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We demonstrate experimentally a new type of Bound state In the Continuum(BIC) which is induced by the vertical symmetry breaking of a photonic crystalslab. Such BIC emerges from the hybridization between Bloch resonances ofopposite parities once the vertical symmetry is broken, and is observed in thevicinity of the anticrossing point at the lower hybrid band of theenergy-momentum diagram. All experimental results are nicely reproduced bynumerical simulations, and in good agreement with an analytical model based onFriedrich-Wintgen framework. Together with the possibility of dispersionengineering by vertical symmetry breaking, our results open the way to tailorphotonic states in the entire complex plane to study non-hermitian photonics.

Realization of Bound state In the Continuum induced by vertical symmetry breaking in photonic lattice