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We propose a novel geometry for integrated photonic devices that can be usedas isolators and polarization splitters based on engineered photonic lattices.Starting from optical waveguide arrays that mimic Fock space representation ofa non-interacting two-site Bose Hubbard Hamiltonian, we show that introducingmagneto-optic nonreciprocity to these structures leads to a superior opticalisolation performance. In the forward propagation direction, an input TMpolarized beam experiences a perfect state transfer between the input andoutput waveguide channels while surface Bloch oscillations block the backwardtransmission between the same ports. Our analysis indicates a large isolationratio of 75 dB after a propagation distance of 8 mm inside seven coupledwaveguides. Moreover, we demonstrate that, a judicious choice of thenonreciprocity in this same geometry can lead to perfect polarizationsplitting.

On-chip non-reciprocal optical devices based on quantum inspired photonic lattices