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We introduce laboratory-scale magneto-optical imaging with sub–50-nm resolution using high-harmonic radiation.

We study extreme-ultraviolet wave propagation within optically thick nanostructures by means of high-resolution coherent diffractive imaging using high-harmonic radiation. Exit waves from different objects are reconstructed by phase retrieval algorithms, and are shown to be dominated by waveguiding within the sample. The experiments provide a direct visualization of extreme-ultraviolet guided modes, and demonstrate that multiple scattering is a generic feature in extruded nanoscale geometries. The observations are successfully reproduced in numerical and semi-analytical simulations.

We use high-sensitivity ultrafast high-harmonic spectroscopy to track coherent phonons in the charge-density wave phase of 1T-TiSe2. Using harmonics near the Ti-M-edge, we distinguish spectral signatures of the 3.3-THz amplitude mode and 6-THz optical phonons.

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