This work reports on a computational analysis of how a modified perovskite cell can work as\na refractometric sensor by generating surface plasmon resonances at its front surface. Metal-dielectric\ninterfaces are necessary to excite plasmonic resonances. However, if the transparent conductor\n(ITO) is replaced by a uniform metal layer, the optical absorption at the active layer decreases\nsignificantly. This absorption enhances again when the front metallic surface is nanostructured,\nadding a periodic extruded array of high aspect-ratio dielectric pyramids. This relief excites surface\nplasmon resonances through a grating coupling mechanism with the metal surface. Our design\nallows a selective absorption in the active layer of the cell with a spectral response narrower than\n1 nm. The photo-current generated by the cells becomes the signal of the sensor. The device employs\nan opto-electronic interrogation method, instead of the well-known spectral acquisition scheme.\nThe sensitivity and figure of merit (FOM) parameters applicable to refractometric sensors were\nadapted to this new situation. The design has been customized to sense variations in the index of\nrefraction of air between 1.0 and 1.1. .................................
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