All-optical half-adder based on photonic mode junction

We investigate the operation of all-optical multi-junction half-adder built upon photonic mode-orthogonal hetero-structures. Controlling the dielectric potential of multi-junctions (Ψ_e-Ψ_e-o-Ψ_o), the flow of photons from Ψ_e-o region can be abruptly manipulated to Ψ_e or Ψ_o region in self-induced manner. With exceptional performance metrics, all-optical logic operations for half-adder are successfully derived with the bi-level dynamic mode-conversion across the junction.