Abstract Fabricating aluminium surfaces with superhydrophobic and ice-repellent properties present nowadays a challenging task. In this work, multifunctional structures are manufactured by direct laser writing interference patterning methods using pulsed infrared radiation (1064 nm). Different periodic patterns feature sizes ranging from 7.0 to 50.0 µm produced. addition, hierarchical textures produced combining both mentioned based methods. Water contact angle tests at room temperature...

A terahertz (THz) imaging system based on narrow band microbolometer sensors (NBMS) and a novel diffractive lens was developed for spectroscopic microscopy applications. The frequency response characteristics of the THz antenna-coupled NBMS were determined employing Fourier transform spectroscopy. found to be very sensitive selective sensor which used develop compact all-electronic multispectral measurements. This successfully applied principal components analysis optically opaque packed...

Multilevel phase Fresnel lenses (MPFLs) with a high numerical aperture for 0.58 THz frequencies were developed. The components based on monocrystalline silicon wafer are prepared by patterning high-speed industrial-scale laser direct writing (LDW) system. Two consistent series of the terahertz-MPFLs quantization levels varying between 2 and continuous kinoform shape focal lengths 5 10 mm produced employing inherent flexibility LDW fabrication process. focusing performance was studied at...

Interference of laser beams with the high pulse energy opens an opportunity direct structuring over large areas. We report results beam interference ablation thin metal films on glass using infrared picosecond laser. The was split into four by a diffractive optical element, and 4F imaging system used to produce pattern surface film. Regular structures period 5 μm were produced in various metals. A variety periodical patterns can be formed method controlling process parameters.

Superhydrophobic natural surfaces usually have multiple levels of structure hierarchy, particularly microstructures covered with nano-roughness. The multi-scale nature such a surface reduces the wetting water and oils, supports self-cleaning properties. In this work, in order to broaden our understanding properties technical surfaces, biomimetic patterns were fabricated on stainless steel single periodic structures using direct laser interference patterning (DLIP). Micropillars spatial...

New semi-empirical equation combining thermal modulation depth, interference period, laser pulse duration and diffusivity for LIA quality is introduced.

Abstract This study focuses on the development of a strategy to produce periodic structures with variable spatial period for increasing homogeneity structural colours by means direct laser interference patterning. Using four-beam configuration, hole-like arrays are produced stainless steel 70 ps pulsed source operating at 532 nm wavelength. The processing parameters optimised obtaining patterns highest possible diffraction efficiency and thus showing colour intensity. A model calculating...

This review investigates the capabilities of laser-based interferometric methods for producing structures with multiple-scaled surface features imitating natural examples. Firstly, laser interference lithography is used to produce hierarchical patterns length-scales in micrometer and sub-micrometer range. Different strategies are discussed a wide variety periodic arrays, depending on number resist lasers as well way which exposure steps organized. After that, fabricated polymers using ns...

Abstract In this study, two-step approaches to fabricate periodic microstructures on polyethylene terephthalate (PET) and poly(methyl methacrylate) (PMMA) substrates are presented control the wettability of polymeric surfaces. Micropillar arrays with periods between 1.6 4.6 µm patterned by plate-to-plate hot embossing using chromium stamps structured four-beam Direct Laser Interference Patterning (DLIP). By varying laser parameters, shape, spatial period, structure height laser-induced...

Laser-based processing techniques have proven to be an effective option of modifying polymer surfaces. In this context Direct Laser Interference Patterning in conjunction with the polygon scanner technique is used fabricate textured polystyrene surfaces through ultra-fast beam deflection. This achieved by using a high-average power picosecond laser combination mirror-based scanning system. The two-beam DLIP optical configuration leads formation line-like structures spatial period 21.0 µm....

New wavelengths of laser radiation are interest for material processing. Results application the all-fiber ultrashort pulsed emitting in 2 µm range, manufactured by Novae, presented. Average output power was 4.35 W a single-spatial-mode beam centered at 1950 nm wavelength. Pulses duration 40 ps, and operated 4.2 MHz pulse repetition rate. This performance corresponded to 25 kW peak almost 1 µJ energy. Material processing performed using three different focusing lenses (100, 30 18 mm)...

The present work utilizes direct laser interference patterning in conjunction with a polygon scanner system to fabricate micro‐ and nanostructures on the surface of nickel foils. A picosecond pulsed source an average power ≈470 W is used pattern line‐like structures having spatial periods 11.0 25.0 μm maximum structure depth up 15 μm. scanning speed number consecutive scans, ranging from 5 500, are varied order assess their influence formation process. Furthermore, use ultrashort pulses...

In this work, the fabrication of gradient periodic line‐like structures with continuously changing spatial period on stainless steel by means two‐beam direct laser interference patterning (DLIP) is studied. A 70 ps (picosecond [ps]) pulsed operating at 532 nm wavelength and 0.64 J cm −2 fluence used to produce microstructures. By overlapping angle between sub‐beams, smoothly increases from 2.01 ± 0.09 3.99 0.12 μm within a 500 long processed area. Different pulse‐to‐pulse overlaps are...

The principles of the holographic lithography technique are reviewed, and ability in formation structures with different periods by SZ2080 is demonstrated. influence laser exposure, phase shift between interfering beams, used wavelength on fabricated four-beam interference has been studied. It shown that using − beams a it possible to reduce period structure √2 times compared four same phase. Fabrication micro-structures can be realized via multi-photon single-photon polymerization...

Fabrication of photonic devices requires fast and reliable microstructuring approach. For example, efficient generation fine 2D patterns in thin metal films is needed plasmonic metamaterial devices. In this paper, the authors present an approach for flexible periodic pattern using a laser beam interference patterning setup. So far, was mostly limited to lines dots. A variety can be significantly increased by controlling polarization orientation each interfering beam. The demonstrate...

In this work, it is demonstrated that direct laser interference patterning (DLIP) a method capable of producing microtextured metallic molds for hot embossing processes. Three different metals (Cr, Ni, and Cu), relevant the mold production used in nanoimprinting systems, are patterned by DLIP using picosecond source emitting at 532 nm wavelength. The results show quality surface topography produced hole-like micropatterns determined processing parameters, such as irradiated energy density...

Interference of several identical laser beams allows for the fabrication periodical structures over large areas. We present two complementary techniques patterning thin films using beam interference and direct ablation material. The first one is based on precise control fluence relative to threshold film. Additional means pattern management are provided by separate intensity phase interfering beams. four or six permits arrays circular holes. Flexibility sensitivity process parameters method...

Interference of laser beams with the high pulse energy opens an opportunity to direct structuring over large areas.We report results beam interference ablation (LBIA) thin metal films on glass substrate irradiated picosecond and nanosecond lasers.The was split into four six by using diffractive optical element.The 4F imaging system used produce pattern surface film.Regular structures a period 5 µm were produced in various metals which can be for filtering infrared or terahertz radiation.The...

Properties of zone plates with integrated bandpass filters were simulated numerically and demonstrated experimentally for 0.76 THz frequency. Finite‐difference time‐domain simulations used to predict properties a conventional plate laser‐ablated resonant filter areas. Zone produced employing laser direct writing characterised by Fourier spectroscopy an optically pumped terahertz laser.

The principles of the holographic lithography technique are reviewed, and ability in formation structures with different periods by SZ2080 is demonstrated. influence laser exposure, phase shift between interfering beams, used wavelength on fabricated four-beam interference has been studied. It shown that using − beams a it possible to reduce period structure √2 times compared four same phase. Fabrication micro-structures can be realized via multi-photon single-photon polymerization...