Category: Non classé

Dr. Thibault J.-Y. Derrien, leader of the Group of Ultrafast Photonics of Department of Scientific Laser Applications of the HiLASE Centre, met with the groups of Dr. Matias Berdakin, Dr. German Soldano and Dr. Raul Bustos in Universidad Nacional de Cordoba (UNC, Argentina).

Scientists exchanged on mutual interests and initiated joint collaboration on common thematics.

Strengthening the diplomatic relations and the scientific programs between the Czech Republic and Argentina would be of great benefit for both countries.

This visit was supported by Marie Sklodowska Curie Actions (MSCA) for Research and Innovation Staff Exchange (RISE) “ATLANTIC”, a program of the European Union (grant agreement no. 823897).

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.

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).

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.

T. J.-Y. Derrien attended the “9th Time-Dependent Density-Functional Theory workshop: prospects and applications”, held in Benasque (Spain) from Oct. 24^th to Oct. 28^th. 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

In preparation of joining the group, it will be useful to acquire part of the following IT-related skills.

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