title: Direct slow-light excitation in photonic crystal waveguides forming ultra-compact splitters.
abstract: Based on a series of 1x2 beam splitters, novel direct excitation of slow-light from input- to output-region in photonic crystal waveguides is investigated theoretically and experimentally. The study shows that the slow-light excitation provides over 50 nm bandwidth for TE-polarized light splitting between two output ports, and co-exists together with self-imaging leading to ~20 nm extra bandwidth. The intensity of the direct excitation is qualitatively explained by the overlap integral of the magnetic fields between the ground input- and excited output-modes. The direct excitation of slow light is practically lossless compared with transmission in a W1 photonic crystal waveguides, which broadens the application-field for slow-light and further minimizes the size of a 1x2 splitter.
authors.affiliation: Interdisciplinary Nanoscience Center, Aarhus University, Ny Munkegade 120, DK-8000 Århus C, Denmark. minz@inano.dk
authors.forename: Min
authors.initials: M
authors.lastname: Zhang
authors.forename: Nathaniel
authors.initials: N
authors.lastname: Groothoff
authors.forename: Asger Christian
authors.initials: AC
authors.lastname: Krüger
authors.forename: Peixing
authors.initials: P
authors.lastname: Shi
authors.forename: Martin
authors.initials: M
authors.lastname: Kristensen