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Collective lattice dynamics determine essential aspects of condensed matter,such as elastic and thermal properties. These exhibit strong dependence on thelength-scale, reflecting the marked wavevector dependence of latticeexcitations. The extreme ultraviolet transient grating (EUV TG) approach hasdemonstrated the potential of accessing a wavevector range corresponding to the10s of nm length-scale, representing a spatial scale of the highest relevancefor fundamental physics and forefront technology, previously inaccessible byoptical TG and other inelastic scattering methods. In this manuscript we reporton the capabilities of this technique in the context of probing thermoelasticproperties of matter, both in the bulk and at the surface, as well asdiscussing future developments and practical considerations.

Extreme ultraviolet transient gratings: A tool for nanoscale photoacoustics