Speaker
Description
Laser-induced transient grating (TG) spectroscopy, in which two crossed short laser pulses produce a spatially periodic material excitation whose dynamics are monitored via diffraction of a time-delayed probe pulse, is a well-established optical technique used to study a wide range of phenomena. The extension of this technique into the EUV and x-ray spectral ranges accomplished in the past decade [1-4] enabled TG periods down to single-digit nanometers. EUV/x-ray transient gratings have been used to study nanoscale thermal transport as well as bulk and surface coherent phonons with nanoscale wavelengths [2,4-6]. A more recent application is studying nanoscale transient gratings of magnetization [7] including generation of coherent magnons [8,9]. In this talk, I will briefly review recent progress in the EUV/x-ray TG spectroscopy and discuss some solved and unsolved mysteries encountered in these studies.
[1] F. Bencivenga et al., Nature 520, 205 (2015).
[2] F. Bencivenga et al., Sci. Adv. 5, eaaw5805 (2019).
[3] J. R. Rouxel et al., Nat. Photonics 15, 499 (2021).
[4] H. Li et al., Nature Phys. 22, 483 (2026).
[5] A. A. Maznev et al., Appl. Phys. Lett. 119, 044102 (2021).
[6] D. Fainozzi et al., Phys. Rev. Lett. 132, 033802 (2024).
[7] D. Ksenzov et al., Nano Lett. 21, 2905 (2021).
[8] P. R. Miedaner et al., Sci. Adv. 10, eadp6015 (2024).
[9] P. R. Miedaner et al., Phys. Rev. Lett. 136, 176701 (2026).
| Scientific Topics | Solid State Physics |
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