Enhanced third-order nonlinear effects in slow-light photonic-crystal slab waveguides of line-defect
Enhanced third-order nonlinear effects in slow-light photonic-crystal slab waveguides of line-defect
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DOI：
10.1364/oe.17.007206
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发表时间：
2009-04-27
期刊：
影响因子：
3.8
通讯作者：
Asakawa, Kiyoshi
中科院分区：
文献类型：
--
作者：
Inoue, Kuon;Oda, Hisaya;Asakawa, Kiyoshi
实验研究了三阶非线性光学现象的增强，研究了AlGaAs基光子晶体平板波导小群速度线缺陷导模中由于光克尔效应和双光子吸收引起的自相位调制。我们发现，当接近带边时，由于V-g较小，相移Δ phi或名义克尔常数n（2）'和TPA系数β显著增大，使得它们与（V-g）（-2）成正比;非线性折射率n（2）与V-g（-1）成正比增大。我们还观察到，由于这种增强以及一个非常小的横截面积，诱导π相移所需的能量是非常小的，是一个订单的几个pJ为5 ps的光脉冲和0.5毫米长的样品。基于这些结果，我们讨论了开发超快和超小型全光开关的可能性，由于交叉相位调制。(C)2009年美国光学学会
We experimentally studied enhancement of the third-order nonlinear optical phenomena, i.e., self-phase modulation due to optical Kerr effect and two-photon absorption (TPA) in a small group-velocity (V-g) line-defect guided-mode of AlGaAs-based photonic-crystal slab waveguide. We found that the phase shift Delta phi or nominal Kerr constant n(2)' and TPA coefficient beta were strikingly enhanced due to small V-g as the band edge was approached, such that they were proportional to (V-g)(-2); the nonlinear refractive index n(2) is enhanced proportional to V-g(-1). We also observed that owing to this enhancement as well as an extremely small cross-section area, the energy required for inducing pi-phase shift was very small, being of an order of a few pJ for 5 ps optical pulse and for a 0.5-mm long sample. Based on those results, we discuss the possibility of developing ultra-fast and ultrasmall all-optical switches that operate due to cross-phase modulation. (C) 2009 Optical Society of America