Controlling 2D laser nano structuring over large area with double femtosecond pulses

Results of the work in the Laser4Fun project has been published as:

F. Fraggelakis, G. Mincuzzi, J. Lopez, I. Manek-Hönninger and R. Kling. Controlling 2D laser nano structuring over large area with double femtosecond pulses. Applied Surface Science, November 2018

Abstract

Laser surface texturing is an established way to introduce surface functionalities on solid surfaces. By means of femtosecond laser sources, it’s possible to texture a variety of solids such as metals, semiconductors and transparent materials, introducing features of different symmetry and size. Fabrication of laser induced periodic surface structure (LIPSS) which typically range in the near-submicron length scale can lead to strong modifications of surface wetting, tribological and optical properties. Controlling LIPSS morphology could enable us to mimic functional textures found in nature, introducing functionalities such as antireflectivity and bactericidity. Several works demonstrate the impact of polarization control and double-pulse irradiation on determining texture symmetry and size. Here we present a comprehensive study on controlling laser induced structures by double femtosecond pulse irradiation. The effect of pulse polarization and interpulse delay is elucidated and the generation of novel 2D surface morphologies is reported. A plausible interpretation of the structure formation mechanism is proposed in the frame of non-linear convection flow. A high average power industrial femtosecond laser source with a pulse duration of 350 fs operating at high repetition rate was employed for the experiments. Large areas were processed by combining different 2D morphologies generating a holographic pattern. We believe that our results provide a novel insight in controlling laser induced submicron morphology. Moreover, the presented surface texturing process is scalable in terms of processed area and cycle time and fully compatible with high repetition rates, demonstrating for the first time the feasibility to introduce double-pulse processing in an industrial environment.

Link(s)

Annual Technical Board and Supervisory Board Meeting in Bari, Italy (2018)

The 2018 Technical Board (TB) meeting and Supervisory Board (SB) meeting of the Laser4Fun project took place on October 4 and 5 in Bari, Italy. The meeting was hosted by prof. Antonio Ancona of IFN-CNR, Istituto di Fotonica e Nanotecnologie, Bari, Italy. The TB & SB discussed the progress of the project, results, management and reporting issues, as well as communication and dissemination topics. Also all Early Stage Researchers (ESRs) presented their progress and results to the SB. We were happy to conclude the project is well on track.

Technical Board (TB) meeting and Supervisory Board (SB) and all ESRs during the annual progress meeting in Bari, Italy.
Technical Board (TB) and Supervisory Board (SB) and all ESRs during the annual progress meeting in Bari, Italy.

Summer School on Laser Micro/Nanostructuring and Surface Tribology 2018

The 3rd Laser4Fun international Summer School took place from October 1st to 5th and was hosted by prof. Antonio Ancona of the IFN-CNR, Istituto di Fotonica e Nanotecnologie in Bari, Italy. The participants of the summer school were “fully-immersed” into the world of Laser Micro/Nanostructuring and Surface Tribology. Lectures and presentations by academic experts and of the participants alternated, with ample time for discussions. Topics included, but were not limited to:

  • Contact mechanics of elastic bodies, by dr. Ing. Carmine Putignano (Politecnico di Bari, Department of Mechanics, Mathematics and Management)
  • Universal lab-on-a-chip platform for complex, perfused 3D tissues generated by 3D printing – opportunities and perspectives for laser technology, by dr. Ing. Udo Klotzbach (Fraunhofer-Institut Material and Beam Technology IWS Dresden, Business Unit Manager Microtechnology)
  • Management of innovative project at Bosch: LST case study, by ing. Antonio Grimaldi and Ing. Renato Giannoccaro (Robert Bosch Group – Centro Studi Componenti per Veicoli s.p.a)
  • Cross Cultural Competences through cooperation and autonomy. Learning organization: higher education management and research administration, by dr.ssa Mariapia Circella (Physics Department, University of Bari)
  • Femtosecond laser micro-fabrication of polymeric lab-on-chip for advanced and mini-invasive diagnostics, by Udith K. Vadakkum Vadukkal (University of Bari, Italy)
  • Femtosecond laser bursts induced micro and nanostructuring on steel surface, by Giuseppe Giannuzzi (Università di Bari, Italy)
  • Contact mechanics of viscoelastic bodies, by prof. Ing. Giuseppe Carbone (PoliBa- Department of Mechanics, Mathematics and Management)
  • University of 21st century: threats and opportunities. Organizational chart: practical experiences, by dr.ssa Mariapia Circella (Physics Department, University of Bari)
Prticipants of the international School on Laser Micro/Nanostructuring and Surface Tribology 1st-5th October 2018, Bari, Italy
Prticipants of the international School on Laser Micro/Nanostructuring and Surface Tribology
1st-5th October 2018, Bari, Italy

Melissa Sikosana breaks the wall of bacteria related deaths

On September 25th, Melissa Sikosana (ESR), has been awarded 3rd place by a distinguished jury, for “breaking the wall of bacteria related deaths”, at the “Falling Walls Lab Marie Sklodowska-Curie Actions Event“. This event was organised by the European Commission in collaboration with the European Parliament and supported by the Falling Walls Foundation.

The Falling Walls Lab challenging inter-disclipinary platform that invites talent academics, professionals and entrepreneurs from around the world to present breakthrough-research work, within 3 minutes, each to an audience of industry experts & decision makers.

Patricia Reilly, ‘Deputy Chief of Staff (or Deputy Chef de Cabinet) for EU Commissioner for Education Culture, Youth and Sport’ presented the award to Melissa.

FWL-award-Sikosana-2018-2

FWL-award-Sikosana-2018-1

Vittorio Vercillo runner up of Best Speaker Award

Last 11th of September 140 people, among students, supervisors and management, gathered in the ZAL (Zentrum für Angewandte Luftfahrtforschung) facilities in Hamburg for the 11th edition of the Airbus PhD Day 2018. Vittorio Vercillo, an Early Stage Researcher (ESR) in the Laser4Fun project, was awarded of the Best Speaker Award, Runner Up, for his contribution “Laser micro-/nano-structuring to produce icephobic surfaces”. In the picture, Vittorio receives the award from Dr. Michael Schoenwetter, Airbus R&T Partnerships & Contracting.

VERCILLO-Phd-Day-2018
Vittorio Vercillo (left) receives the award from Dr. Michael Schoenwetter

No more cleaning: Lasers make the lotus effect on aircraft

Filigree engravings on external surfaces of aircraft are intended to ensure that airflow remains smooth and drag on the aircraft low. For this, engineers at the Fraunhofer Institute for Material and Beam Technology IWS, the Technische Universität Dresden and Airbus have developed a laser process that produces textured surfaces at high throughput making surface contamination more difficult.
More details can be found at:

Biomimetic Surface Structuring Using Laser Based Interferometric Methods

Results of the work in the Laser4Fun project has been published as:

Andrés Fabián Lasagni, Sabri Alamri, Alfredo Ismael Aguilar-Morales, Florian Rößler, Bogdan Voisiat and Tim Kunze. Biomimetic Surface Structuring Using Laser Based Interferometric Methods. Appl. Sci. 2018, 8(8), 1260

Abstract

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 with length-scales in the micrometer and sub-micrometer range. Different strategies are discussed to produce a wide variety of periodic arrays, depending on the number of resist lasers used as well as the way in which the exposure steps are organized. After that, periodic patterns are fabricated on polymers using ns laser pulses from an UV-laser system. Additionally in this case, multiple-scale patterns are produced by using different strategies. A similar approach is described to treat metallic surfaces of steel X6Cr17 and a titanium alloy Ti6Al4V. The geometry of the produced microstructures was characterized using scanning electron microscopy and confocal microscopy. Measurement of water contact angle is performed for both polymer and metallic surfaces..

Link(s)

Laser4Fun session at LPM2018 conference in Edinburgh, Scotland, UK

The 19th International Symposium on Laser Precision Microfabrication (LPM 2018, www.lpm2018.org) takes place on June 25-28, 2018 in Edinburgh, Scotland, UK. This symposium is the world’s number one meeting of the laser user community where the most advanced developments and recent trends in laser application for fine and precise fabrication of diverse materials are discussed between industry, research and academia.

Today, Tuesday June 26th, a whole session was dedicated to presentations by near all our ESRs, disseminating results from the Laser4Fun project.

LPM2018-laser4fun
Photo: Giuseppe Giannuzzi