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基于单边傅里叶变换,本文提出一种研究辐射子的自发衰减动力学演化的普适方法.利用该方法研究了辐射子处于均匀介质、理想微腔和泄露微腔中的自发辐射动力学演化问题,最后并把这种方法用于处理光子带隙材料中的辐射动力学演化问题.结果表明:辐射子的自发辐射动力学特性由局域态密度决定,可以通过调控辐射子周围的局域态密度来调控辐射子的自发辐射特性,为实现新型的光电子器件提供了理论基础.该方法不仅适用于马尔科夫热库的情况也适用于非马尔科夫热库的情况. 相似文献
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The Influence of Cap and Defect Layer on Interface Optical-Phonon Modes in Finite Superlattices 下载免费PDF全文
Employing the transfer matrix method, we investigate the property of the interface optical-phonon modes (IOPMs) in a finite superlattice with a cap layer and a structural defect layer in the dielectric continuum approximation. In the present structure, there exist two types of defect IOPMs: localized modes and surface modes. The evolution of extended, localized and surface IOPMs can be clearly tracked with the thickness of the defect or cap layer. In some cases, degeneracy between surface IOPMs may occur, but the conservation of the total number of the IOPMs is always kept for every value of the transversal wave number. These results show that the spectra of these localized or surface IOPMs can be engineered by adjusting structural parameters. 相似文献
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对光声成像系统中声透镜的二元声学研究 总被引:3,自引:0,他引:3
基于二元声学的方法提出了一种折射/衍射混合声透镜设计方案,该声透镜在对光声信号进行二维成像时体现出了极大的优越性,与单声透镜相比,除了有实时成像、成像焦深较大且可以利用时间分辨技术实现层析成像的优点外,还可以利用二元声学透镜独特的色散特性校正单声透镜的轴向色差,可以极大提高成像的分辨力。通过计算机模拟了有一定带宽的点声源通过该声透镜像面上的点扩展函数,与经单声透镜的结果比较,可以看出点扩展函数弥散斑得到明显改善,极大地消除色差对成像质量的影响。 相似文献
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The reduced dynamics of a V-type three-level atom in a structure reservoir is presented,which has the exact solution in certain special condition.The Markovian and non-Markovian master equations for this composite system are solved and compared with the exact solution.The solving approach can be directly generalized to the solution of a V-type multilevel system dynamics interacting with a reservoir.The results further testify that these two kinds of master equations are exploited in different coupling regime,providing guidance for further application of these variants master equations to solve multilevel system dynamics without the exact solution. 相似文献
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