Abstract

Young’s double-slit-like diffraction was seen on a viewing screen placed perpendicularly to a sharply cut edge of a ${\rm Z}$-cut iron doped ${{\rm LiNbO}_3}$ (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 $\pm {\rm Z}$-faces and changing transmission spectra obtained are consistent with the physical picture, along with dynamics of the very first reflection from the ${-}{\rm Z}$-face under varying polarization angles between the two incident laser beams onto the slab.

© 2020 Optical Society of America

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