Refractive index sensor based on plasmonic D-shaped photonic crystal fiber with pyramid grating

Abstract

In this work, highly sensitive D-shaped photonic crystal fiber (PCF) sensor with plasmonic pyramid grating is introduced and analyzed. The sensing mechanism depends on the coupling between the fundamental core mode and the surface plasmon mode around the plasmonic pyramid grating. The resonance frequency depends on the analyte refractive index (RI) which can be employed to detect the analyte RI changes. The geometrical parameters of the proposed PCF and gold pyramid grating are studied to enhance the RI sensor sensitivity. The simulation results are obtained using full vectorial finite element method. The suggested sensor has higher sensitivity of 5200 nm/RIU than 3340 nm/RIU of the conventional grating design through the studied RI range from 1.355 to 1.385. Therefore, the reported RI sensor can be used for basal cancer cell detection with normal and cancerous cells’ refractive indices of 1.36 and 1.38, respectively. Additionally, linear performance is achieved using the reported design.

Design and analysis of D-shaped fiber optic plasmonic sensors using triangular corrugation of silver: transmittance and field analysis

“…Metal's structure in D-shape fiber optic sensor Sensitivity (nm/RIU) Kumar et al 2023 [31] Ag planar 6000 Ag grating 6100 Nagat Elmahdy et al 2022 [43] Au triangular grating 5200 Riadh Kadhim et al 2020 [26] Ag+∝-Fe 2 O 3 Grating 6400 Pathak and Singh 2020 [44] Planar Ag strip 2100-3240 Tulika Khanikar et al 2019 [24] Au Grating 7590 Proposed work Ag triangular corrugation 10200 the proposed sensor is 10.2 μm RIU −1 . It is seen that the sensitivity of the proposed sensor is highest among all.…”

Role of presence of gold nanoparticles on enhancement of RF biosensing sensitivity

“…There is a need to look for modalities that will enable easy detection of minute concentrations of samples. To this extent, this work explores the use of plasmonic particles [32][33][34], particularly gold nanoparticles, in enhancing the detection sensitivity.…”