Document Type : Full length research Paper
Authors
1
Physics department,, Faculty of basic sciences, Salman Farsi University of Kazerun, Kazerun, Iran.
2
Department of Electrical Engineering, Faculty of Engineering, Salman Farsi University of Kazerun, Kazerun, Iran
3
Physics Department, Faculty of Basic Sciences, Salman Farsi University of Kazerun, Kazerun, Iran
Abstract
In this work, a high-performance, polarization-independent metamaterial perfect absorber operating in the microwave regime is introduced and numerically investigated for refractive-index-based sensing applications. The proposed structure is based on a metal–dielectric–metal configuration and incorporates a concentric cut-out double-square double-layered resonator, enabling near-unity absorption at the resonance frequency of 5.489 GHz. The underlying physics behind this perfect absorption behavior is elaborately discussed. Simulation results demonstrate that the proposed sensor exhibits high sensitivity, a large quality factor, and a considerable figure of merit. The maximum sensitivity, quality factor, and figure of merit are found to be 2.3 GHz/RIU, 166, and 48.9, respectively, exceeding those reported for many previously published microwave sensors. It is also shown that the device maintains stable performance under varying angles of incidence, with optimal sensing characteristics achieved at normal incidence. By appropriately scaling the structure, the resonance frequency is shifted to 8 GHz, enabling accurate discrimination among edible oils, brake fluids, and selected industrial solvents. These characteristics make the proposed metamaterial perfect absorber a promising platform for rapid, precise, and non-destructive chemical identification in industrial and environmental applications.
Keywords
Subjects
