Simultaneous Generation of Surface Plasmon and Lossy Mode Resonances in the Same Planar Platform

Abstract

A planar waveguide consisting of a coverslip for a microscope glass slide was deposited in one of its two faces with two materials: silver and indium tin oxide (ITO). The incidence of light by the edge of the coverslip permitted the generation of both surface plasmon and lossy mode resonances (SPRs and LMRs) in the same transmission spectrum with a single optical source and detector. This proves the ability of this optical platform to be used as a benchmark for comparing different optical phenomena generated by both metal and dielectric materials, which can be used to progress in the assessment of different sensing technologies. Here the SPR and the LMR were compared in terms of sensitivity to refractive index and figure of merit (FoM), at the same time it was demonstrated that both resonances can operate independently when silver and ITO coated regions are surrounded by different refractive index liquids. The results were supported with numerical results that confirm the experimental ones.

Soft molecularly imprinted nanoparticles with simultaneous lossy mode and surface plasmon multi-resonances for femtomolar sensing of serum transferrin protein

“…The simultaneous generation of LMR and SPR resonances on a same planar platform has been reported by Fuentes et al 27 and further Gaur and colleagues 44 investigated the interplay of these optical phenomena and the dependence of one to another from a theoretical and practical point of view, by studying bilayers of ITO and Ag and trilayers ITO-Ag-ITO, exploring different thicknesses and reporting how the sensitivity varies in the different layer configurations 44 . It resulted that depending on the layer thicknesses one resonance dominates the other 44 .…”

“…Worth of note is the possibility to take advantage of both SPR and LMR and few configurations able to simultaneously excite both phenomena are also reported 27 – 29 . As an example, da Silva et al 29 developed a RI and corrosion sensor which consisted of two cascaded D-shaped sensor regions: the first one exploiting the LMR of a bilayer of titanium dioxide–aluminum and an SPR sensitive area consisting of a bilayer of gold and titanium dioxide.…”

Advances in sensors using lossy mode resonances

“…Due to the simplicity and flexibility of this technology, another strategy that has been used quite successfully has been to hybridize LMR with another technology, whether photonic or not. In the case of planar waveguides, dual LMR/SPR sensors have been obtained by depositing on the same substrate, a metal oxide nanofilm (to generate LMR) and a gold nanofilm to obtain an SPR [36]. Another example hybridizing different technologies is a device based on surface acoustic waves (SAW) successfully combined, in the same sensor head, with another based on LMR, to be able to simultaneously determine the viscosity and refractive index of a fluid, respectively [37].…”

Sensing Approaches Exploiting Molecularly Imprinted Nanoparticles and Lossy Mode Resonance in Polymer Optical Fibers

“…However, a wider range of materials with peculiar optical properties (such as metal oxides, high refractive index polymers, etc.) can excite the LMR phenomenon [ 21 ]. In [ 20 ], the proposed probe exploits the combination of two metal oxides, i.e., zirconium oxide (ZrO 2 ) and titanium oxide (TiO 2 ), deposited on a modified POF.…”