A macrolens with fully covered nanopillars in large area was fabricated by a combination of air-assisted deformation and nanoimprinting. The planar nanopillars were transformed into macrocurved distribution by air-assisted deformation. We tested the nonwetting and antireflectance performance of the fabricated structures and both performances improved by the addition of nanopillars relative to the planar surface. The nanopillars and the curved architecture increased the contact angle by 27 deg and 13 deg, respectively. In addition, the height and diameter of the macrolens could be controlled precisely by the change of the mold size and adjustment of applied negative pressure. Furthermore, the surface reflection was reduced by 1% to 2% over a wavelength range of 500 to 2200 nm by the introduction of gradual index variation. The proposed method is simple, controllable, and has high fabrication efficiency. The macrolens with nanopillars have wide potential applications, such as in optical devices for harsh environments.
Micro-structures offer superior functions such as superhydrophobicity, selfcleaning, anti-wear and drag reduction. In this paper, various microstructures were fabricated by rear-side picosecond laser irradiation of two-layer materials. The material of underlying layer was commonly commercial available ink; the material of surface layer was PMMA. The high light absorptivity of underlying material result in significantly reduced absorption depth. The laser source could therefore be regarded as plane heat source, leading to better surface morphologies after the mater-laser interaction. The results showed that convex structures were obtained at a lower laser fluence; with increase of laser fluence, a doughnut-like structures were obtained; with further rise of laser fluence, bowl-like structures would be obtained. Moreover, the size of microstructures could be tuned by adjusting laser processing parameters such as laser power, frequency and laser-mater interaction time. This method provides an insight for fabrication of functional surface.
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