Year: 2024
Type: article
Abstract: In this Letter we demonstrate the use of plasmonic focusing in conjunction with nonlinear photoemission to develop geometrically flat nanoscale electron sources with less than 40 pm-rad root mean squared (rms) normalized transverse emittance. Circularly polarized light is incident on a gold Archimedean spiral structure to generate surface-plasmon polaritons that interfere coherently at the center resulting in a 50 nm rms emission area. Such a nanostructured flat surface enables simultaneous spatiotemporal confinement of emitted electrons at the nanometer and femtosecond level and can be used as an advanced electron source for high-repetition-rate ultrafast electron diffraction and microscopy experiments as well as the next generation of miniaturized particle accelerators.
Source: Physical Review Letters
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
Awards: Center for Bright Beams, HIGH BRIGHTNESS PHOTOCATHODES IN PHOTOINJECTORS, CONTROL OF BRIGHT ELECTRON BEAMS AT SMALL SPATIOTEMPORAL SCALES FOR PROBING MATERIALS FAR FROM EQUILIBRIUM, ON-CHIP INTEGRATED PHOTONICS BASED PHOTOCATHODES, HIGH BRIGHTNESS PHOTOCATHODES IN PHOTOINJECTORS, CONTROL OF BRIGHT ELECTRON BEAMS AT SMALL SPATIOTEMPORAL SCALES FOR PROBING MATERIALS FAR FROM EQUILIBRIUM
OpenAlex ID: W4403835121