Optical response of a dense gas of moving atoms

T. Peyrot, Yvan R. P. Sortais, Jean‐Jacques Greffet +5 more

Dmitriy V. Kupriyanov, Igor V. Sokolov, Mark D. Havey

Yi Li

At high density, dipole-dipole interactions between the atoms may have a major impact on light propagation in a dense gas. We have developed a classical-electrodynamics simulation to study the cooperative response of a near-resonant gas to light. We take into account the motion of the radiators using classical trajectories, including collisions with the walls of the container and atom-atom collisions, and describe the transition from homogeneously broadened to inhomogeneously broadened phenomenology.

Peter P. Orth, Jörg Evers, Christoph H. Keitel

Current designs for negative index materials are passive, such that they suffer from significant losses that prohibit applications, in particular towards optical frequencies. We predict, based on nonlinear optical Bloch equations, negative refraction with zero absorption in an active, i.e., amplifying, dense gas of atoms. External laser fields are used to tune the medium's electromagnetic response and an additional weak pumping field controls its absorption properties. Metastable Neon is identified as a suitable experimental candidate at infrared frequencies to implement a lossless active negative index material.

Vladilen S Letokhov, Vladimir G. Minogin

Андрій Сіжук, Philip Hemmer