Coordinated Tuning of Graphene’s Chemical Potential With NIR Wavelength and Temperature Under Kubo Framework for Enhanced Performance of SPR-Based Chemical Sensor

摘要

The performance of a Kretschmann configuration-based surface plasmon resonance sensor with fluoride glass prism, Ag layer, and graphene monolayer is simulated and analyzed under the coordinated tuning of temperature (293-373 K), near infrared (NIR) wavelength (1310-1700 nm), and graphene's chemical potential (0-1 eV). The simulation is carried out by considering the graphene's conductivity variations with wavelength, temperature, and chemical potential (As per Kubo formulation). For Ag layer, the phenomena of phonon-electron scattering and electron-electron scattering are taken into account. Thermo-optic effect in dielectric media (ZBLAN prism and analyte samples, i.e., methanol and ethanol) is also considered. The simulation results indicate that a combination of shorter NIR wavelength, higher temperature, and larger chemical potential can provide considerably enhanced performance. A deeper analysis predicts that 1310 nm wavelength, greater than 0.6 eV chemical potential, and 325-330 K temperature can be used as a pragmatic combination in order to achieve significantly enhanced sensing performance.