title: Optical filter with very large stopband (approximately 300 nm) based on a photonic-crystal vertical-directional coupler.
abstract: We have designed, fabricated, and demonstrated a vertical directional coupler based on the coupling between a polymer waveguide and a W1 photonic crystal waveguide. The filters have a bandwidth of approximately 2 nm within a stopband of Delta lambda approximately 300 nm and an on-chip insertion loss of 1 dB. This is the first (to our knowledge) demonstration of a filter with such a large stopband that overcomes the bandwidth limitation of existing filters.
authors.affiliation: School of Physics and Astronomy, University of St Andrews, St Andrews, Fife, KY169SS, UK. grande@deemail.poliba.it
authors.forename: M
authors.initials: M
authors.lastname: Grande
authors.forename: L
authors.initials: L
authors.lastname: O'Faolain
authors.forename: T P
authors.initials: TP
authors.lastname: White
authors.forename: M
authors.initials: M
authors.lastname: Spurny
authors.forename: A
authors.initials: A
authors.lastname: D'Orazio
authors.forename: T F
authors.initials: TF
authors.lastname: Krauss