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Title: Critical features of nonlinear optical isolators for improved nonreciprocity.
Authors: Roy, Dibyendu
Issue Date: Sep-2017
Publisher: American Physical Society
Citation: Physical Review A, 2017 Vol.96, p033838
Abstract: Light propagation in a nonlinear optical medium is nonreciprocal for spatially asymmetric linear permittivity. We examine the physical mechanism and properties of such nonreciprocity (NR). For this, we calculate the transmission of light through two models of a nonlinear optical isolator consisting of (a) a two-level atom and (b) a driven Λ-type three-level atom coupled asymmetrically to light inside open waveguides. We find a higher NR in the model (b) than in the model (a) due to a stronger optical nonlinearity in the former. We determine the critical intensity of incident light for maximum NR and a dependence of the corresponding NR on asymmetry in the coupling. Surprisingly, we find that it is mainly coherent elastic scattering compared to incoherent scattering of incident light which causes maximum NR near the critical intensity. We also show a higher NR of an incident light in the presence of an additional weak light at the opposite port.
Description: Open Access
ISSN: 2469-9934 (online)
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Copyright: 2017 American Physical Society
Appears in Collections:Research Papers (TP)

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