The identification of the surface dominant effect based on visible surface plasmons (SPs) shed new light on the strong energy coupling reported in conventional photorefractive works which mistakenly attribute the strong scattering (fanning) effect solely to the surface unevenness in the past. The root cause for visible SPs involvement, surface metallization, was dealt with in Fe doped LiNbO3 crystals with density functional theory, which can be readily generalized into more general picture regarding ferroelectric oxides. To prove that these material systems are promising for chemical and biological applications, salt water was used as the surrounding medium for bare LN slabs, finding ease in the formation of the 2D patterns, unveiling that the doping dipole states are increased remarkably. To confirm convincingly the surface dominant effect is indeed responsible for strong effect in ferroelectric oxide, truly bulk (2.0 and 11.5 mm thick) Fe doped LN samples were prepared and the key feature, 2D diffraction patterns, was observed. The reason behind the ITO coating in strengthening 2D diffraction and scattering was clearly attributed to mitigation (if not complete elimination) of doping dipole state originally formed on the surfaces with adsorbed ions. The border enhancement of the diffraction spots observed was also explained with the physical picture of grating mediated SPs’ energy coupling. This work leads a way towards making visible plasmonic material with totally non conducting ferroelectric and other highly polar materials.