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We crossed two femtosecond extreme ultraviolet (EUV) pulses in a beta - Ga2O3(001) single crystal to create transient gratings (TG) of light intensity withsub-100 nm spatial periodicity. The EUV TG excitation launches phonon modes,whose dynamics were revealed via the backward diffraction of a third,time-delayed, EUV probe pulse. In addition to the modes typically observed inthis kind of experiment, the phase-matching condition imposed by the TG,combined with the sharp penetration depth of the EUV excitation pulses,permitted to generate and detect phonons with a wavevector tangibly larger(approximately 1 nm-1) than the EUV TG one, via stimulated Brillouinback-scattering (SBBS) of the EUV probe. While SBBS of an optical probe wasreported in previous EUV TG experiments, the extension of SBBS to shortwavelength radiation can be used as a contact-less experimental tool forfilling the gap between the wavevector range accessible through inelastic hardX-ray and thermal neutron scattering techniques, and the one accessible throughBrillouin scattering of visible and UV light.

Stimulated Brillouin scattering at 1 nm-1 wavevector by extreme ultraviolet transient gratings