Nirit Dudovich,Weizmann Institute of Science, Israel.
“Attosecond Interferometry”
Chair: Alicia Palacios (Universitdad Autónoma de Madrid, ES)

Abstract:

One of the most exciting advances in attosecond science is high-harmonic generation (HHG) spectroscopy. It combines sub-angstrom spatial resolution with attosecond temporal resolution, allowing us to dynamically resolve the structure of electronic wavefunctions as they evolve. During the past two decades, HHG spectroscopy has been successfully applied to resolve fundamental strong-field phenomena such as field-induced tunneling in atoms, hole dynamics, charge migration in molecules and field-induced currents in solids. An important aspect of HHG spectroscopy lies in its coherent nature. The strong-field interaction directly transfers the coherence of the laser field into the coherent properties of the electronic wavefunction that interacts with the field and then back into the optical properties of the emitted harmonics. Resolving the internal coherence is key to reconstructing the internal dynamics, being one of the primary challenges in HHG spectroscopy. As in many other branches of physics, the presence of coherence is determined through interferometry. In this talk, I will describe advanced schemes for attosecond interferometry.

Applying time domain interferometry, provided a direct insights into one of the most fundamental strong field phenomena – field induced tunneling, resolving its fundamental properties. Inducing spatial interferometers, by shaping 2D electron trajectories, we probed the spatial properties of tunneling in molecular systems. An alternative scheme applies attosecond interferometry based on an all-optical approach. By using two interfering phased-locked attosecond sources, we resolved the scattering phase associated with the basic mechanism underlying photoionization.

Going from gas phase into solid state systems opens new frontiers in attosecond science. Strong field phenomena in solids raise new challenges as the role of the band structure and the quantum nature of ultrafast electron-hole dynamics have yet to be resolved. Attosecond interferometry enabled us to obtaine a new insight into the origin of multiband strong field currents. We probed the underlying attosecond dynamics that dictates the temporal evolution of carriers in large bandgap dielectrics via HHG spectroscopy and visualized the structure of multiple unpopulated high-energy conduction bands.

If you have already registered but have not received the link to the webinar, please contact: Attochem@brightelm.co.uk

To register for this event, please, follow this link: https://brightelm.eventsair.com/attochem-webinar-series-2021/reg/Site/Register

Olga Smirnova, Max-Born Institut, Berlin, Germany
“Ultrafast chirality: twisting light to twist electrons”
Chair: Fernando Martin (Universitdad Autónoma de Madrid, ES)

Abstract: I will describe several new, extremely efficient approaches to chiral discrimination and enantio-sensitive molecular manipulation, which take advantage of ultrafast electronic response [1,2].  One of them is based on the   new concept of synthetic chiral light [3,4], which can be used to trigger bright nonlinear optical response in the molecule of a desired handedness while keeping its mirror twin dark in the same frequency range. The other is based on the new concept of  geometric magnetism in photoionization of chiral molecules and leads to a new class of enantiosensitive observables in photoionization [5].

[1] S Beaulieu et al, Photoexcitation circular dichroism in chiral molecules, Nature Physics 14 (5), 484 (2018)
[2] AF Ordonez, O Smirnova, Generalized perspective on chiral measurements without magnetic interactions, Physical Review A 98 (6), 063428, 2018
[3] D Ayuso et al, Synthetic chiral light for efficient control of chiral light–matter interaction, Nature Photonics 13 (12), 866-871, (2019)
[4] D. Ayuso et al “Enantio-sensitive unidirectional light bending”, Nat Commun 12, 3951 (2021)
[5] AF Ordonez, D Ayuso, P. Decleva, O Smirnova “Geometric magnetism and new enantio-sensitive observables in photoionization of chiral molecules” http://arxiv.org/abs/2106.14264

To register for this event, please, follow this link: https://brightelm.eventsair.com/attochem-webinar-series-2021/reg/Site/Register

If you have already registered but have not received the link to the webinar, please contact: Attochem@brightelm.co.uk

The first Attochem Young Scientists’ Symposium 2021, will be held online from the 14th to the 17th of September 2021.

This event will be intended to scientists, both theoreticians and experimentalists, working in the development of attosecond technologies and techniques in chemistry, with a particular focus on early-career researchers. The topics covered will range from theoretical modelling of complex molecules, chemical dynamics, and electronic correlations to the development of novel light sources and the implementation of experimental schemes to study and control the time-resolved dynamics of molecules, liquids, and solids. The main purpose of the event will be to foster experimental and theoretical efforts for exploiting the enormous potential of attosecond techniques in chemistry. In particular, young scientists and early-stage researchers will have the opportunity to present their work and share their experiences. These presentations will be accompanied by plenary talks and panel discussions held by senior scientists, all distinguished and leading experts of the field. This will allow to put the innovative work of young researchers into perspective, and it will promote important opportunities for mentoring and advising between scientists in different stages of their careers.

The current list of confirmed speakers includes:

For more information, visit the event website:

Website: https://attoyss2021.github.io/registration.html
Book of Abstracts: https://attoyss2021.github.io/files_yss2021/book_of_abstract_yss2021_v1.pdf
Oral presentations: https://www.youtube.com/channel/UCsUudQkqiW1SZ9aojOTKq_A/featured

Laura Cattaneo, Max-Planck-Institut für Kernphysik, Heidelberg, Germany
“Looking at liquid crystals in the ultrafast time scale”
Chair: Dr. Davide Faccialà (CNR-IFN, IT)

Abstract: Although matter is divided in the three well-defined categories solid, liquid, and gas, there are certain states not exclusively belonging to either one of these categories. Liquid crystals (LCs) are one of these meta-phases, ordered like solids but fluid like liquids. So far, the physics of phenomena occurring in the ultrafast time scale, namely from picosecond down to attosecond, in soft matter and in particular LCs, where the electrons and fast vibrational modes play the dominant role, is largely unexplored. In this talk I will introduce the audience to the liquid crystal world and some spectroscopic tools currently available to study them in the ultrafast time scale, possibly showing preliminary results from our new-born ULCD group at MPIK.

To register for this event, please, follow this link: https://brightelm.eventsair.com/attochem-webinar-series-2021/reg/Site/Register

If you have already registered but have not received the link to the webinar, please contact: Attochem@brightelm.co.uk

The European Optical Society organises for the first time a meeting on Ultrafast optical technologies and applications.

chair: Thomas Südmeyer and Oliver Heckl

Where: Rome Italy

When: 13-17 September 2021

To students and early career researchers, awards are available on applications to support you.

Please circulate the information to your teams and collaborations.

Looking forward meeting you all in good health.

More details:

https://www.europeanoptics.org/pages/events/eosam2021/toms/ultrafast.html