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Tuning the infrared resonance of thermal emission from metasurfaces working in near-infrared
Summary
Researchers designed and tested a metasurface — a precisely engineered array of tiny metal structures — that can control the wavelength of infrared light emitted or absorbed, demonstrating that adjusting the geometry and orientation of the structures allows fine-tuned control of the thermal emission spectrum for potential sensing and imaging applications.
We simulated numerically and demonstrated experimentally that the thermal emittance of a metasurface consisting of an array of rectangular metallic meta-atoms patterned on a layered periodic dielectric structure grown on top of a metallic layer can be tuned by changing several parameters. The resonance frequency, designed to be in the near-infrared spectral region, can be tuned by modifying the number of dielectric periods, and the polarization and incidence angle of the incoming radiation. In addition, the absorbance/emittance value at the resonant wavelength can be tuned by modifying the orientation of meta-atoms with respect to the illumination direction.
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