Picosecond Switching using Resonant Nonlinearities in a Quantum Well Device

IF 1.1 Q4 QUANTUM SCIENCE & TECHNOLOGY
P. LiKamWa, A. Kan’an
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引用次数: 0

Abstract

Resonant nonlinearities in quantum well structures arise from exciton saturation and band-filling due to photogeneration of free carriers. Through the Kramers-Kronig’s relation, a corresponding change in refractive index occurs close to the bandgap energy where the absorption change occurs. The change in refractive index can effectively be used to produce optical switching in devices that can convert phase changes into intensity changes or directional switching1. Although the turn-on of carrier induced nonlinearities is effectively an instantaneous effect which follows the photon pulse, these photogenerated carriers tend to linger on well after the photon pulse has passed. The recovery time is usually governed by carrier relaxation times2,3 or carrier removal rates4. In this work, we demonstrate all-optical switching in a Y-junction device in which two control optical pulses are used for each switching event. The first control pulse flips the state of the switch while the second control pulse turns the switch back to its initial state. The switch dynamics is related to other carrier induced devices demonstrated by other independent researchers5,6.
在量子阱器件中使用共振非线性的皮秒开关
量子阱结构中的共振非线性是由自由载流子的光产生引起的激子饱和和带填充引起的。根据Kramers-Kronig关系,在发生吸收变化的带隙能量附近,折射率会发生相应的变化。折射率的变化可以有效地用于在可以将相位变化转换为强度变化或方向开关的器件中产生光开关1。虽然载流子诱导非线性的开启实际上是随光子脉冲而发生的瞬时效应,但这些光产生的载流子往往在光子脉冲通过后仍能很好地存在。恢复时间通常由载流子弛豫时间2,3或载流子去除率决定。在这项工作中,我们演示了在y结器件中的全光开关,其中每个开关事件使用两个控制光脉冲。第一控制脉冲翻转所述开关的状态,而第二控制脉冲将所述开关转回其初始状态。开关动力学与其他独立研究人员证明的其他载流子诱导器件有关5,6。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
1.80
自引率
22.20%
发文量
43
审稿时长
15 weeks
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