Design of graphene metasurface based sensitive infrared biosensor

• Published in: Sensors and actuators. A. Physical. Vol. 301; p. 111767
• Main Authors: Patel, Shobhit K., Parmar, Juveriya, Kosta, Yogeshwar P., Ladumor, Mayurkumar, Zakaria, Rozalina, Nguyen, Truong Khang, Dhasarathan, Vigneswaran
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.01.2020; Elsevier BV
• Subjects: Absorption; Biomolecules; Biosensor; Biosensors; Blood plasma; Cables; Electric fields; Graphene; Infrared; Leaky waves; Metasurface; Metasurfaces; Molecules; Physical properties; Plasma; Reflectance; Sensitive; Sensitivity; Silicon dioxide; Silicon nitride; Metasurface; Sensitive; Infrared; Graphene; Biosensor
• ISSN: 0924-4247; 1873-3069
• DOI: 10.1016/j.sna.2019.111767

[Display omitted] •The sensing principle of the proposed design is obtained by applying the blood plasma over the Si3N4 waveguide.•The sensitivity is calculated by inferring the shift presence in the plotted reflectance and absorption spectrum.•The sensitivity is also tuned using waveguide height (S), SiO2 layer height (C) and graphene perturbations period (G). The article investigates graphene metasurface based infrared biosensor. Graphene metasurface perturbations are added in the Si3N4 waveguide to create leaky wave structure. Biomolecules in blood plasma form are placed over the Si3N4 waveguide to observe the sensing characteristics. Numerical results of absorption, reflectance, electric field and sensitivity are presented in this paper. The sensitivity is calculated from the shift in the absorption peak of biosensor. The sensitivity of the proposed biosensor is also compared with the previously published biosensor designs. In addition, the design results in the form of absorption and reflectance is observed for the different physical parameters like waveguide height (S), biomolecules/air layer height(B), SiO2 layer height(C) and graphene perturbations period(G). The corresponding electric field response is also presented for the proposed design at different frequencies to show the leakage of light in the biomolecules layer.