Periodic structures 12 Diffraction gratings 6 High-energy range 6 Silicate minerals 6 A-plane 4 Artificial opals 4 Compound structures 4 Experimental confirmation 4 Front face 4 Incident fields 4 Korringa-Kohn-Rostoker method 4 Lattice resonances 4 Near field scanning optical microscopy 4 Near-field pattern 4 Near-field scanning optical microscope 4 Optical correlation 4 Optical intensities 4 Optical response 4 Outer surface 4 Periodic arrays 4 Rear surfaces 4 Refractive index 4 Resonance 4 Scanning near-field optical microscopy 4 Three dimensional periodic structure 4 Transmission mode 4 Wire 4 Backscattering reduction 2 Circular cross-sections 2 Circular cylinders 2