An Interplay between Lossy Mode Resonance and Surface Plasmon Resonance and Their Sensing Applications

Abstract

Conducting metal oxide (CMO) supports lossy mode resonance (LMR) at the CMO-dielectric interface, whereas surface plasmon resonance (SPR) occurs at the typical plasmonic metal-dielectric interface. The present study investigates these resonances in the bi-layer (ITO + Ag) and tri-layer (ITO + Ag + ITO) geometries in the Kretschmann configuration of excitation. It has been found that depending upon the layer thicknesses one resonance dominates the other. In particular, in the tri-layer configuration of ITO + Ag + ITO, the effect of the thickness variation of the sandwiched Ag layer is explored and a resonance, insensitive to the change in the sensing medium refractive index (RI), has been reported. Further, the two kinds of RI sensing probes and the supported resonances have been characterized and compared in terms of sensitivity, detection accuracy and figure of merit. These studies will not only be helpful in gaining a better understanding of underlying physics but may also lead to the realization of biochemical sensing devices with a wider spectral range.

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 .…”

“…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 . In the present work, it was demonstrated that a POF modified with bilayers of ZrO 2 –TiO 2 or TiO 2 –ZrO 2 and followed by a gold layer 30 , provided LMR and SPR and can be used in combination with highly selective, soft nanoMIPs to develop a new, cheap and ultralow sensitive sensing platform.…”

Road Map of Semiconductor Metal-Oxide-Based Sensors: A Review

“…Adding dopants, impurities, composite structures, or metal additives can further manipulate the charge transfer in a SMOx. In addition to improving the long-term stability and selectivity, these components lower the operation temperature, energy consumption, and humidity interference of pristine SMOx [ 19 , 20 , 21 , 22 , 23 ]. There are two types of SMOx materials: n-type and p-type, depending on the type of dopants.…”

“…As a result of their tunable sensitivity, selectivity, and response time, SMOx-based materials are widely used in sensors that detect gases, chemicals, and biomolecules. With SMOx-based sensors, a wide range of gases can be detected, such as oxidizing gases and reducing gases [ 17 , 23 ].…”

Plasmonic Sensors: A New Frontier in Nanotechnology

“…Gaur et al investigated the interplay between SPR and lossy mode resonance (LMR) in this Special Issue. They compared these two types of sensing techniques in terms of sensitivity, detection accuracy, and figure of merit [ 23 ]. The SPR effect is a complicated physical phenomenon that occurs when light strikes a conductive layer of noble metal.…”