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引入正弦平方势来描述掺杂超晶格由于交替掺杂引起的导带周期性调制,并提出了一种获得光学双稳态的新概念。指出了只须在超晶格量子阱的两端加上一个直流电场和交变电场,便可以用它作为光学双稳态器件。在经典力学框架内和小振幅近似下,考虑到运动阻尼和外场作用,粒子运动方程化为了具有硬弹簧特性的Duffing方程。用摄动法找到了系统的近似解,并分析了共振线附近粒子的运动行为与系统的稳定性。结果表明,粒子的振幅平方与外场振幅平方的关系曲线出现了后弯现象,正是这个后弯现象决定了系统存在双稳态,也正是这个双稳态效应决定了掺杂超晶格可望作为光子或光电子技术中新的记忆元件或存储元件。
The sine-squared potential is introduced to describe the periodical modulation of the conduction band due to the alternating doping of the doped superlattices, and a new concept of optical bistability is proposed. It is pointed out that it can be used as an optical bistable device by simply adding a DC electric field and an alternating electric field to both ends of the superlattice quantum well. In the framework of classical mechanics and small amplitude approximations, the particle motion equations are formulated as Duffing equations with hard spring properties, considering the damping of the motion and the effects of the external field. The perturbation method is used to find the approximate solution of the system, and the particle’s motion behavior and the stability of the system are analyzed. The results show that the curve of the squared amplitude of the particle with the square of the amplitude of the external field shows the phenomenon of backcurvature. It is this backbending phenomenon that determines the bistability of the system. It is also this bistable effect that determines the doping superlattice As a new photonic or optoelectronic technology, memory or storage elements.