Figure | Characterization of light-matter interactions in chiral metasurface by photo-induced near-field electron microscopy at femtosecond-nanometer scale. (IMAGE)
Caption
Figure | Characterization of light-matter interactions in chiral metasurface by photo-induced near-field electron microscopy at femtosecond-nanometer scale. a, Schematic diagram of 4D UEM with PINEM imaging capability for near-field measurement with high spatiotemporal resolution. b, Typical scanning electron microscopy images of an achiral and chiral Au metasurfaces. c, Wavelength-dependent changes of ellipticity ε of the transmitted light for the metasurfaces under horizontally polarized light illumination (680-830 nm). d, PINEM imaging results of the near-field distributions (t = 0 fs) in a single meta-atom of the achiral (top panel) and chiral (bottom panel) metasurfaces under fs laser excitation with different wavelengths. e, Simulated electric field distributions and simulated charge distributions for the chiral meta-atom at 810 nm. f, Schematic diagram illustrating the local symmetric and asymmetric near-field components within a chiral meta-atom. g, Probabilities of the electron-photon interaction intensity at +6 ħω of different localized near-fields versus delay time. h, Time-dependent PINEM energy-gain images at +6 ħω for the achiral (top panel) and chiral (bottom panel) meta-atoms.
Credit
Xuewen Fu et al.
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CC BY