title: Size and shape dependent few-cycle near-field dynamics of bowtie nanoantennas.
abstract: Metal nanostructures can transfer electromagnetic energy from femtosecond laser pulses to the near-field down to spatial scales well below the optical diffraction limit. By combining few-femtosecond laser pulses with photoemission electron microscopy, we study the dynamics of the induced few-cycle near-field in individual bowtie nanoantennas. We investigate how the dynamics depend on antenna size and exact bowtie shape resulting from fabrication. Different dynamics are, as expected, measured for antennas of different sizes. However, we also detect comparable dynamics differences between individual antennas of similar size. With Finite-difference time-domain simulations we show that these dynamics differences between similarly sized antennas can be due to small lateral shape variations generally induced during the fabrication.
authors.forename: Eleonora
authors.initials: E
authors.lastname: Lorek
authors.forename: Erik
authors.initials: E
authors.lastname: Mårsell
authors.forename: Arthur
authors.initials: A
authors.lastname: Losquin
authors.forename: Miguel
authors.initials: M
authors.lastname: Miranda
authors.forename: Anne
authors.initials: A
authors.lastname: Harth
authors.forename: Chen
authors.initials: C
authors.lastname: Guo
authors.forename: Robin
authors.initials: R
authors.lastname: Svärd
authors.forename: Cord L
authors.initials: CL
authors.lastname: Arnold
authors.forename: Anne
authors.initials: A
authors.lastname: L'Huiller
authors.forename: Anders
authors.initials: A
authors.lastname: Mikkelsen
authors.forename: Johan
authors.initials: J
authors.lastname: Mauritsson