COVID-19 Detection Using Contemporary Biosensors and Machine Learning Approach: A Review.

The current global pandemic not only claims countless human lives but also rocks the economies of every country on the planet. This fact needs the development of novel, productive, and efficient techniques to detect the SARS-CoV-2 virus. This review article discusses the current state of SARS-CoV-2 virus detection methods such as electrochemical, fluorescent, and electronic, etc.

D-shaped fiber optic plasmonic sensors using planar and grating structures of silver and gold: design and analysis.

In this paper, a D-shaped optical fiber plasmonic sensor using planar and grating structures of silver and gold metals is simulated using the finite element method under the wave optics module of COMSOL Multiphysics. Performance defining parameters are based on (i) the transmittance curve, viz., resonance wavelength ( ), shift in resonance wavelength ( ), minimum transmittance ( ), and bandwidth (BW), and (ii) on electric field distribution of a surface plasmon wave, viz.

Novel Bottom-Side Polished PCF-Based Plasmonic Biosensor for Early Detection of Hazardous Cancerous Cells.

This work presents a single-core bowl-shaped bottom-side polished (BSP) photonic crystal fiber (PCF) sensor based on surface plasmon resonance (SPR) concept for the early detection of hazardous cancer cells in human blood, skin, cervical, breast, and adrenal glands. We have studied liquid samples of cancer-affected and healthy samples with their concentrations/refractive indices in the sensing medium. To induce a plasmonic effect in the PCF sensor, the bottom flat section of a silica PCF fiber is coated with a 40nm plasmonic material, such as gold.

Design and analysis of graphene- and germanium-based plasmonic probe with photonic spin Hall effect in THz frequency region for magnetic field and refractive index sensing.

In this work, we analyze the design of a graphene- and germanium-based plasmonic sensor with photonic spin Hall effect (PSHE) for detection of refractive index (RI) of a gas medium and magnetic field (B) applied to the graphene monolayer in THz frequency region. The PSHE phenomenon is studied in both conventional as well as modified weak measurements. The effect of gaseous medium thickness (d), transverse magnetic (TM) mode's order, and amplified angle parameter (Δ) is studied on the sensor's performance.

Plasmonics-based gas sensor with photonic spin hall effect in broad terahertz frequency range under variable chemical potential of graphene.

Unlabelled: Graphene monolayer of sub-nanometer thickness possesses strong metallic and plasmonic behavior in a broad terahertz (THz) frequency range. This plasmonic effect can be considerably manipulated when graphene layer is subjected to a variable chemical potential (E) via chemical doping or electrical gating. The strong adsorption characteristics of graphene layer is another important advantage.

Design and Analysis of an SPR Sensor Based on Antimonene and Platinum for the Detection of Formalin.

Detection of formalin to prevent food adulteration, especially in tropical countries, is of primary concern for public health issues. Life-threatening diseases such as leukaemia and lymphoma occur due to the regular consumption of formalin with food. Traditionally, spectrophotometry and chromatography-based sensors have been employed to detect formalin, which have limitations related to their ability to achieve high sensitivity, selectivity, and fast response.

Graphene-Based Plasmonic Sensor at THz Frequency with Photonic Spin Hall Effect Assisted by Magneto-optic Phenomenon.

Graphene monolayer of sub-nanometer thickness shows strong metallic and plasmonic behavior in terahertz (THz) frequency range. This plasmonic effect varies considerably when graphene layer is placed under a magnetic field of appropriate strength. The strong adsorption characteristic of graphene layer is another advantage.

A nanolayered structure for sensitive detection of hemoglobin concentration using surface plasmon resonance.

The objective of the proposed work is to design a biosensor that monitors hemoglobin (Hb) concentration using the combination of nanolayer, i.e., barium titanate (BaTiO) and antimonene based on surface plasmon resonance (SPR) technique.