title: Efficient light coupling for optically excited high-density metallic nanotip arrays.
abstract: Ultrafast electron pulses can be produced from sharp metallic tips illuminated by femtosecond near infrared laser pulses. Use of an array of metallic nanotips for high charge bunch generation and accelerator applications is also feasible but the small fraction of the emitter tip area limits the quantum efficiency. We therefore propose a submicron-pitch, high-density nanotip array device with a gate electrode, that can support surface-plasmon polaritons. From a theoretical analysis for a device with an asymmetric emitter position, a factor ~30 increased array quantum efficiency is demonstrated.
authors.affiliation: Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut , 5232 Villigen PSI, Switzerland. anna.mustonen@psi.ch
authors.forename: Anna
authors.initials: A
authors.lastname: Mustonen
authors.forename: Paul
authors.initials: P
authors.lastname: Beaud
authors.forename: Eugenie
authors.initials: E
authors.lastname: Kirk
authors.forename: Thomas
authors.initials: T
authors.lastname: Feurer
authors.forename: Soichiro
authors.initials: S
authors.lastname: Tsujino