Fano resonances are a fundamental physical phenomenon that occurs when an open channel couples with a closed one, resulting in a resonant cancellation of transmission. In this Letter, we introduce a photonic waveguide device designed to observe multiorbital Fano resonances. The system consists of a homogeneous lattice, which includes a plane-wave generator, and an atomlike impurity that supports first-order ($S$) and second-order ($P$) modes. We derive a two-impurity Fano-Anderson model to describe this system and fit the experimental results accordingly, demonstrating a remarkable agreement between our experimental measurements and theoretical predictions. A comprehensive experimental characterization reveals clear double resonances for the $S$ and $P$ states, which depend on the properties of the atom and the excitation wavelength. Our results illustrate how the transport of a propagating beam on a lattice can be effectively controlled by simply adjusting the properties of a single external atomlike impurity, which works as an efficient energy valve.

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• Photonics
• Waveguide arrays