Ultrafast Nanooptical Near-Field Probing with Photoelectrons

摘要

Probing nanooptical near-fields is a major challenge in plasmonics. I will introduce a new experimental method utilizing ultrafast photoemission from plasmonic nanostructures that is capable of probing the maximum nanoplasmonic field enhancement in any metallic surface environment. Directly measured field enhancement values for various samples are in good agreement with detailed finite-difference time-domain simulations. Our results [1] establish ultrafast plasmonic photoelectrons as versatile probes for nanoplasmonic near-fields and deliver important insight on plasmon-plasmon coupling, as well.