Extended Data Fig. 2: Leaky photonic lattice design for silicon photonics.
From: Probing bulk topological invariants using leaky photonic lattices
(a) Schematic of a dimerized array of 10 silicon waveguides with labelled dimensions. Trivial and nontrivial arrangements differ by the intersite gaps ordering: g1 > g2 (trivial), g1 < g2 (nontrivial). (b,c) Field profiles of eigenmodes from the upper (b, neff = 1.8154) and lower bands (c, neff = 1.6735 − 0.0014i) in the trivial array. (d) Power and (e,f) Zak phase obtained from the field projection operator summed over excitations of the 5th and 6th waveguides in the trivial (e, blue curves) and nontrivial (f, gold curves) arrays. For comparison, grey curves in (e,f) show the Zak phase estimated from the single 5th waveguide excitation.
