Design and Analytical Evaluation of a High Resistance Sensitivity Bolometer Sensor Based on Plasmonic Metasurface Structure

The bolometric effect (BE) allows to electrically monitor spectral characteristics of plasmonic sensors, but trade-off between sensitivity, response time, and strong light absorption is an important challenge. Here, the BE for a high resistance sensitivity plasmonic sensor is proposed and studied based on plasmonic multilayer structure at 26 °C. By generating strong coupling between incident wave and surface plasmon polaritons (SPPs), a very narrow absorption spectra with high figure of merit (FoM) is achieved, that heats the silver thin film, leads to variation in temperature and supports TE surface mode. The temperature variation rectifies the resistance of the metal thin film by the BE. Optical characteristics of the proposed metasurface bolometer sensor (MBS), are calculated by TMM and 3D-FDTD, in that maximum quality factor is 17.2 RIU
^-1
, sensitivity is 530 and FoM is 434.5. Finally, we analytically simulate the temperature coefficient of resistance in terms of wavelength and refractive index of analyte that can be monitored by an external electric model. The proposed thermal, optical, and electric plasmonic MBS can be used in biophysics, biology, and environmental science because of its very compact footprint with high resistance sensitivity and FoM in comparison with any previous reports.