研究目的
To design a broadband metamaterial absorber with high absorption simultaneously in the MWIR and LWIR where the atmosphere is transparent, for applications in double-color IR imaging, detecting, infrared stealth and passive radiative cooling.
研究成果
The proposed broadband metamaterial absorber achieves high absorption simultaneously in the MWIR and LWIR, with the absorption bands being insensitive to structure parameters and incident angle. This work may greatly promote the practical application of absorbers in various infrared applications.
研究不足
The absorption property is insensitive to the structure parameters with at least ±50 nm tolerance. The absorption in MWIR becomes more narrow and weaker at higher incident angles, though still higher than 75% at 60°.
1：Experimental Design and Method Selection:
The absorber is composed of trapezoid multilayered grating and trapezoid SiO2 hybrid structures. The spectral characteristics are calculated using the finite difference time domain method (FDTD) from Lumerical software package.
2：Sample Selection and Data Sources:
The permittivity of materials (Au, Ge, SiO2) is extracted from Palik's work and simulated by Drude and Lorentz modes.
3：List of Experimental Equipment and Materials:
A gold film, flat metal Au, dielectric plate Ge, and trapezoid SiO2 structures are used.
4：Experimental Procedures and Operational Workflow:
A plane wave light source is used for illumination with its propagation direction and polarization along the negative y-axis and x-axis, respectively. The absorption spectrum is retrieved from scattering parameters.
5：Data Analysis Methods:
The absorption spectrum (A) is calculated as A = 1 - R, where R is the reflection, with transmission T = 0 due to the optically thick bottom gold film.
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