Observation of resonant states in negative refractive photonic crystalsS. Romano, A. C. De Luca, E. De Tommasi, S. Cabrini, I. Rendina and V. MocellaJ. Eur. Opt. Soc.-Rapid Publ., 9 (2014) 14006DOI: https://doi.org/10.2971/jeos.2014.14006