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technical paper
Advanced Laser-Induced Micro & Nano Surface Structuring for Photonic Applications
keywords:
surface functionalization
micro & nano textruring
ultrafast laser surface engineering
This presentation showcases various methods for producing laser-induced micro and nano structures with controllable spatial features, scale, and shape. These structures can be directly fabricated on dielectric surfaces and thin metallic films to enable efficient light manipulation, polarization control, and perfect absorption. By selecting the appropriate structure and processing conditions, we achieve optimal combinations of super-transmissivity, anti-glare, and extreme wetting properties for variable dielectric materials and optical fiber tip use cases. The nanostructured glass surfaces exhibit a high lased damage threshold, even more, that double in particular wavelengths. In addition, we demonstrate a method for producing polarizing plates exclusively via direct laser nano-structuring. Our grating-type planar metasurfaces, consisting of periodically aligned infinite ridges on a uniform transparent substrate, can be used as wire grid polarizers for far or mid-infrared electromagnetic frequencies. We also show that perfect narrow-band absorption can be achieved with gap plasmons polarizing metasurface plates operating in reflection at IR and mid-IR via laser structuring, specifically, laser-induced periodic surface structures (LIPSS) formed on sub-micrometer metallic films. The polarizing efficiency along with the optical responce of these structures was validated through numerical calculations and experimental results. Our study demonstrates that exploiting nanostructure formation on sub-micron metal films and dielectric materials is a promising approach for sophisticated light manipulation and may pave the way toward laser-induced meta-optics.