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We present the study of bound surface modes sustained at the termination oftruncated bulk dielectric photonic crystals and isolated metasurfaces ofdielectric meta-atoms. We discuss the origins of bound modes in the two systemsand their relation. For both systems, we theoretically study and experimentallydemonstrate wavefront manipulation, in particular directional emission,frequency splitting and beam collimation achieved by coupling of the boundstates to radiation modes through leaky wave radiation mechanism using properlydesigned scattering gratings.

Wavefront manipulation based of the excitation of bound states in dielectric photonic crystals and bilayer metasurfaces