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The presented results clearly confirm that femtosecond patterning can be used to mold wetting properties. The influence of both surface corrugation and chemical composition to the wetting properties has been thoroughly investigated, discussed and explained. Even though the laser interaction changed both the surface morphology and the chemical composition, the wetting properties were predominantly influenced by the small change in morphology causing the increase in the contact angle of ~80%, which could not be explained classically.
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The contact angle (CA) values of the water droplets on the surface were estimated and the values between unmodified and modified samples were compared. The interaction generated high-quality laser-induced periodic surface structures (LIPSS) of spatial periods between 740 and 790 nm and with maximal average corrugation height below 100 nm. In this account, we exposed multilayer thin metal film samples of different materials to a femtosecond laser beam at a 1030 nm wavelength. The influence of material characteristics-i.e., type or surface texture-to wetting properties is nowadays increased by the implementation of ultrafast lasers for nanostructuring. We believe these results lay the groundwork for further complete assessment of superhydrophobicity induced by quantum fluctuations freezing.
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While the latter ones allow hydrophobicity, only the former ones allow for superhydrophobicity. Some of these surfaces can indeed freeze quantum photon modes while others cannot. Then, relying on this theoretical framework, we experimentally study patterned silicon surfaces on which organosilane molecules were grafted, all the coated surfaces having similar characteristic pattern sizes but different profiles. In this article, we first theoretically establish the expected phenomenological features related to such a kind of "quantum" superhydrophobicity. This effect would then compete with the classical Cassie-Baxter interpretation of superhydrophobicity. Previous theoretical works suggested that superhydrophobicity could be enhanced through partial inhibition of the quantum vacuum modes at the surface of a broadband-absorber metamaterial which acts in the extreme ultraviolet frequency domain.