New perspectives on studying temporary and permanent laser-induced phase transitions

June 20, 2024

11:00 am - 12:30 pm

Physics Research Building 1080, Smith Seminar Room

Add to Calendar 2024-06-20 11:00:00 2024-06-20 12:30:00 New perspectives on studying temporary and permanent laser-induced phase transitions - Larissa Boie (PSI, Switzerland) New perspectives on studying temporary and permanent laser-induced phase transitionsLarissa Boie, Paul Scherrer Institute, Switzerland Time: Thursday, June 20 2024 at 11AMLocation: Physics Research Building 1080, Smith Seminar Room ABSTRACT: The control over different phases of matter with lasers can enable the design of interesting functional materials, for example for energy harvesting devices or data storage. Especially on the ultrafast timescale, studying photo-induced phase transitions can reveal correlations between electronic and lattice order that are crucial when trying to switch materials from one phase to another. In my talk, I will discuss several approaches to a better understanding of laser-induced phase transitions in condensed matter. I will present a new source in the mid-IR frequency range to study phonon dynamics in solids allowing for advanced pumping schemes in pump-probe experiments based on chirped difference frequency generation [1]. Being able to drive phonons across barriers in the energy potential landscape is crucial when aiming at permanent phase changes. Furthermore, I will take a closer look on the probe side of ultrafast experiments applying hard X-ray scattering to a charge-density-wave material [2]. Experiments performed at the LCLS show the effect of the choice of scattering vector when probing certain phonons, suggesting a route for selective phonon probes. I will then discuss permanent phase transitions in amorphous materials, applying X-ray diffraction in operando conditions and ex situ to gain a fundamental understanding in laser processing in transparent glasses [3]. [1] B. Liu, H. Bromberger, A. Cartella, T. Gebert, M. Först, and A. Cavalleri, Generation of Narrowband, High-Intensity, Carrier-Envelope Phase-Stable Pulses Tunable between 4 and 18 THz, Opt. Lett. 42, 129, 2017.[2] L. Boie, Towards More Efficient and Specific Driving and Probing of Coherent Phonon Dynamics in Solids, ETH Zurich, 2022.[3] G. Torun, T. Kishi, D. Pugliese, D. Milanese, and Y. Bellouard, Formation Mechanism of Elemental Te Produced in Tellurite Glass Systems by Femtosecond Laser Irradiation, Adv. Mater. 35, 2210446, 2023. Physics Research Building 1080, Smith Seminar Room OSU ASC Drupal 8 ascwebservices@osu.edu America/New_York public

2024-06-20 11:00:00 2024-06-20 12:30:00 New perspectives on studying temporary and permanent laser-induced phase transitions - Larissa Boie (PSI, Switzerland) New perspectives on studying temporary and permanent laser-induced phase transitionsLarissa Boie, Paul Scherrer Institute, Switzerland Time: Thursday, June 20 2024 at 11AMLocation: Physics Research Building 1080, Smith Seminar Room  ABSTRACT: The control over different phases of matter with lasers can enable the design of interesting functional materials, for example for energy harvesting devices or data storage. Especially on the ultrafast timescale, studying photo-induced phase transitions can reveal correlations between electronic and lattice order that are crucial when trying to switch materials from one phase to another. In my talk, I will discuss several approaches to a better understanding of laser-induced phase transitions in condensed matter. I will present a new source in the mid-IR frequency range to study phonon dynamics in solids allowing for advanced pumping schemes in pump-probe experiments based on chirped difference frequency generation [1]. Being able to drive phonons across barriers in the energy potential landscape is crucial when aiming at permanent phase changes. Furthermore, I will take a closer look on the probe side of ultrafast experiments applying hard X-ray scattering to a charge-density-wave material [2]. Experiments performed at the LCLS show the effect of the choice of scattering vector when probing certain phonons, suggesting a route for selective phonon probes. I will then discuss permanent phase transitions in amorphous materials, applying X-ray diffraction in operando conditions and ex situ to gain a fundamental understanding in laser processing in transparent glasses [3]. [1] B. Liu, H. Bromberger, A. Cartella, T. Gebert, M. Först, and A. Cavalleri, Generation of Narrowband, High-Intensity, Carrier-Envelope Phase-Stable Pulses Tunable between 4 and 18 THz, Opt. Lett. 42, 129, 2017.[2] L. Boie, Towards More Efficient and Specific Driving and Probing of Coherent Phonon Dynamics in Solids, ETH Zurich, 2022.[3] G. Torun, T. Kishi, D. Pugliese, D. Milanese, and Y. Bellouard, Formation Mechanism of Elemental Te Produced in Tellurite Glass Systems by Femtosecond Laser Irradiation, Adv. Mater. 35, 2210446, 2023.   Physics Research Building 1080, Smith Seminar Room America/New_York public

Larissa Boie, Paul Scherrer Institute, Switzerland

Time: Thursday, June 20 2024 at 11AM

Location: Physics Research Building 1080, Smith Seminar Room

ABSTRACT: The control over different phases of matter with lasers can enable the design of interesting functional materials, for example for energy harvesting devices or data storage. Especially on the ultrafast timescale, studying photo-induced phase transitions can reveal correlations between electronic and lattice order that are crucial when trying to switch materials from one phase to another. In my talk, I will discuss several approaches to a better understanding of laser-induced phase transitions in condensed matter. I will present a new source in the mid-IR frequency range to study phonon dynamics in solids allowing for advanced pumping schemes in pump-probe experiments based on chirped difference frequency generation [1]. Being able to drive phonons across barriers in the energy potential landscape is crucial when aiming at permanent phase changes. Furthermore, I will take a closer look on the probe side of ultrafast experiments applying hard X-ray scattering to a charge-density-wave material [2]. Experiments performed at the LCLS show the effect of the choice of scattering vector when probing certain phonons, suggesting a route for selective phonon probes. I will then discuss permanent phase transitions in amorphous materials, applying X-ray diffraction in operando conditions and ex situ to gain a fundamental understanding in laser processing in transparent glasses [3].

[1] B. Liu, H. Bromberger, A. Cartella, T. Gebert, M. Först, and A. Cavalleri, Generation of Narrowband, High-Intensity, Carrier-Envelope Phase-Stable Pulses Tunable between 4 and 18 THz, Opt. Lett. 42, 129, 2017.
[2] L. Boie, Towards More Efficient and Specific Driving and Probing of Coherent Phonon Dynamics in Solids, ETH Zurich, 2022.
[3] G. Torun, T. Kishi, D. Pugliese, D. Milanese, and Y. Bellouard, Formation Mechanism of Elemental Te Produced in Tellurite Glass Systems by Femtosecond Laser Irradiation, Adv. Mater. 35, 2210446, 2023.