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MASTER | Laser nano-printing

Context. The general purpose of this project is the development of a digital laser printing technology [1] to realize 3D structures by the deposition of pixels with elementary sizes ranging from 100nm to few micrometers. The approach is based on the double pulse Laser-Induced Forward Process (LIFT) and this study will be focused on metallic materials. The process consists in the irradiation by a first long duration laser pulse of a solid thin film deposited on a transparent donor substrate, to locally melt the film, followed by a second irradiation with a femtosecond pulse laser beam (fs, ps) to initiate the material transfer towards a receiver substrate, set in front of the donor one. This double pulse LIFT technique has been patented in 2015 and the first studies have validated the concept and led to the printing of sub-micrometers pixels of copper.

Objectives of the master thesis. Since two years, a PhD student works on this subject. He already implemented the experimental setup that includes a dual laser irradiation system and a time-resolved imaging system [2]. Copper and gold dots with diameter as small as one micrometre have been laser printed [3], and recently, copper pillars of 2µm diameter have been realized. However, the development of laser printing at the nanometer scale represents a real challenge. To reach this objective, both the thickness of the donor film and the beam diameter need to be downscaled. To do so, a beam shaping system will be implemented to transform the Gaussian beam into a Bessel beam. It will be based on the use of an axicon. Then using this new architecture, printing experiments will be realized to transfer nano-droplets of metal (copper, gold). Shadowgraphy will be used to study the ejection dynamics and SEM will allow the morphological characterization of the printed dots. A specific attention will be paid to the process repeatability (positioning, size …)

Specific role of the master student. Under the supervision of the PhD student and the tutor of the internship, the master student will perform the alignment of the laser beams and the printing experiments. The parameters to be varied are the irradiation conditions (fluence, delay between the two pulses), the film thickness, and the distance between the donor and the receiver substrates. The process optimization will be performed thanks to the imaging of the ejection and the SEM characterization of the printed pixels.

- [1] DELAPORTE Ph., ALLONCLE A.-P., ‘Laser-Induced Forward Transfer : A high resolution additive manufacturing technology’, Invited paper, J. of Optics & Laser Technology 78, 33–41 (2016)

- [2] LI Q., ALLONCLE A.-P., GROJO D. DELAPORTE Ph., ‘Generating Liquid Nanojets from Copper by Dual Laser Irradiation for Ultra-High Resolution Printing’, Optics Express 25 (20), pp. 24164-24172 (2017)

- [3] LI Q., ALLONCLE A.-P., GROJO D. DELAPORTE Ph., ‘Laser-induced nano-jetting behaviors of liquid metals’, Applied Physics A 123, 718, (2017)

Keywords : Laser-matter interaction, laser printing, beam shaping, material characterization, nano-materials

Intership supervisor : Philippe Delaporte (DR CNRS) ;

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MSc Thesis description

Post-scriptum :

  • Required skills : background in one or several of the following fields is required Education : Optics & Photonics, material sciences Practice : experimental, laser alignment, beam shaping, material characterization (SEM, AFM), imaging
  • Salary : 570€ / month in agreement with the French regulation.
  • Miscellaneous : This master internship will be co-supervised by a 3rd year Ph.D. student. An excellent candidate will have the possibility to be funded for a PhD after the MS thesis, in the frame of an AMIDEX project. Starting date : From March 1st, 2018.
  • Location : LP3 laboratory, Campus de Luminy, case 917, 13009 Marseille, France