Basic research on the optical pulse transmission and nonlinear phenomina in the photonic crystal slab waveguide

光子晶体板条波导中光脉冲传输及非线性现象的基础研究

基本信息

批准号：
18360030
负责人：
ASAKAWA Kiyoshi
金额：
$ 9.25万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18360030/
关键词：
Photonic crystal waveguide Nonlinear optics Optical Kerr effect Self-phase modulation Stimulated Raman scatterin Ultra-small all-optical switch Ultra-fast speed Low consumption enegy

项目摘要

It is well known that two-dimensional (2D) photonic-crystal (PC) slab waveguides (WGs) exhibit the noticeable light propagation characteristics. A typical example is that the light can pass through an abruptly bent corner of those line-defect WGs without any appreciable loss, resulting in being very attractive for ultra-small and low-energy optical integrated circuits (PIC). This is caused by the fact that the PC-slab WG has the advantage of tight light confinement vertically due to total internal reflection and laterally due to photonic band gap (PBG) effect, respectively. Moreover, that the group velocity vg^<WG> is small makes the power inside the WG larger by a factor n_g= (vg^<0>/vg^<WG>), being very advantageous to optical nonlinear (ONL) phenomena. So far, passive PC components have already been successfully developed, active components such as all-optical switch, buffer memory and optical amplifier have seldom been developed except a few cases. One of the best ways to develop u … More ltra-fast active components is to make efficient use of ONL phenomena such as stimulated Raman scattering (SRS) and self-or cross-phase-modulation (SPM or XPM) due to instantaneous optical Kerr effect. AlGaAs-based PC WGs have the advantage over the Si-based ones of avoiding two-photon absorption (TPA). Different from the case of Si, the TPA in the AlGaAs is practically avoided by increasing Al-content, thus increasing the electronic band gap.In this work, we first observed the SPM-induced spectral broadening for PC-slab WGs in a wavelength range from 1,460 to 1,535 nm; the SPM (or a phase shift) due to the nonlinear refractive index n_2 leads to a marked spectral evolution as the input pulse power P_<in> is increased. We have examined the spectrum of the light-pulse transmitted through an Al_<0.26>Ga_<0.74>As-based sample, by varying the power of incident pulse with T_0 (pulse duration) =1.6 ps. As a result, we found that the spectrum gets broader with increase of P_<in>, and on further increasing, develops a double-peak structure, corresponding to a phase shift of 1.3 π. The power required for this shift is estimated to be as small as 〜1.4 W for a 1.0 mm-long sample. The estimated n_2-value is 〜1.3 X 10^<-13>cm^2/W. On the other hand, the SRS has the potential for developing a light amplifier and a compact light source. Until now, however, no experimental work has been reported yet on SRS for the PC-slab WG In this connection we mention that several successful works on SRS have already been reported on GaP-based-and Si-based wire-WGs. So, we performed a pump-probe experiment of SRS amplification of light around 1,550 nm in an Al_<0.26>Ga_<0.74>As-based PhC-slab WG As a result, we observed more than 6 dB signal amplification with pump pulse energy of 22 pJ in an effective sample-length of 〜0.5 mm, which corresponds to a net gain of 〜3 dB. This result encourages us to develop an ultra-fast all-optical switch in future. Less

众所周知，二维（2D）光子晶体（PC）平板波导（WG）表现出显着的光传播特性，一个典型的例子是光可以穿过那些线缺陷WG的突然弯曲的角。任何明显的损失，导致对超小型和低能量光学集成电路（PIC）非常有吸引力，这是由于 PC-slab WG 具有严格光限制的优势。垂直方向上由于全内反射，横向上由于光子带隙 (PBG) 效应，此外，群速度 vg^<WG> 较小，使得 WG 内的功率增大 n_g= (vg^<0) 倍。 >/vg^<WG>)，对光学非线性(ONL)现象非常有利，迄今为止，无源PC器件已经研制成功，而全光开关、缓冲存储器和光放大器等有源器件却很少被开发出来。除了一个在少数情况下，开发超快有源元件的最佳方法之一是有效利用 ONL 现象，例如受激拉曼散射 (SRS) 和自相位调制或交叉相位调制（SPM 或 XPM）。基于 AlGaAs 的瞬时光学克尔效应比基于 Si 的 PC WG 具有避免双光子吸收 (TPA) 的优点，与 Si 的情况不同，AlGaAs 中的 TPA 实际上可以通过增加来避免。 Al 含量，从而增加电子带隙。在这项工作中，我们首先观察到 SPM 引起的 PC 板 WG 在 1,460 至 1,535 nm 波长范围内由于 SPM（或相移）而引起的光谱展宽；随着输入脉冲功率 P_<in> 的增加，非线性折射率 n_2 会导致显着的光谱演化。 Al_<0.26>Ga_<0.74>As基样品，通过改变入射脉冲的功率，T_0（脉冲持续时间）=1.6 ps，我们发现光谱随着P_<in>的增加而变宽，并且当进一步增加时，会形成双峰结构，对应于 1.3 π 的相移，对于 1.0 毫米长的材料，该相移所需的功率估计小至约 1.4 W。估计的 n_2 值约为 1.3 X 10^<-13>cm^2/W 另一方面，SRS 具有开发光放大器和紧凑光源的潜力。 PC-slab WG 的 SRS 实验工作已经有报道。在这方面，我们提到，基于 GaP 和 Si 的线 WG 已经报道了一些成功的 SRS 工作，因此，我们进行了泵浦探针。实验在 Al_<0.26>Ga_<0.74>As 基 PhC 板 WG 中对 1,550 nm 左右的光进行 SRS 放大结果，我们在有效样本长度内观察到泵浦脉冲能量为 22 pJ 时信号放大超过 6 dB约 0.5 毫米，相当于约 3 dB 的净增益。这一结果鼓励我们在未来开发超快速全光开关。较少的

项目成果

期刊论文数量（8）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Observation of Raman Scattering in GaAs photonic-crystal slab waveguides

GaAs 光子晶体板波导中拉曼散射的观察

DOI：
发表时间：
2006
期刊：
Optics Express 14
影响因子：
0
作者：
Hisaya Oda;Kuon Inoue;Naoki Ikeda;Yoshimasa Su ig moto;and Kivoshi Asakawa,
通讯作者：
and Kivoshi Asakawa,

Self-phase modulation in photonic-crystal-slab line-defect waveguides

DOI：
10.1063/1.2746068
发表时间：
2007-06
期刊：
Applied Physics Letters
影响因子：
4
作者：
H. Oda;Kuon Inoue;Y. Tanaka;N. Ikeda;Y. Sugimoto;H. Ishikawa;K. Asakawa
通讯作者：
H. Oda;Kuon Inoue;Y. Tanaka;N. Ikeda;Y. Sugimoto;H. Ishikawa;K. Asakawa

Light/matter optical nonlinear interaction in the photonic crystal slab waveguide

光子晶体板波导中的光/物质光学非线性相互作用

DOI：
发表时间：
2007
期刊：
Toyota Research Report vol.90(23)
影响因子：
0
作者：
Hasaya. Oda;Kuon Inoue;Yu Tanaka;Naoki Ikeda;Yoshimasa Sugimoto;Hiroshi;Ishikawa;and Kiyoshi Asakawa;Kuon Inoue
通讯作者：
Kuon Inoue

Observation of self-phase modulation in AlGaAs photonic-crystal slab waveguides

AlGaAs 光子晶体板波导中自相位调制的观察