Abstract
A photonic analog of Klein tunneling for a relativistic electron across a potential step, based on spatial light propagation in an engineered binary waveguide array, is proposed. Klein tunneling can be simply visualized as optical beam refraction through a step-index interface, superimposed to the superlattice, and explained as an interband tunneling process between positive-energy (electron) and negative-energy (positron) minibands of the superlattice. Inhibition of Klein tunneling for a smooth potential step is also demonstrated.
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