title: Bilayer Al wire-grids as broadband and high-performance polarizers.
abstract: We have fabricated, characterized and theoretically analyzed the performance of bilayer (or stacked) metallic wire-grids. The samples with 100 nm period were fabricated with extreme-ultraviolet interference lithography. Transmission efficiency over 50% and extinction ratios higher than 40 dB were measured in the visible range with these devices. Simulations using a finite-difference time-domain algorithm are in agreement with the experimental results and show that the transmission spectra are governed by Fabry-Perot interference and nearfield coupling between the two layers of the structure. The simple fabrication method involves only a single lithographic step without any etching and guarantees precise alignment and separation of the two wire-grids with respect to each other.
authors.forename: Yasin
authors.initials: Y
authors.lastname: Ekinci
authors.forename: Harun H
authors.initials: HH
authors.lastname: Solak
authors.forename: Christian
authors.initials: C
authors.lastname: David
authors.forename: Hans
authors.initials: H
authors.lastname: Sigg