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2026

Sub-Micron Metasurface–Reconfigured Multiband Smart Window

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The Yi Long team at the Chinese University of Hong Kong has developed a sub‑micron metasurface‑based, reconfigurable, multi‑band thermochromic smart window (Meta‑MTSW). Fabricated via template‑assisted nanoimprint lithography, this smart window overcomes key limitations by integrating subwavelength nanostructures. Both theoretical and experimental analyses demonstrate that a gradient‑structured impedance‑matching layer can minimize Fresnel reflections in the visible and near‑infrared bands without perturbing Fabry–Perot resonances in the long‑wave infrared range. Consequently, compared with state‑of‑the‑art reference windows, the Meta‑MTSW exhibits a 60.1% improvement in transmittance while maintaining constant ΔT and Δε values. Comprehensive building energy simulations across eight climate zones reveal that, relative to commercial low‑emissivity glass, the Meta‑MTSW can reduce annual energy consumption by up to 15.9%, thereby validating this nanoengineering approach as an effective strategy for climate‑adaptive, sustainable architecture.

The research findings were published on June 23, 2026, in Advanced Functional Materials, under the title “Submicron Metasurface Reconfigured Multiband Smart Windows.”