Article Dans Une Revue Nature Communications Année : 2023

Lorentz microscopy of optical fields

Résumé

Abstract 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. Here, we introduce Lorentz-PINEM for the full-field, non-invasive imaging of complex optical near fields at high spatial resolution. We use energy-filtered defocus phase-contrast imaging and iterative phase retrieval to reconstruct the phase distribution of interfering surface-bound modes on a plasmonic nanotip. Our approach is universally applicable to retrieve the spatially varying phase of nanoscale fields and topological modes.

Dates et versions

hal-04296151 , version 1 (20-11-2023)

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Citer

John Gaida, Hugo Lourenço-Martins, Sergey Yalunin, Armin Feist, Murat Sivis, et al.. Lorentz microscopy of optical fields. Nature Communications, 2023, 14 (1), pp.6545. ⟨10.1038/s41467-023-42054-3⟩. ⟨hal-04296151⟩
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