Abstract
The control of scattering light direction by incident spin state offers a desirable and novel development opportunity for the nano optics and integrated optical devices. Here, the controllable propagation of light in multi-channel metal waveguide is investigated by analyzing and applying the symmetry between the light source and the system based on the component wave interference theory. The composite electric and magnetic dipoles are used to drive the selective scattering in a four-channel structure. We found that it is a very convenient and intuitive method to obtain the selective propagation direction by considering the symmetry. We also reveal that the spin-momentum locking is only the eigen property of the optical system, instead of the origin of unidirectionality.
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