Multi-band MIM refractive index biosensor based on Ag-air grating with equivalent circuit and T-matrix methods in near-infrared region

Abstract

In this paper, a multi-band metal-insulator-metal (MIM) perfect absorber with refractive index sensing capability has been investigated in near-infrared region. The proposed structure has been studied for biomedical applications such as detection of solution of glucose in water, diagnosis of different stages of malaria infection, bacillus bacteria and cancer cells. The MIM configuration improves the sensing parameters of the biosensor due to the good interaction with the analyte. The high sensitivity and figure of merit of 2000 nm/RIU and 100 RIU−1 have been achieved, respectively. Also, the Ag-air grating in the suggested plasmonic sensor helps the localized surface plasmons excitation and makes the structure sensitive to the incident lightwave polarization. Therefore, the presented biosensor behaves like a polarization switch with the high extinction ratio and fast response time of 25.15 dB and 100 fs, respectively. The methods of equivalent circuit model and transmission matrix have been utilized to verify the simulation results, as a new challenge in near-infrared region. The new idea of multi-application plasmonic devices, the feasibility of fabrication for the presented structure and utilizing mentioned analytical methods in near-infrared region could pave the way for the future of plasmonic structures.

A Nanoscale Structure Based on an MIM Waveguide Coupled with a Q Resonator for Monitoring Trace Element Concentration in the Human Body

“…The S value at this point is 2260 nm/RIU. Its performance was better than most of the parameters in Table 1 [28][29][30][31]. If the angle changes and the structure changes, will there be different propagation characteristics?…”

“…The S value at this point is 2260 nm/RIU. Its performance was better than most of the parameters in Table 1 [28][29][30][31]. Subsequently, we studied the effect of geometric parameters L and H on system performance.…”

State-of-the-Art Optical Devices for Biomedical Sensing Applications—A Review

“…Recently, we presented several RI plasmonic sensor designs based on SPP waves to effectively use them in biomedical applications [17,37,[135][136][137][138][139][140][141][142]. There were several other biomedical applications, such as photothermal therapy [143,144], blood group detection [145,146], glucose sensing [147,148], cancer cells [147], bacillus bacteria [147] that were also studied based on MIM WG configuration. Figure 9a-f shows unique sensor designs proposed by different researchers for RI sensing applications [17,140,[149][150][151][152].…”

Design and analysis of a plasmonic nanostructure applicable for heating and sensing cycles of lab-on-chip

“…To achieve these goals, we propose a plasmonic nanostructure composed of an array of gold porous nanocubes on gold film with a SiO 2 spacer. The use of an insulator (SiO 2 ) between two functional layers increases the coupling between LSP and PSP and this technique is called metal-insulatormetal (MIM) (Wang et al, 2019a(Wang et al, , 2019bChu and Crozier, 2009;Nejat and Nozhat, 2020). When the structure is exposed to plane wave incident light, the LSP and PSP are both excited in this composite structure; LSPs are excited on the surface of porous nanocubes and PSPs are excited on the surface of the gold film, act as plasmonic heaters.…”