Photoelectron emission control with polarized light in plasmonic metal random structures
- Physics Department, Portland State University, Portland, Oregon 97201 (United States)
We report on the possibility of switching the emission rate of photoelectrons by polarization changes in the plasmon excitation light. Photoelectron emission is strongly enhanced in the near-field of localized surface plasmons and occurs from areas with typical diameters of 20-70 nm. The underlying physical process involves excitation of a localized surface plasmon polariton with a femtosecond laser pulse, and a subsequent multi-photon photoemission process. The non-linearity of this process leads to a sharp polarization dependence that allows efficient switching of the emission. We demonstrate that a 90 deg. polarization change can result in on/off ratios of {approx}100 for electron emission.
- OSTI ID:
- 22027686
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 4 Vol. 99; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
Similar Records
Polarization-Directed Surface Plasmon Polariton Launching
Nonresonant enhancement of spontaneous emission in metal-dielectric-metal plasmon waveguide structures