Design of a metamaterial broadband reflector based on hexagonal stacking

Le résumé fourni par la source

To address the urgent demands for thermal management in buildings and electronic devices and to resolve the prevalent issue of narrow operating bandwidth in existing infrared reflectors, this paper proposes a metasurface-based metamaterial broadband reflector. The structure consists of a gold substrate, a SiO₂ dielectric layer, and a silver patterned layer featuring stacked hexagons. Simulation results obtained from COMSOL software demonstrate that the structure achieves an average reflectance of 96.1% and a peak reflectance of 97.5% over the wavelength range of 1500–5000 nm. Characteristics of the electric field map, magnetic field map, and total power dissipation density map are discussed, along with the influence of parameters such as material, periodicity, and pattern layer thickness on its reflective performance. The proposed structure leverages symmetrically distributed local electromagnetic fields to suppress surface plasmon absorption, thereby enabling high reflection across a broad spectrum. This device can be integrated into smart windows and electronic device thermal management systems for directional reflection of infrared radiation, effectively reducing heat absorption, accelerating heat dissipation, and reduction of cooling/thermal management energy consumption. Future geometric optimization and lowcost micro/nano-fabrication are expected to further extend the operating band and advance engineering applications.

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