Frequency and Polarization Characteristics of Correlated Photon-Pair Generation Using a Silicon Wire Waveguide
Frequency and Polarization Characteristics of Correlated Photon-Pair Generation Using a Silicon Wire Waveguide
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DOI：
10.1109/jstqe.2009.2023338
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发表时间：
2010-01-01
影响因子：
4.9
通讯作者：
Itabashi, Sei-ichi
中科院分区：
文献类型：
--
作者：
Harada, Ken-ichi;Takesue, Hiroki;Itabashi, Sei-ichi
我们报道了在硅线波导中产生的相关光子对的频率和偏振特性。我们证实了相关光子对产生的带宽至少为>2.8 THz。此外，我们进行了一个经典的四波混频实验，使用强泵浦和空闲光来估计相关光子对产生的带宽。结果表明，在类似于12太赫兹的带宽上产生光子对是可能的。我们还发现水平偏振模式下的信号和空闲光子的产生效率远高于垂直偏振模式下的。这可能是由于两种极化模式的群指数和有效截面积的效率较大所致。此外，垂直偏振模式下相关光子对产生的带宽近似于+/- 1太赫兹，比水平偏振模式下的带宽窄得多。两种偏振模式的带宽差表明，垂直偏振模式的SWW色散明显大于水平偏振模式。然后，我们证实了自发拉曼散射在SWW中产生的噪声光子被抑制到低于我们设置的检测极限。
We report the frequency and polarization characteristics of correlated photon pairs generated in a Si wire waveguide (SWW). We confirmed that the bandwidth for correlated photon-pair generation was at least >2.8 THz. Moreover, we carried out a classical four-wave mixing experiment using strong pump and idler lights to estimate the bandwidth for correlated photon-pair generation. The results indicated that it is possible to generate photon pairs over a bandwidth as large as similar to 12 THz. We also showed that the generation efficiencies of the signal and idler photons for the horizontal polarization mode were much higher than those for the vertical polarization mode. This is probably caused by the large efficiencies in the group indexes and the effective cross-sectional areas for the two polarization modes. Furthermore, the bandwidth for the correlated photon-pair generation in the vertical polarization mode was similar to +/- 1 THz, and this was much narrower than that for the horizontal polarization mode. The difference between the bandwidths of the two polarization modes indicates that the SWW dispersion for the vertical polarization mode is significantly larger than that for the horizontal polarization mode. We then confirmed that the noise photons generated by spontaneous Raman scattering in an SWW were suppressed to below the detection limit of our setup.