We introduce the concept of a resonant tunneling photonic nanotriode that makes possible the mutual control of cross-cut light flows. The idea of this concept is based on the strong resonant interaction between the nearly phase-matched quasi-localized eigenmode of nonlinear planar dielectric waveguides and incident beams. We demonstrate that by means of variation of input guided wave intensities even small nonlinear phase mismatches may switch the bistable system from one equilibrium state to another and back, resulting in deep modulation of beam reflection and transmission coefficients due to the exchange between trapped and free photons. The suggested nanosize device can also serve as light amplifier, light modulator, controlled coupler, light flows divider, etc.
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