研究目的
To propose a tunable dielectric metamaterial absorber in the terahertz (THz) range for applications in THz imaging, sensing, switching, and filtering.
研究成果
The proposed tunable THz dielectric metamaterial absorber demonstrates a significant modulation depth and can be utilized in various active THz apparatuses. It adds a new candidate beyond traditional broadband and frequency tuning absorbers, benefiting applications such as energy harvesting and spatial light modulations.
研究不足
The study is based on numerical simulations with experimental feasibility considered. The actual performance may vary due to fabrication tolerances and environmental conditions.
1：Experimental Design and Method Selection:
The absorber is composed of a silicon pillar array embedded in a liquid crystal (LC) layer, sandwiched by two graphene electrodes. The LC orientation is tuned by varying the applied bias.
2：Sample Selection and Data Sources:
The silicon pillar array is fabricated on a 60-μm-thick heavily-doped silicon on insulator (SOI) using a Bosch process.
3：List of Experimental Equipment and Materials:
Includes fused silica substrates, graphene electrodes, polydimethylsiloxane (PDMS) film, silicon pillar array, and a home-made high-birefringence LC NJU-LDn-
4：Experimental Procedures and Operational Workflow:
The silicon pillar array is bonded to the substrate with oxygen-plasma-treated PDMS, and the top SOI handle is stripped off. The cell is formed by spincoating with a sulfonic azo dye (SD1) alignment layer and separated by a 110-μm-thick Mylar film.
5：Data Analysis Methods:
Simulations were carried out using the commercial Lumerical FDTD Solutions to analyze the optical properties of the absorber.
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