Figure of merit enhancement of Ti_3C_2T_x-graphene based long-range surface plasmon sensor at telecommunication wavelength

摘要

In this work, the long-range surface plasmon resonance (LRSPR) sensor based on dielectric Ti_3C_2T_x-graphene layers is demonstrated. Here, MXene (Ti_3C_2T_x) is used as a metal for strong surface plasmon's generation at 1550 nm excitation wavelength. Graphene is used to attach the biomolecules having carbon-carbon structure with pi stacking interactions. The detection accuracy (DA) and figure of merit (FoM) for the proposed LRSPR sensor is theoretically investigated at telecommunication wavelength. The highest FoM of (559.64 RIU~(-1)) is obtained at 3100 nm dielectric thickness and 14 nm Ti_3C_2T_x thickness of the proposed sensor. The maximum improvement in FoM is 273% to the traditional LRSPR sensors. Propagation depths are also evaluated for Au-graphene and proposed LRSPR sensor at 14 and 27 nm thicknesses of Ti_3C_2T_x We believe that the Ti_3C_2T_x can be used in place of metals for strong plasmon generation in future sensor designs at telecommunication wavelengths.