研究目的
Investigating the active control of narrowband total absorption using terahertz hybrid Dirac semimetal-graphene metamaterials.
研究成果
The study demonstrates an active controllable narrow-band total absorption based on hybrid Dirac semimetal-graphene metamaterials, which can modulate the absorption peak in three ways. The structure achieves polarization insensitivity and maintains good absorption stability under varying angles of incidence. It also shows excellent bio-chemical sensing properties, making it suitable for applications in modulators, filters, and photodetectors.
研究不足
The study is limited to numerical simulations and theoretical analysis. Practical fabrication and experimental validation are not discussed.
1：Experimental Design and Method Selection:
The study utilizes numerical simulations to analyze the absorption properties of a structure consisting of graphene, Photoactive Silicon, and bulk Dirac semimetal (BDS). The coupled mode theory (CMT) is used to explain the physical mechanism of total absorption.
2：Sample Selection and Data Sources:
The structure is a periodic arrangement of a unit cell with specific geometric parameters. The materials used include graphene, Photoactive Silicon, BDS, and SiO2 substrate.
3：List of Experimental Equipment and Materials:
The study uses FDTD Solutions from Lumerical, Canada, for numerical simulations. Materials include graphene, Photoactive Silicon, BDS, and SiO
4：Experimental Procedures and Operational Workflow:
A beam of plane light polarized along the x direction is vertically incident on the absorber. Periodic boundary conditions are used in the x and y directions, and the perfect matching layer (PML) is applied to the z direction.
5：Data Analysis Methods:
The absorption spectrum is analyzed using numerical simulations and CMT to understand the critical coupling and guided resonance phenomena.
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