Mainz 2017 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 53: Poster: Quantum Optics and Photonics III

Q 53.81: Poster

Donnerstag, 9. März 2017, 17:00–19:00, P OG2

Modified dipole-dipole interaction and dissipation in an atomic ensemble near a surface — •Ryan Jones and Beatriz Olmos — School of Physics and Astronomy, The University of Nottingham, University Park, NG7 2RD, United Kingdom

Particularly in the area of imaging, surfaces of different materials and shapes are used to manipulate the electromagnetic field experienced atoms in order to change their spontaneous decay rate. As well as interference effects one can manipulate the system in other ways, for example in a metal the presence of surface plasmon polaritons can also drastically change how the system decays.

Relatively little is known about how surfaces affect systems whose behavior is collective. Such effects, including a coherent dipole-dipole interaction (photon exchange) and collective decay, exist in ensembles of two-level atoms with atomic separations that are much smaller than the transition wavelength. These systems have become increasingly relevant in recent years as developments in atomic cooling and trapping have made them experimentally feasible.

In this work, through a Green's tensor formalism we investigate how collective properties are modified when a cold dense system is placed in proximity to surfaces of different materials. By scanning over a range of parameters, we identify regimes in which the collective behaviors of the system are modified considerably.

These results will be of value to current and future experiments investigating the dipole-dipole interaction, where surface interactions can provide an extra degree of control over the system.