Photonic crystal nanostructure as a photodetector for NaCl solution monitoring: theoretical approach

Abstract

In this research, we have a theoretical simple and highly sensitive sodium chloride (NaCl) sensor based on the excitation of Tamm plasmon resonance through a one-dimensional photonic crystal structure.

High-performance biosensors based on angular plasmonic of a multilayer design: new materials for enhancing sensitivity of one-dimensional designs

“…3 that the presence of an additional dielectric layer in structure-2 enhances the transformation of the incident light, corresponding to TM polarization at the resonance angle into surface plasmons due to the energy reduction associated with resonance dip. 6 This enhancement of surface plasmons can be visualized by observing the decrease in the energy, which is associated with resonance dips, corresponding to the samples of refractive indices 1.33 and 1.34 positioned at resonance angles 77.37° and 79.44°, respectively in the reflectance spectra, as shown in Fig. 3.…”

“…Thus, a little portion of the incident electromagnetic waves is conned through Ag's layer as an evanescent wave. 6 Then, the excitation of SPR is introduced due to coupling between the conned evanescent wave and the surface plasmon resonance as a result of the matching between the wave vector of the incident electromagnetic wave and that of the surface plasmon. [2][3][4][5][6] Interestingly, the resonant dip appears within the reectance spectrum due to the excitation of SPR.…”

“…Interestingly, the dependence of some materials like Graphene, MXene, black phosphorous, blue phosphorous and tungsten disulde have signicant effect on the sensitivity, FoM, quality factor and LoD as well. [2][3][4][5][6]8,[10][11][12][13] Meanwhile, Yupapin et al, have introduced an ASPR sensor based on Si-Graphene layers for the detection of Chikungunya virus. 3 The suggested sensor provides a sensitivity of 393°per RIU.…”

“…7 The coupling between SPWs and the evanescent wave, which results from phase matching, is a requirement for achieving the SPR conditions. 8 The fulllment of this condition results in the resonant dip in the reectance response of the structure [6][7][8] as the excitation of surface waves is not possible directly through a 3D beam. There are different excitation techniques, such as the Kretschmann conguration, in which, a prism is used for the excitation of surface plasmons, Otto conguration, ber coupling, and greeting coupling schemes, which are used by researchers worldwide.…”

“…5 The incident transverse magnetic (TM) electromagnetic wave (EM) of a specific wavelength through the interface of a metal/dielectric slabs induces the free electrons of metal to oscillate collectively, which, in turn, start propagating along the interface due to the energy transfer, which is carried by the incident EM wave to free the electrons of metal surface. 6 This collective propagation of free electrons along the interface between the metal and dielectric is known as surface plasma waves (SPWs). 7 The coupling between SPWs and the evanescent wave, which results from phase matching, is a requirement for achieving the SPR conditions.…”