title: Slow light with large group index-bandwidth product in ellipse-hole photonic crystal waveguides.
abstract: In this study, we propose a new type of slow light photonic crystal waveguide structure to achieve wideband slow light with low dispersion. The waveguide is based on a triangular lattice ellipse-hole photonic crystal imposed simply by a selective altering of the locations of the holes adjacent to the line defect. Under a constant group index criterion of ±10% variation, when group indices are nearly constants of 54, 69, and 80, their corresponding bandwidths of the flat band reach 12.7, 10.0, and 8.6 nm around 1550 nm, respectively. A nearly constant large group index-bandwidth product of 0.44 is achieved for all cases. Low dispersion slow light propagation is confirmed by studying the relative temporal pulse-width spreading with the two-dimensional finite-difference time-domain method.
authors.forename: Xu
authors.initials: X
authors.lastname: Han
authors.forename: Tao
authors.initials: T
authors.lastname: Wang
authors.forename: Jian
authors.initials: J
authors.lastname: Tang
authors.forename: Bo
authors.initials: B
authors.lastname: Liu
authors.forename: BoYun
authors.initials: B
authors.lastname: Wang
authors.forename: Yu
authors.initials: Y
authors.lastname: He
authors.forename: Youjiang
authors.initials: Y
authors.lastname: Zhu