Mechanically and thermally stable thin sheets of broadband antireflection surfaces fabricated by femtosecond lasers

Thirunaukkarasu, K; Taher, Md Abu; Chaudhary, Nitin; Rajput, Vinod K.; Naik, Chavan Akash; Gautam, Jai Prakash; Naraharisetty, Sri Ram G.

doi:10.1016/j.optlastec.2022.107935

Cited by 9 publications

(5 citation statements)

References 42 publications

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“…Figure S1 presents camera images of the Mo/MS produced by the raw fs-PLD process (Figure S1a), the Mo-1.5/MS obtained after laser scanning of Mo/MS at 1.5 J/cm 2 (Figure S1a), and MoO x /MS produced after laser-scanning the Mo-1.5/MS (Figure S1c) with 0.2 J/cm 2 . From the physical appearance, the Mo/MS is the darkest, hinting at the presence of rough light-scattering features on the surface responsible for reduced specular reflections [43]. Similarly, the Mo coat depicts a very low packing density and reduced adhesion with the MS substrate.…”

Section: Resultsmentioning

confidence: 99%

A Two-Step Femtosecond Laser-Based Deposition of Robust Corrosion-Resistant Molybdenum Oxide Coating

et al. 2023

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A two-step femtosecond-pulsed laser deposition (fs-PLD) process is reported for the rapid development of uniform, poreless, crack-free, and well-adhering amorphous coatings of source materials with a high melting point. The first step comprises a high-rate raw deposition of the source material via fs-PLD, followed by a second step of scanning the raw sample with fs laser pulses of optimized fluence and scan parameters. The technique is applied to develop substoichiometric molybdenum oxide (MoOx, x < 3) coatings on mild steel. The thickness of the layer was ~4.25 μm with roughness around 0.27 μm. Comprehensive surface characterization reveals highly uniform and relatively moderate roughness coatings, implying the potential of these films as robust corrosion-resistant coats. Corrosion measurements in an aqueous NaCl environment revealed that the coated mild steel samples possess an average corrosion inhibition efficiency of around 95% relative to polished mild steel.

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Section: Resultsmentioning

confidence: 99%

A Two-Step Femtosecond Laser-Based Deposition of Robust Corrosion-Resistant Molybdenum Oxide Coating

et al. 2023

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“…Femtosecond laser machining has attracted widespread attention because micro/nano periodic surface structures can be produced in a convenient way through this kind of advanced technology [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. Similar to the natural hierarchical structures found in our world, the man-made micro/nano periodic surface structures have been proven to have a significant influence on material surface properties, such as adjusting wetting performance [ 11 , 12 , 13 ], enhancing light absorption [ 14 , 15 , 16 ] and strengthening tribological and corrosion properties [ 17 , 18 , 19 , 20 ], thus demonstrating their bright application prospects in high-end manufacturing fields.…”

Section: Introductionmentioning

confidence: 99%

Formation and Evolution of Micro/Nano Periodic Ripples on 2205 Stainless Steel Machined by Femtosecond Laser

Cheng

Zhao

et al. 2023

Micromachines

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The preparation of micro/nano periodic surface structures using femtosecond laser machining technology has been the academic frontier and hotspot in recent years. The formation and evolution of micro/nano periodic ripples were investigated on 2205 stainless steel machined by femtosecond laser. Using single spot irradiation with fixed laser fluences and various pulse numbers, typical ripples, including nano HSFLs (‖), nano LSFLs (⊥), nano HSFLs (⊥) and micro grooves (‖), were generated one after another in one test. The morphologies of the ripples were analyzed, and the underlying mechanisms were discussed. It was found that the nano holes/pits presented at all stages could have played a key role in the formation and evolution of micro/nano periodic ripples. A new kind of microstructure, named the pea pod-like structure here, was discovered, and it was suggested that the formation and evolution of the micro/nano periodic ripples could be well explained by the pea pod-like structure model.

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“…Alternatively, an emerging method, fabrication via pulsed lasers, proved to be an attractive tool for fabricating nanostructures on different surfaces, − with a wide range of applications in controlling wettability, − surface coloring, − subwavelength structures, − surface-enhanced Raman spectroscopy, tuning reflectivity properties, etc. As these structures are surface modifications made of the same material within a depth of a few microns, they possess the intrinsic stability to sustain harsh environments . Laser surface patterning is very efficient in the fabrication of anti-reflective (AR) surfaces, as it can be scaled to the industry with optimized parameters and is a single-step process.…”

Section: Introductionmentioning

confidence: 99%

“…As these structures are surface modifications made of the same material within a depth of a few microns, they possess the intrinsic stability to sustain harsh environments. 47 Laser surface patterning is very efficient in the fabrication of anti-reflective (AR) surfaces, as it can be scaled to the industry with optimized parameters and is a single-step process. However, the smallest size of the microstructures and their aspect ratio have an impact on their antireflective properties, which indeed depend on the diffraction-limited spot size of the laser focus used for making these structures.…”

Section: Introductionmentioning

confidence: 99%

Microstructured Ultra-black Thin Stainless-Steel Sheets Fabricated by Sagnac Interferometric-Based Ultrafast Laser Patterning

Thirunaukkarasu

Chaudhary

Ponnan

et al. 2023

ACS Appl. Eng. Mater.

Self Cite

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Antireflective surfaces that are efficient over a broad spectral range with extremely low total reflectivity have abundant potential applications in defense, space, and industries. We successfully fabricated three-dimensional micro-to-nano hierarchical structures on a thin sheet of stainless steel (SS), 100 μm in thickness, by interference-based ultrafast laser patterning for near-perfect absorption. The Sagnac-based interferometer reduces the footprint of the laser on the substrate to smaller than the diffraction limit. In this work, we achieved a groove cut of 13 μm size using a 1030 nm ultrafast laser. We achieved an average total reflectivity of 1.2% over the spectral range of 400–2000 nm and an average specular reflectivity of 0.02% over a broad range of wavelengths of UV–visible–NIR (400–2000 nm) on thin low-weight SS sheets. Further, the average total reflectivity in the spectral region of 400 to 650 nm was 1.1% only. The average groove depth from the top of the surface was 8.5 μm, and most of the material was intact in this process. As these structures are modifications of the same material, they have high mechanical strength and thermal stability and also exhibit self-cleaning ability. The patterned surface is insensitive to incident polarization and has a wide range of acceptance to the incidence cone angle of ±60°. These are the best anti-reflectivity values on an SS surface fabricated via laser surface patterning.

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Mechanically and thermally stable thin sheets of broadband antireflection surfaces fabricated by femtosecond lasers

Cited by 9 publications

References 42 publications

A Two-Step Femtosecond Laser-Based Deposition of Robust Corrosion-Resistant Molybdenum Oxide Coating

A Two-Step Femtosecond Laser-Based Deposition of Robust Corrosion-Resistant Molybdenum Oxide Coating

Formation and Evolution of Micro/Nano Periodic Ripples on 2205 Stainless Steel Machined by Femtosecond Laser

Microstructured Ultra-black Thin Stainless-Steel Sheets Fabricated by Sagnac Interferometric-Based Ultrafast Laser Patterning

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