy Nikolaev, Oleg Uuemaa
Two-photon light absorption by an atom situated near to surface of a solid with spectral features in the vicinity of resonance frequencies of transitions of atoms is theoretically investigated. These features can be caused, for example, polariton or exiton resonance of a solid. It is shown, that the two-photon light absorption an atom situated near to surface can essentially differ from those in a free space. The spectrum of a two-photon absorption becomes asymmetric over the difference between exciting light frequency and resonant transition frequency of the atom. It is established, that even small spectral features of solid can give rise to significant changes of a spectrum of a two-photon absorption of light. It is established also, that such changes of a spectrum of a two- photon absorption of light are nonlinear increased with increase of the intensity of the exciting light and with approach of the atom to the surface of solid.
Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Oct 21, 1998•0 citations