Ultrafast high-contrast all-optical switching using spin polarization in low-temperature-grown multiple quantum wells
Ultrafast high-contrast all-optical switching using spin polarization in low-temperature-grown multiple quantum wells
复制标题
在低温生长的多量子阱中利用自旋极化实现超快高对比度全光切换
DOI：
10.1063/1.1324724
复制
发表时间：
2000
影响因子：
4
通讯作者：
H. Iwamura
中科院分区：
文献类型：
--
作者：
R. Takahashi;H. Itoh;H. Iwamura
我们已经证明了一个超快的高对比度的表面反射全光开关使用自旋偏振计划。该器件采用低温生长的掺Be应变InGaAs/InAlAs多量子威尔斯阱结构。由于超快电子俘获，它具有300 fs的光响应。在泵浦脉冲能量为4和14 pJ时，开关比分别达到30和40 dB以上。此外，我们还通过在两个不同的点处理信号脉冲的两个正交分量，获得了偏振不敏感的操作。
We have demonstrated an ultrafast high-contrast surface-reflection all-optical switch using a spin-polarization scheme. The device is made with low-temperature-grown Be-doped strained InGaAs/InAlAs multiple quantum wells. It has a photoresponse of 300 fs due to ultrafast electron trapping. The on/off ratios have been drastically improved by more than 20 dB, and reached over 30 and 40 dB at pump pulse energies of 4 and 14 pJ, respectively. Furthermore, we have obtained polarization insensitive operation by handling the two orthogonal components of the signal pulse at two different points.