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Bound states in the continuum (BIC) are highly confined, nonradiative modesthat can exist in open structures, despite their potential compatibility andcoupling with the radiation spectrum, and may give rise to resonances witharbitrarily large lifetimes. Here, we study this phenomenon in layeredmaterials featuring epsilon-near-zero constituents. Specifically, we outline asystematic procedure to synthesize quasi-BIC resonances at given frequency,incidence angle and polarization, and investigate the role of certain criticalparameters in establishing the quality factor of the resonances. Moreover, wealso provide an insightful phenomenological interpretation in terms of therecently introduced concept of "photonic doping", and study the effects of theunavoidable material loss and dispersion. Our results indicate the possibilityto synthesize sharp resonances, for both transversely magnetic and electricpolarizations, which are of potential interest for a variety of nanophotonicsscenarios, including light trapping, optical sensing and thermal radiation.

Synthesizing quasi-bound states in the continuum in epsilon-near-zero layered materials