A rigorous analytical model and design framework for broadband graphene based THz absorbers

چکیده مقاله

Graphene-based THz absorbers have found widespread applications in cutting-edge technologies. Although this area has attracted significant research interest, the lack of an analytical model for accurately analyzing graphene-based THz absorbers remains a major challenge. In this work, an analytical model is introduced to address this gap. Based on this model, key design parameters are extracted and incorporated into a modified framework. Using the modified model, a systematic design procedure for a THz absorber with a graphene layer is proposed. Following this procedure, a THz absorber with array of one-layer graphene ribbons is designed by considering possible fabrication tolerances, and its performance—calculated using the analytical model—is compared with numerical results. The comparison confirms the accuracy of the analytical approach. The proposed absorber achieves more than 90% absorption over a broad frequency range from 0.65 to 1.44 THz (frequency bandwidth 76%). This THz absorber demonstrates strong potential for applications in sensing and communication technologies.