title: Free-field characterization via directional transmission through a nanoaperture.
abstract: : We propose a scheme based on extraordinary transmission of light through a single nanoaperture, surrounded by periodic corrugations, for direct characterization of focal-region optical fields with subwavelength-scale structure. We describe the design of the device on the basis of rigorous diffraction theory and fabricate a prototype using a process that involves electron beam lithography, dry etching, and template stripping. First experimental results performed with a transmission-type confocal optical microscope demonstrate the potential of the method.
authors.affiliation: Department of Physics and Mathematics, University of Eastern Finland, P,O, Box 111, Joensuu FI-80101, Finland. rahomaki@kth.se.
authors.forename: Jussi
authors.initials: J
authors.lastname: Rahomäki
authors.forename: Heikki J
authors.initials: HJ
authors.lastname: Hyvärinen
authors.forename: Shakil
authors.initials: S
authors.lastname: Rehman
authors.forename: Jari
authors.initials: J
authors.lastname: Turunen