Achievements of 2022

In preparation of next proposals, the list of communications made in 2022 has now been updated.

In 2022, our group of 2.2 FTEs has:

  • contributed to 3 publications (average IF 6.44) and to 1 chapter for Springer (as 1st author, 1st chapter),
  • attended 7 conferences,
  • given 3 invited oral presentations in international conferences,
  • obtained a 50,000 CZK award from the Czech Academy of Sciences for the best submitted proposal to European Research Council,
  • traveled to USA, Argentina, Austria, France and UK,
  • consumed 8 millions core-hours at PRACE Portugal and IT4I Czech Republic.

Conferences up to June 2023

This half-funded-year, the group of Ultrafast Photonics will participate in the following conferences:

  • June 13th-16th: Laser Precision Microfabrication (LPM) Japan, where TJY Derrien is honored to be co-organizer for a Special Symposium on Machine Learning in Laser Processing with Prof. Ishikawa (University of Tokyo) and Dr. Otobe (QST National Institute for Quantum Science and Technology).
  • June 13th-16th: A poster contribution for the LPM conference with prof. Bulgakova on bridging TDDFT and large-scale modeling using machine learning, a task related to the ATLANTIC project.
  • June 26th-30th: A contribution was submitted to CLEO Europe (Munich), on the observation of symmetry breaking in processing silicon at sufficiently high intensity. The work is supported by experimental results from Dr. Yoann Levy’s group at HiLASE, and is also related to a deliverable of the ATLANTIC project.
  • April 17th-18th: 5th BIATRI workshop will take place on these dates. This year, collaborators from BIATRI & ATLANTIC projects will be invited to the workshop, in addition to few external people.
  • In March 13th-15th, MSc. Krystof Hlinomaz will participate in the Schrödinger’s Society “FemtoMat” workhshop, in the context of preparation of his PhD defense.

Other possibilities:

  • April 23rd-27th: SPIE Photonics 2023 will be hosted in Prague. We did not submit an abstract this year, but one may attend at last moment in consultation mode.

TJY Derrien co-animated the Optica writing workshop for students of the Charles University (Prague)

The faculty of Mathematics and Physics of the Charles University organized a Writing workshop in collaboration with Optica, the former Optical Society of America.

Main organizers were Dr. Clauss Roll, director of Optica Europe and MSc. Andrej Farkas, PhD student of the faculty.

Dr. Clauss Roll presented general aspects of the publication process, and Thibault Derrien, associate editor for Optics Express (Optica) presented the submission and the peer-review processes in more details.

A masterclass for writing abstracts efficiently then took place. Each student wrote a structured abstract and received feedback via online system.

The workshop took place as an hybrid event since TJY Derrien is presently travelling in Argentina.

We are getting trained on a new simulation technique in Mendoza, Argentina

Dr. Thibault J.-Y. Derrien, scientist from the Group of Ultrafast Photonics (Department of Scientific Laser Applications) of the HiLASE Centre, has spent one month in the groups of Prof. Cristian Sanchez and Prof. Mario del Popolo, established at the University de Cuyo, Mendoza (Argentina). During his stay, he was introduced to simulation methods that can predict the consequences of pulsed laser radiation at organic materials and molecules. The methods can be employed to design processes that are based on usage of intense laser light for the fields of organic chemistry, biology and drug design.

This exchange was supported by the Marie Sklodowska Curie Actions (MSCA) for Research and Innovation Staff Exchange (RISE) “ATLANTIC” that funds a network of researchers in numerical modeling of laser irradiation with materials, a program of the European Union (grant agreement no. 823897).

Our latest publication on high harmonic generation is in Communications Physics (Nature Publishing Group)

Researchers from Charles University and HiLASE Centre have published a joint study on the emission of high harmonics emitted by silicon crystal when irradiated by a few-cycle laser pulse. In this work, the group of Martin Kozak (Charles University) measured the energy of photons emitted during the irradiation in the reflection geometry. This enabled to perform a direct comparison with the predictions based on the time-dependent density functional theory (TDDFT), prepared by Thibault Derrien (HiLASE Centre).

The paper evidences the importance of the carrier-envelope phase and of the crystal’s orientation when using ultrashort pulses. The study supports the importance of Van Hove singularities in the angular distribution of the emitted harmonics. Overall, this work demonstrates that quantum approaches and supercomputing are essential for the development of modern laser technologies.

The paper is available at the following address
https://www.nature.com/articles/s42005-022-01075-y.pdf

Journal: Communications Physics (IF 6.459)

Title: Role of Van Hove singularities and effective mass anisotropy in polarization-resolved high harmonic spectroscopy of silicon

Authors: Suthar, P.; Trojánek, F.; Malý, P.; Derrien, T. J.-Y. & Kozák, M.

TJY Derrien attended Benasque TDDFT conference

T. J.-Y. Derrien attended the “9th Time-Dependent Density-Functional Theory workshop: prospects and applications”, held in Benasque (Spain) from Oct. 24th to Oct. 28th. The workshop gathers actors of the TDDFT community and first-principle computations of laser-irradiated materials.

Dr. Derrien presented results on the modification of band structure of solids upon excitation by intense laser light, developed in the context of the WP1-WP2 of the project BIATRI: No. CZ.02.1.01/0.0/0.0/15_003/0000445 and WP5 of Marie Curie RISE ATLANTIC project No. 823897 (www.atlantic-rise.eu).

Website of the conference

Our Springer book chapter is in production

In November 2021, we announced the submission of a chapter for a book edited by Prof. Razvan Stoian and Prof. Jörn Bonse (https://www.quantumlap.eu/springer-chapter-submitted/). We are excited to announce that the production of the book has started and should be available as hard cover around October 2022. Announcement is available at the following address: https://link.springer.com/book/9783031147517.

We are delighted to be published as the first chapter in the Part dedicated to fundamentals of the laser-matter interaction.

The book contains 33 chapters, organized in 3 main parts. The table of contents is not fully disclosed to avoid issues with Copyright agreement.

  • Ultrafast Laser Nanostructuring – The Pursuit of Extreme Scales
    • Foreword R. Stoian* & J. Bonse*: “Ultrafast Laser Nanostructuring – The Pursuit of Extreme Scales – Foreword”
  • Part I: Fundamental Processes in Laser 2D/3D Nanostructuring
    • Chap. 1: T.J.-Y. Derrien, Y. Levy, N.M. Bulgakova*: “Insights into laser-matter interaction from inside: wealth of processes, multiplicity of mechanisms and possible roadmaps for energy localization”
    • […]
  • Part II: Concepts of Extreme Nanostructuring
  • Part III: Functions and Applications


Krystof Hlinomaz published in Int. J. Heat and Mass transfer (IF 5.5)

In preparation of his PhD thesis, our group member MSc. Krystof Hlinomaz has published in the International Journal of Heat and Mass Transfer (Elsevier, IF 5.5).

The paper establishes an efficient description of damage of lossy metallic films deposited on substrates upon interaction with femtosecond and picosecond laser pulses. The results are demonstrating the role of the choice of substrate, and of the choice of film thickness on the film and substrate modification dynamics.

In comparison to existing studies,

  • this work explores a wide range of sample parameters using high power computing,
  • it provides a predictive and robust model benchmarked using several types of validation:
  • a validation of simplified cases on analytical solutions,
  • a real-time monitoring of the energy conservation of the non-linear system,
  • a validation by direct comparison with well established experimental results of the literature.

The work is useful for improving the precision of laser processing of thin metallic films using femtosecond and picosecond laser pulses.

Title of the study is: “Modeling thermal response of Mo thin films upon single femtosecond laser irradiation: dynamics of film melting and substrate softening”

The paper is available here: 10.1016/j.ijheatmasstransfer.2022.123292.