Designing highly sensitive exposed core surface plasmon resonance biosensors

Abstract

With technological advancement, photonic crystal fibers (PCFs) are effectively used to design miniaturized, flexible, and efficient biosensors. This paper proposes an exposed core PCF biosensor based on widely known surface plasmon resonance (SPR) phenomena. An external sensing mechanism is followed to characterize the sensing performance within the refractive index (RI) range between 1.28 and 1.40. Metal strip (gold (Au) and titanium dioxide (TiO2)) is deposited on the outer surface only along the four channels instead of the entire surface, which could decrease the difficulties associated with the metal deposition on the entire circular surface. Simulating the sensor using finite element method based COMSOL Multiphysics software, we find tremendous amplitude sensitivity of 7420.69 RIU−1 and wavelength sensitivity of 87,000 nm/RIU. In addition, the sensor offers the highest resolution of 7.7×10−6 RIU, the figure of merit of 1011.63 RIU−1, signal to noise ratio of 10.05 dB, the detection accuracy of 0.016598 nm−1, and detection limit of 102.23 nm. However, the promising sensing performance indicates that the proposed sensor could be implemented effectively to detect different biological and chemical substances.

Numerical Investigation of Photonic Crystal Fiber-Based Biosensor for Pathogens Detection in Water

“…3 illustrates the confinement losses of pure and contaminated water due to Vibrio Cholera (RI: 1.365), E. Coli (RI: 1.388), Bacillus Anthracis (RI: 1.3833), and Enterococcus Faecalis (RI: 1.3921), respectively [18,41]. The RI of pure water changes to 1.365, 1.388, 1.3833, and 1.3921 for the presence of single bacterium (one molecule) Vibrio Cholera, E. Coli, Bacillus Anthracis, and Enterococcus Faecalis, respectively [41][42][43]. The confinement loss of 0.63369 dB/cm and the resonant wavelength at 1.43 μm for the pure water are observed by the red curve as shown in Fig.…”

Recent Progress in Spectroscopic Methods for the Detection of Foodborne Pathogenic Bacteria

“…The simulation results showed higher amplitude sensitivity of 7420.69 RIU −1 and wavelength sensitivity of 87,000 nm/RIU. The given technique requires real-time implementation for the detection of different biological materials [ 58 ]. The surface plasmon resonance imaging enabled crossed surface relief gratings utilized for the rapid and label-free detection of E. coli .…”

Improving Temperature-Sensing Performance of Photonic Crystal Fiber via External Metal-Coated Trapezoidal-Shaped Surface

“…Researchers have designed various SPR sensors using the unique property of SPR [22]; for example, waveguide or fiberbased RI sensors such as prism-coupling SPR sensors [23,24], metal-insulator-metal (MIM) waveguide-based sensors, a periodic array of rod-shaped plasmonic sensors [10,25], fiber Bragg gratings [26,27], microring resonators, and plasmonic PCF sensors [26]. SPR biosensors can detect biological samples near the metal surface using the resonance mechanism [28]. The SPR-PCF sensor utilizes the core-guided and SPP modes when in the phase-matching condition [29].…”