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Because silver has epsilon-near-zero (ENZ) in the near-UV spectral region,its optical response is expected to be dominantly plasmonic andnonperturbatively nonlinear. The ENZ properties of Ag have made it the materialof choice for investigation of plasmonic optical effects in physics, chemistry,optics, and nanotechnology. We investigate the nonlinear angle-resolvedtwo-photon photoemission (2PP) spectroscopy of Ag(111) surface in the ENZregion. In addition to the well-understood and documented spectroscopicfeatures of Einsteinian photoemission involving dipole excitations of thesingle-particle occupied and unoccupied surface states, 2PP spectra possessother distinct features where the optical fields excite or are modified by thecollective virtual and real plasmon excitations.

Excitation of two-photon photoemission where epsilon is near zero on Ag(111)