1210.8132 (Dibyendu Roy)

Two-photon scattering of a tightly focused weak light beam from a small
atomic ensemble    [PDF]

Dibyendu Roy

We study two-photon scattering of a tightly focused weak light beam from a small atomic ensemble of two-level atoms (2LAs). The scaling of the two-photon nonlinearity at single photon resonance shows a non-monotonic behaviour with increasing number of few identical 2LAs. Single-photon transport in a system of two 2LAs is similar to that in a $V-$type three-level atom (3LA). However, two-photon transport in these two systems shows very different line-shapes. When the single-photon transmission is zero in these systems, two transmitted photons are bunched together in a $V-$type 3LA, while their correlation is zero in two 2LAs. The difference in the two-photon line-shape persists for few 2LAs and 3LAs. Therefore, the two-photon scattering of a tightly focused weak light beam can be used as a probe to detect atomic level structures of different atoms with similar transition energies.

View original: http://arxiv.org/abs/1210.8132