ArticleScientific reports2025
Stable and switchable [Formula: see text]-based metasurfaces in the near-infrared region.
Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Metasurfaces, with their remarkable ability to control electromagnetic beams, provide great prospects for optical systems. Recently, active metasurfaces have gained more attention compared to passive ones due to their tunable functionality. However, most active metasurfaces just focus on tunability, this work presents [Formula: see text]-based metasurfaces that consider both stable and tunable functions. The proposed design investigates the performance of metasurfaces at two distinct temperatures, [Formula: see text] = [Formula: see text] C and [Formula: see text] = [Formula: see text] C, for two input wavelengths [Formula: see text] = 900 nm and [Formula: see text] = 1500 nm. The metasurfaces include metalenses and gradient metasurfaces, each with a specific structure for different wavelengths, and are constructed with polarization-insensitive metaatoms. Numerical simulations reveal that at [Formula: see text] = [Formula: see text] C, the metasurfaces exhibit considerable focusing efficiencies and precise refracted beam directions for two input wavelengths. When the temperature changes to [Formula: see text] = [Formula: see text] C, the operations of metasurfaces remain stable for [Formula: see text] = 900 nm due to the stable state of [Formula: see text] at this wavelength range. In contrast, at [Formula: see text] = 1500 nm, they undergo a sharp change because of an insulator-to-metal (IM) phase transition of [Formula: see text] at this wavelength. Specifically, focusing efficiency drops to zero, and no refracted beam with a specified direction is observed at [Formula: see text] = 1500 nm. Therefore, this work with the stable performance at [Formula: see text] = 900 nm and the switchable performance at [Formula: see text] = 1500 nm, would be applicable for thermally adaptive optical systems sensitive to temperature variation.
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