Publications by authors named "John H Gaida"
In electron microscopy, detailed insights into nanoscale optical properties of materials are gained by spontaneous inelastic scattering leading to electron-energy loss and cathodoluminescence. Stimulated scattering in the presence of external sample excitation allows for mode- and polarization-selective photon-induced near-field electron microscopy (PINEM). This process imprints a spatial phase profile inherited from the optical fields onto the wave function of the probing electrons.
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- Topological states of matter are intriguing due to their unique physics and stability, but creating these states quickly is challenging.
- Researchers demonstrated the rapid emergence of a topological phase with multiple magnetic skyrmions within picoseconds, using real-time soft X-ray scattering after activating with infrared laser.
- A transient topological fluctuation state, influenced by a specific magnetic field, helps lower the energy barrier for this rapid formation, offering insights into topological transitions and potential for ultrafast switching in various materials.
We introduce a broadband single-pixel spectro-temporal fluorescence detector, combining time-correlated single photon counting (TCSPC) with Fourier transform (FT) spectroscopy. A birefringent common-path interferometer (CPI) generates two time-delayed replicas of the sample's fluorescence. Via FT of their interference signal at the detector, we obtain a two-dimensional map of the fluorescence as a function of detection wavelength and emission time, with high temporal and spectral resolution.
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