Potential of SPR sensors based on multilayer interfaces with gold and LHM for biosensing applications

Abstract

Recently, the subject on "plasmonics'' has received significant attention in designing surface plasmon resonance (SPR) sensors. In order to achieve extremely high-sensitivity sensing, multilayered configurations based on a variety of active materials and dielectrics have been exploited. In this work, a novel SPR sensor is proposed and investigated theoretically. The structure, analyzed in attenuated total reflection (ATR), consists of multilayer interfaces between gold and a metamaterial (LHM) separated by an analyte layer as a sensing medium. By interchanging between gold and LHM, under the effect of the refractive index (RI) of analyte set to be in the range of 1.00 to 1.99, the sharp peak reflectivity at the SPR angle takes two opposite behaviors predicted from the transfer matrix method. At the threshold value of 1.568 of the refractive index of analyte and when the LHM is the outer medium, the layered structure exhibits a giant sharp peak located at 43° of intensity up to 10 5 due to the Goos-Hànchen effect. With respect to the refractive index (RI) change and thickness of analyte, the characteristics (intensity, resonance condition, and quality factor) of the SPR mode, which make the proposed device have the potential for biosensing applications, have been analytically modelized.

Nano-layered surface plasmon resonance-based highly sensitive biosensor for virus detection: A theoretical approach to detect SARS-CoV-2

“…Thus, the BK7 prism was chosen for this proposed sensor. Due to these characteristics of the BK7 prism, it was used in many previous studies ( Cherifi and Bouhafs, 2017 ; Tran et al , 2017 ; and Prabowo et al , 2017 ).…”

“…Thus, this virus detection scheme requires a lengthy procedure. Many other previous studies proposed a multilayered (e.g., gold and metamaterials) SPR-based biosensor ( Cherifi and Bouhafs, 2017 ). However, this was not used for virus detection.…”

Analysis of Coupled Surface Plasmon in LHM Mediated Dielectric Gap Multilayer Structure

“…2. This interfacial response is calculated from the transfer matrix method (TMM) which was previously detailed elsewhere [22]. The formalism of TMM, applied to the proposed SPR nanocavity with a prism-coupler, is repeated in the appendix section of the paper.…”

“…Szunerits et al [6] who also employed other strategies, succeeded in designing highly sensitive SPR sensors. Generally, in the design of SPR sensors, the sensing properties may be tuned in different limits that depend mainly on the whole of the parameters of involved active materials and the surrounding dielectrics [20][21][22][23][24]. In order to further improve the relative sensitivity, Ouyang et al [25] used the advantages of stacking Si/MoS 2 under the Au layer exhibiting a single SPR mode whose full width at half maximum (FWHM) termed, dq 0.5 at 50 % of reflectivity, is significantly wider when increasing the number of MoS 2 layers.…”

Abrupt phase change in graphene-gold spr-based biosensor

“…Each medium is subscribed by a thickness d k , permittivity ò k and permeability μ k . The total reflectivity of the system is calculated based on Fresnel theory which for mulitilayer structure can be developed using transfer matrix method [27]. According to this method, the reflectance coefficient for p-polarized light can be given as follows:…”