Transparent porous films with real refractive index close to unity for photonic applications

Transparent porous films with real refractive index close to unity for photonic applications

Herein, we demonstrate mechanically stable large-area thin films with a purely real refractive index (n) close to 1 in the optical range. At specific wavelengths, it can reach values as small as n = 1.02, the lowest reported for thin solid slabs. These are made of a...
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