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arXiv · 2508.08534

Observation of multi-orbital Fano resonances in photonic lattices

Diego Guzmán-Silva·Maritza Ahumada·Polette Parra-Palavecino·Alexis R. Legón·Pedro A. Orellana·Rodrigo A. Vicencio
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Abstract

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 article, we introduce a quantum simulator designed to observe multi-orbital Fano resonances using a photonic waveguide analog. The system consists of a homogeneous lattice, which includes a plane wave generator, and an atom-like 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 atom-like impurity, which works as an efficient energy valve.

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Diego Guzmán-Silva, Maritza Ahumada, Polette Parra-Palavecino, Alexis R. Legón, Pedro A. Orellana, Rodrigo A. Vicencio. 2025-08-12. Observation of multi-orbital Fano resonances in photonic lattices. https://arxiv.org/abs/2508.08534

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