Fig. 1. Schematics of different PEEM systems. (a) Initial photoemission microscope^[7]; (b) PEEM system designed by Engel^[8]; (c) principle diagram of PEEM for measurement of surface photoemission in real space; (d) principle diagram of PEEM for measurement of surface photoemission in reciprocal space; (e) principle diagram of PEEM for energy analysis of photoemission electrons^[

Fig. 2. Schematic of ultrafast PEEM system

Fig. 3. Near-field mapping of gold nanoparticles (Au NPs) by PEEM^[6]. (a) SEM image of Au NPs on Nb-doped TiO₂ substrate; (b) extinction spectrum of Au NPs; (c) PEEM image of Au NPs upon irradiation by femtosecond laser pulse with central wavelength of around 800 nm; (d) relationship between excitation laser power and integral photoemission intensity

Fig. 4. Near-field imaging. (a) PEEM image of Au nanoblock resonantly excited by fs-laser^[16]; (b) PEEM image of Au nanoblock simultaneously irradiated by fs-laser and UV light^[16]; (c) PEEM image of dimer resonantly excited by fs-laser^[6]; (d) PEEM image of dimer simultaneously irradiated by fs-laser and UV light^[6

Fig. 5. Near-field spectral property of Au nanoblocks upon oblique incidence^[16]. (a) Photoemission (PE) intensity as a function of excitation wavelength for both p- and s- polarized light with normalization done for each curve; (b) PE intensity as a function of excitation wavelength for both p- and s- polarized light with both curves normalized for peak in curve for p-pol; (c) PEEM images obtained at peak wavelength for quadrupole and inset indicating n

Fig. 6. Near-field spectrum of dolmen structure^[19]. (a) Photoemission (PE) intensity as a function of excitationwavelength; (b) UV-PEEM image; (c)-(e) three PEEM images obtained at three characterized wavelengths indicated in (a)

Fig. 7. Optical path for interferometric pump-probe measurement

Fig. 8. Time-resolved PEEM measurements of Au nanoblocks upon oblique incidence. (a) Reflection spectra of two Au nanoblocks for time-resolved PEEM measurement; (b) corresponding evolution of photoemission signal with phase delay^[6]; (c) photoemission intensity for dipole mode as a function of delay time between pump and probe pulses; (d) photoemission intensity for quadrupole mode as a function of delay time between pump and probe pulses^[

Fig. 9. Time-resolved PEEM measurements of strong coupling plasmonic nanostructures^[22]. (a) Sectional view of sample imaged by scanning transmission electron microscope and inset indicating top view of sample imaged by scanning electron microscope; (b) evolution of dephasing time against detuning between two modes