  It is shown that reciprocity of the optical path can be violated through
asymmetric strength coupling via near-field from resonant Mie scatterers to
total internal reflection modes in a dielectric slab. Numerical simulations for
silicon nanospheres separated by a nanogap from the glass substrate reveal that
at least two orders of magnitude rectification ratio can be realized for such
an optical diode configuration. Implementation to a solar light harvesting
device, a scattering solar concentrator, is discussed, indicating a similar
efficiency is achievable as for the state-of-the-art devices based on
luminescence.
