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光学双稳态研究20年 总被引:3,自引:0,他引:3
综述了光学双稳态的概念和理论以及光学双稳态器件的分类和材料研究。重点介绍了半导体光双稳器件研究的发展,并且指出了光学双稳态研究的最新进展、应用前景和目前的困难。 相似文献
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针对双稳态压电悬臂梁发电系统进行了动力学建模与分析.首先建立了能引发系统双稳态现象的磁力模型,给出了两磁铁之间磁力的数学表达式;其次建立了压电悬臂梁发电系统的集中参数模型,得到了系统发生双稳态现象时磁铁之间的距离范围;通过数值计算分析了系统的响应特性,发现双稳态运动大大提高了系统的频率响应范围,并且系统在低激励频率和低激励幅值下能发生大幅运动,而激励幅值越大,系统具有越高的能量逃离势阱产生大幅运动;最后通过实验对数值计算结果进行了验证.研究结果为双稳态压电悬臂梁发电系统的设计与应用提供了理论依据. 相似文献
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本文首次提出一种由相干度非线性调制得到的新型光学双稳态——空间双稳态及其作用无耦合和有交叉耦合情况下,经γ/υ和υ/ν变换反馈可得到多种形式的双稳态,且给出了几种情况下的稳态特性方程、参数选择区域以及翻转条件等. 相似文献
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双稳态俘能系统的运动常常会陷入单个势能阱中, 导致俘能效率降低. 为了解决这个问题, 本文提出了一类带碰撞的磁斥力双稳态压电振动能量采集系统. 建立了该碰撞双稳态系统的机电耦合方程, 分析了碰撞对双稳态系统动力学特性的影响. 研究了确定性激励和低强度随机激励下碰撞对系统响应特性和俘能效率的影响. 结果表明: 简谐激励下, 碰撞能够使得原双稳态系统的单阱小幅周期运动转变为双阱间的大幅运动, 从而有效地提高输出功率. 得到了低强度随机激励下, 不同碰撞间隙对系统动力响应特性和输出功率的影响规律. 对一个给定的随机激励, 存在一个最优的碰撞间隙, 此时碰撞能够将原双稳态系统单阱内的随机运动转化为频繁的双阱跳跃, 出现大幅值运动, 从而大幅提高了系统的俘能效率. 相似文献
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对一种有着单重态和三重态的典型的有机物的四能级系统的光学双稳进行了研究。由密度矩阵的速率方程近拟推导出了光学双稳的状态方程。对单重态和三重态吸收或色散情况下的双稳情况用数值解的方法进行了讨论。文中分析了单重态和三重态的合作参数、原子失谐参数和腔失谐参数对双稳的影响。 相似文献
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Influence of Fano interference and incoherent processes on optical bistability in a four-level quantum dot nanostructure 下载免费PDF全文
Role of Fano interference and incoherent pumping field on optical bistability in a four-level designed In Ga N/Ga N quantum dot nanostructure embedded in a unidirectional ring cavity are analyzed. It is found that intensity threshold of optical bistability can be manipulated by Fano interference. It is shown that incoherent pumping fields make the threshold of optical bistability behave differently by Fano interference. Moreover, in the presence of Fano interference the medium becomes phase-dependent. Therefore, the relative phase of applied fields can affect the behaviors of optical bistability and intensity threshold can be controlled easily. 相似文献
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近年来,半导体超晶格的光双稳器件由于功耗低、体积小、易于集成优点,引起国内外人们的广泛重视,特别是经优化的F-P腔光双稳器件,其反射式光双稳比透射式光双稳有很多的优点. 相似文献
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H. R. Hamedi S. H. Asadpour M. Sahrai B. Arzhang D. Taherkhani 《Optical and Quantum Electronics》2013,45(3):295-306
We investigate the optical bistability (OB) and optical multi-stability (OM) in a four-level Y-type atomic system. It is found that the optical bistability can strongly be affected by intensity and frequency detuning of coupling and probe fields. The effect of spontaneously generated coherence on phase control of the OB and OM is then discussed. It has also been shown that the optical bistability can be switched to optical multi-stability just by the quantum interference mechanism and relative phase of applied fields. 相似文献
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We studied the optical bistability of subwavelength metallic film coated by Kerr dielectric gratings numerically. It is found that the effect of optical bistability in the structure is explained by the excitations of the coupled surface plasmon polaritons at the coated metallic films. The effect of thickness of the metallic films on bistability loop is analyzed in detail, and the authors attribute the change of the bistability loop to the lifetime of the coupled surface plasmon polaritons. 相似文献
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Zhi-Hong Xiao 《Optics Communications》2010,283(10):2178-2181
The behavior of the optical bistability (OB) is investigated in an optical system which consists of a four-level atomic system with a microwave drive field and an optical cavity. It is found that the optical bistability can be accomplished by adjusting different physical parameters in both steady and transient process. Due to the existence of the microwave drive field, the optical bistability can be also obtained even under weak coherent coupling field condition. Since the intensity and phase of microwave drive field can be conveniently modulated, this optical system provides a new experimental method to test the optical bistability theory. 相似文献