Abstract

We present an analytical proof of the existence of unidirectional optical Bloch oscillations in a waveguide array system. It is shown that the presence of nonreciprocity in the system allows for a complete normal-mode dephasing in one of the propagation directions, resulting in a unidirectional breakdown in Bloch oscillations. A model system consisting of an array of transversely magnetized asymmetric $\mathrm{Si}/{\mathrm{SiO}}_2$ waveguides with a magneto-optic cover layer is presented. Large index contrasts between film and cover are critical for practical realizations.

© 2011 Optical Society of America

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