High transmission recovery of slow light in a photonic crystal waveguide using a hetero groupvelocity waveguide.
High transmission recovery of slow light in a photonic crystal waveguide using a hetero groupvelocity waveguide.
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DOI：
10.1364/oe.15.007974
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发表时间：
2007-06
期刊：
影响因子：
3.8
通讯作者：
N. Ozaki;Y. Kitagawa;Y. Takata;N. Ikeda;Yoshinori Watanabe;A. Mizutani;Y. Sugimoto;K. Asakawa
中科院分区：
文献类型：
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作者：
N. Ozaki;Y. Kitagawa;Y. Takata;N. Ikeda;Yoshinori Watanabe;A. Mizutani;Y. Sugimoto;K. Asakawa
提出了一种利用异质群速度（Ht-V(g)）的光子晶体波导（PC -WG）实现慢光高传输的方法，并进行了实验研究。Ht-V(g) WG由两个相同的高群速（H-V(g)） PC-WG之间的低群速（L-V(g)） PC-WG部分组成，旨在减少L-V(g) PC-WG的阻抗失配。在Ht-V(g) PC-WG中，即使在带隙附近，传输脉冲的透过率也会增加，而均匀PC-WG则随着脉冲波长接近带隙而逐渐降低。用互相关法测定Ht-V(g) PC-WG中L-V(g)区的组指数（n(g)）均在20以上。另一方面，与具有相同n(g) 17的均匀L-V(g) WG相比，Ht-V(g)结构的透射率恢复了约16dB。这种恢复主要是由于Ht-V(g)结构导致的耦合改善，约为12dB。这些结果表明Ht-V(g)结构在PC-WG中使用慢光的有效性，这将导致在基于pc的光学器件中的各种应用。
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.