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Dispersive Properties of tunnelling—induced transparency in an asymmetric double quantum well 下载免费PDF全文
We have investigated the dispersive properties of tunnelling-induced transparency in asymmetric double quantum well structures where two excited states are coupled by resonant tunnelling through a thin barrier in a three-level system of electronic subbands. The intersubband transitions exhibit high dispersion at zero absorption, which leads to the slow light velocity in this medium as compared with that in vacuum (c=3×108). The group velocity in a specific GaAs/AlGaAs sample is calculated to be vg=c/4.30. This structure can be used to compensate for the dispersion and energy loss in fibre optical communications. 相似文献
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We propose a scheme of a bistable system with an electromagnetically induced grating and analyse the optical bistabilities in the system.The stationary equations describing the system have been derived.This bistable system shows typical hysteresis behaviour. 相似文献
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一种Bragg型声光双稳器件的双稳特性研究 总被引:1,自引:0,他引:1
本文报导了一种基于Bragg型衍射的声光双稳器件。声光晶体由行波场驱动,声场频率则由系统的反馈讯号控制。实验中,观察并记录了输出光强相对输入光强的双稳特性与固定偏置频率的关系,以及在不同输入光强条件下输出光强与偏置频率之间的双稳特性,这些实验结果与理论分析结果一致。 相似文献
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提出了由石墨烯和两对对称开口谐振环构成的等离激元诱导透明(PIT)超材料结构,该PIT超材料结构之间的耦合形式为暗-亮-暗模式.通过有限元方法模拟,观察到双PIT透明窗口,通过改变石墨烯的费米能级或者改变开口谐振环的几何参数来动态地调制PIT窗口.理论结果表明,当石墨烯与两对对称的开口谐振环之间的相互作用距离为0.5 μm、石墨烯费米能级为1.5 eV时,可得到最优的双透明窗口.双PIT效应在非线性器件、可调谐传感器、开关和慢光器件等方面有潜在的应用价值. 相似文献
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