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SUMMARY:Laser harmonic generation in chiral media: a beat-wave approach
DTSTART:20261014T103000Z
DTEND:20261014T113000Z
DTSTAMP:20261009T015300Z
UID:indico-event-1945@indico.stfc.ac.uk
DESCRIPTION:Speakers: Raoul Trines (CLF)\n\nIn recent years\, we have deve
 loped a beat-wave approach to laser harmonic generation in nonlinear media
 . In this approach\, all Fourier spectra take the form of regular grids [1
 ]. This enables many extensions\, such as the easy identification of harmo
 nic frequency combs [2] and a natural connection with the symmetry theory 
 of crystallography [3]. In this work\, we extend our model to the nonlinea
 r optical response of isotropic chiral media (molecules with left- and rig
 ht-handed forms) driven by locally chiral light [4]\, in which the tip of 
 the electric-field vector draws a chiral Lissajous figure in time. As in o
 ur earlier work on laser-solid interactions [1]\, the medium is represente
 d by a zero-frequency (DC) driving mode. We show how a chiral DC mode (sen
 sitive to the "handedness" of the medium) can be derived from the interact
 ion of synthetic chiral light with a chiral medium. The beating between th
 is DC mode and the EM fields then leads to a regular harmonic spectrum wit
 h alternating chiral and achiral modes. We will derive the criteria for th
 ese modes to overlap in Fourier space\, so they can combine to yield enant
 io-sensitive interference patterns or line intensities. Finally\, we will 
 apply our framework to a variety of existing results [5-8] to validate its
  predictions. [1] Trines et al.\, Nature Comms. 15\, 6878 (2024). [2] Trin
 es et al.\, Phys. Rev. Res. 8\, 013241 (2026). [3] Trines et al.\, arXiv:2
 507.08635 (2025). [4] Trines et al.\, arXiv:2604.08354 (2026). [5] Ayuso e
 t al.\, Nature Phot. 13\, 866 (2019). [6] Ayuso et al.\, Nature Comms. 12\
 , 3951 (2021). [7] Mayer et al.\, Nature Phot. 18\, 1155 (2024). [8] Vogwe
 ll et al.\, Science Adv. 9\, eadj1429 (2023).\n \n***********************
 ***\nAbout the speaker:\n \nRaoul Trines is a Senior Research Scientist a
 t the Central Laser Facility\, Rutherford Appleton Laboratory (RAL) and a 
 Visiting Researcher at Oxford University’s Physics Department. He obtain
 ed his PhD from Eindhoven University of Technology in 2003. His PhD resear
 ch focused on laser acceleration of electrons in plasma. After working as 
 a postdoctoral fellow in the Space Science and Technology Department at RA
 L (2003-2005)\, he has worked as a researcher at the Central Laser Facilit
 y since 2005\, conducting theoretical and numerical research on laser-plas
 ma interactions. His current research programme focuses on the nonlinear i
 nteraction of lasers with low-density plasma\, especially laser-plasma ins
 tabilities such as Raman and Brillouin amplification. More recently\, he h
 as also explored the use of higher-order laser modes (Laguerre-Gaussian or
  Hermite-Gaussian) in laser-plasma instabilities and in laser-plasma high-
 harmonic generation.\n \n\nhttps://indico.stfc.ac.uk/event/1945/
LOCATION:R61 CR03 (RAL)
URL:https://indico.stfc.ac.uk/event/1945/
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