title: High transmission recovery of slow light in a photonic crystal waveguide using a hetero groupvelocity waveguide.
abstract: High transmission of slow-light in a photonic crystal (PC) waveguide (WG) using a hetero group-velocity (Ht-V(g)) PC-WG was proposed and experimentally investigated. The Ht-V(g) WG, which comprises a low-group-velocity (L-V(g)) PC-WG section between two identical high-group- velocity (H-V(g)) PC-WGs, is designed to decrease the impedance mismatch of the L-V(g) PC-WG. The increase in transmittance of a propagating pulse was confirmed in the Ht-V(g) PC-WG even in the vicinity of the band-gap, whereas the homogeneous PC-WG showed a gradual decrease in transmittance with the pulse wavelength approaching the band-gap. The group index (n(g)) of the L-V(g) region in the Ht-V(g) PC-WG was measured by the cross-correlation method and attained a value above 20. On the other hand, the transmittance of the Ht-V(g) structure recovered approximately 16dB compared to the homogeneous L-V(g) WG having same n(g), 17. This recovery is mainly dominated by the coupling improvement due to the Ht-V(g) structure, around 12dB. These results indicate the effectiveness of the Ht-V(g) structure to use slow light in a PC-WG, which leads to various applications in PC-based optical devices.
authors: Nobuhiko
authors: N
authors: Ozaki
authors: Yoshinori
authors: Y
authors: Kitagawa
authors: Yoshiaki
authors: Y
authors: Takata
authors: Naoki
authors: N
authors: Ikeda
authors: Yoshinori
authors: Y
authors: Watanabe
authors: Akio
authors: A
authors: Mizutani
authors: Yoshimasa
authors: Y
authors: Sugimoto
authors: Kiyoshi
authors: K
authors: Asakawa