title: Avoided-crossing-based liquid-crystal photonic-bandgap notch filter.
abstract: We demonstrate a highly tunable deep notch filter realized in a liquid-crystal photonic-bandgap (LCPBG) fiber. The filter is realized without inducing a long-period grating in the fiber but simply by filling a solid-core photonic-crystal fiber with a liquid crystal and exploiting avoided crossings within the bandgap of the LCPBG fiber. The filter is demonstrated experimentally and investigated using numerical simulations. A high degree of tuning of the spectral position of the deep notch is also demonstrated.
authors.affiliation: COM-DTU Department of Communications, Optics and Materials, Technical University of Denmark, DK-2800, Denmark. dno@com.dtu.dk
authors.forename: Danny
authors.initials: D
authors.lastname: Noordegraaf
authors.forename: Lara
authors.initials: L
authors.lastname: Scolari
authors.forename: Jesper
authors.initials: J
authors.lastname: Laegsgaard
authors.forename: Thomas
authors.initials: T
authors.lastname: Tanggaard Alkeskjold
authors.forename: Giovanni
authors.initials: G
authors.lastname: Tartarini
authors.forename: Elena
authors.initials: E
authors.lastname: Borelli
authors.forename: Paolo
authors.initials: P
authors.lastname: Bassi
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.forename: Shin-Tson
authors.initials: ST
authors.lastname: Wu