Ultrafast all-optical polarization switching in Bragg-spaced quantum wells at 80K
Ultrafast all-optical polarization switching in Bragg-spaced quantum wells at 80K
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DOI：
10.1063/1.2433994
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发表时间：
2007-02
影响因子：
3.2
通讯作者：
W. J. Johnston;J. Prineas;A. Smirl
中科院分区：
文献类型：
--
作者：
W. J. Johnston;J. Prineas;A. Smirl
在80 K下，布拉格间隔量子威尔斯阱中实现了0.6THz的偏振开关，其光带宽为0.6THz，对比度大于30 dB，吞吐量为1.4%，开关能量密度为8μ Jscincm ~ 2，响应时间为皮秒。在该器件中，开关是通过使用大的自旋相关的非线性引起的圆偏振控制脉冲来改变线偏振信号脉冲的偏振状态。
A polarization switch is demonstrated in Bragg-spaced quantum wells at 80K that exhibits a 0.6THz optical bandwidth with a contrast ratio greater than 30dB, a throughput of ∼4%, a switching fluence of 8μJ∕cm2, and a pulse-width-limited picosecond response time. In this device, switching is achieved by using large spin-dependent nonlinearities induced by a circularly polarized control pulse to alter the polarization state of a linearly polarized signal pulse.