Dual‐Bias Graphene Ring‐Based THz Absorber: Wearable Optical Sensor

ABSTRACT Two stacked layers of graphene on a typical dielectric with a back reflector are proposed. The structure is designed to stabilise the absorption response against probable mismatches. Additionally, the proposed absorber is modelled by an equivalent circuit model. Based on the optimised response, the design parameters can be selected by known algorithms. The finding suggests that the proposed structure is able to show absorption peaks in THz gap. Furthermore, the appropriate convergence of the circuit model approach with the full‐wave simulation is a motivating reason to interact more deeply with the impedance matching concept. According to the simulation results, the proposed absorber express acceptable reliability against the design parameters while it can cover almost all of the THz gap and beyond (0.1 THz–20 THz). Design simplicity with an alternative modelling approach is leveraged in this work which can be exploited in several applications ranging from healthcare to the indoor communication.