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Optics Communications

Recoil-induced effects in passive and active atomic systems

R. Bonifacio, Brian W J McNeil, N. Piovella, Gordon R. M. Robb

Published May 1, 2000• 2 citations
Publisher
DOI
10.1016/s0030-4018(99)00544-1

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We introduce two models of quasidiscrete optical systems: an array of waveguides doped by four-level NNN-type atoms, and a nonlinear checkerboard pattern, formed by doping with three-level atoms of the $\ensuremath{\Lambda}$-type. The dopant atoms are driven by external fields, to induce the effect of the electromagnetically induced transparency (EIT). These active systems offer advantages and additional degrees of freedom, in comparison with ordinary passive waveguiding systems. In the array of active waveguides, the driving field may adjust linear and nonlinear propagation regimes for a probe signal. The nonlinear checkerboard system supports the transmission of stable spatial solitons and their ``fuzzy'' counterparts, straight or oblique.