We investigate, theoretically and experimentally, a photonic realization of a Sawtooth lattice. This special lattice exhibits two spectral bands, with one of them experiencing a complete collapse to a highly degenerate flat band for a special set of inter-site coupling constants. We report the observation of different transport regimes, including strong transport inhibition due to the appearance of the non-diffractive flat band. Moreover, we excite localized Shockley surface states residing in the gap between the two linear bands. (C) 2016 Optical Society of America.
Programa ICM, Fondo Nacional de Desarrollo Cientifico y Tecnologico (FONDECYT), Deutsche Forschungsgemeinschaft (DFG), German Ministry of Education and Research (Center for Innovation Competence program)