Unidirectional optical Bloch oscillations in asymmetric waveguide arrays
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 Si=SiO2 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.
Unidirectional optical Bloch oscillations in asymmetric waveguide arrays.
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