2000 character limit reached
Observation of a localized flat-band state in a photonic Lieb lattice (1412.6342v3)
Published 19 Dec 2014 in physics.optics and cond-mat.quant-gas
Abstract: We show experimentally how a non-diffracting state can be excited in a photonic Lieb lattice. This lattice supports three energy bands, including a perfectly flat middle band, which corresponds to an infinite effective mass with zero dispersion. We show that a suitable optical input state can be prepared so as to only excite the flat band. We analyse, both experimentally and theoretically, the evolution of such photonic flat-band states, and show their remarkable robustness, even in the presence of disorder.