Controllable optical bistability in a four-subband semiconductor quantum well system

Controllable optical bistability in a four-subband semiconductor quantum well system
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四子带半导体量子阱系统中的可控光学双稳态

DOI:
10.1103/physrevb.75.155329
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发表时间:
2007-04
期刊:
影响因子:
3.7
通讯作者:
Jia-Hua Li
Jia-Hua Li
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Jia-Hua Li

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研究了非对称双量子阱(QWS)中基于子带跃迁的光学双稳(OB)行为,在QWS中可以观察到隧道诱导的量子干涉。该系统通过单向环形腔与探测光场和控制光场相互作用。结果表明,通过调节隧穿耦合强度、法诺型干涉和控制场强度,可以有效地控制OB。还讨论了探测场和控制场的频率失谐对电子OB行为的影响。这一研究可用于半导体量子波系统的优化设计,以实现快速、低阈值的全光开关,由于其设计灵活、干扰强度可控,比原子系统的全光开关更具实用性。
We study optical bistability (OB) behavior based on intersubband transitions in asymmetric double quantum wells (QWs) where tunneling-induced quantum inference can be observed. The system interacts with a probe-laser field and a control laser field by means of a unidirectional ring cavity. We show that OB can be controlled efficiently by tuning the coupling strength of the tunneling, the Fano-type interference, and the intensity of the control field. The influence of the frequency detuning of the probe and control fields on the electronic OB behavior is also discussed. This investigation can be used for the optimal design of semiconductor QW systems to achieve fast and low-threshold all-optical switches, which is much more practical than that in an atomic system because of its flexible design and the controllable interference strength.
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