Key points are not available for this paper at this time.
Surface impedance of a photonic material governs how an impinging light wave behaves at its surface, whereas its bulk ``band structure'' determines what wave modes can propagate in it. Is there a surface-to-bulk correspondence? A new study of one-dimensional photonic crystals indeed uncovers a rigorous fundamental relationship between the two.
Xiao et al. (Fri,) studied this question.