Young'S Double-Slit-Like Diffraction Stemming From Scattering Of Long-Ranged Surface Plasmon Polaritons Along Distinct +/- Z-Faces' Metallic Layers In Indium-Tin-Oxide Coated Fe Doped Linbo3

Young's double-slit-like diffraction was seen on a viewing screen placed perpendicularly to a sharply cut edge of a Z-cut iron doped LiNbO3 (LN) slab coated with indium-tin-oxide (ITO) films. The high contrast fringes observed confirm two sets of visible long-ranged surface plasmon polaritons propagating along the two ITO-LN interfaces distinctly over 5 mm path length with well-kept coherency, apart from metal uses. The indices of refraction measured with polarimetry from the +/- Z-faces and changing transmission spectra obtained are consistent with the physical picture, along with dynamics of the very first reflection from the -Z-face under varying polarization angles between the two incident laser beams onto the slab. (C) 2020 Optical Society of America