Plasmon-Induced Transparency Performance of Multi-Layered Graphene-Phosphorene Structure in THz Region

Abstract This paper investigates the optimization and tunability of THz refractive index plasmon-induced transparency sensors with multiple layers of asymmetric dark modes using Finite-Difference Time-Domain simulations. Notable findings include enhanced absorption peaks at higher frequencies in structures incorporating diverse dark mode materials, specifically graphene-dominated structures. This study also explores dynamic tunability through voltage application to graphene dark modes, showcasing potential applications in practical tunable THz sensors. Additionally, optimal sensor performance is explored when the sample material is placed in various positions relative to the last dark mode of the structure, providing insights into spatial arrangement optimization. Overall, this research contributes new perspectives on the impact of material diversity, dynamic tunability, and sample layer placement for advancing THz refractive index sensors.