偶极子位置及偏振对激发光子晶体H1微腔的影响

发布时间：2018-05-31 21:45

本文选题：光子晶体微腔 + 时域有限差分方法　；参考：《物理学报》2016年13期

【摘要】：光子晶体微腔和量子点的集成是实现量子信息处理非常具有潜力的平台之一,利用微腔和量子点的耦合可以制备纠缠光子对,实现对量子态的操控.因为光子晶体微腔具有品质因子高、模场体积小等优点,可以极大地增强光与物质之间的相互作用,从而易于实现量子态在不同物理体系之间的转换.通过单量子点和光子晶体H1微腔的耦合可以产生纠缠光子对,因为H1微腔具有简并的、模式偏振正交的基态模式.通常微腔模式的激发随着量子点在微腔中的位置变化而改变,本文用时域有限差分方法研究了偶极子光源的位置及偏振对激发光子晶体H1微腔模式的影响.结果表明:通过改变偶极子光源位置可以选择性地激发H1微腔简并模式中的一个;具有某一偏振的偶极子光源只能激发相应偏振的微腔模式;模式激发强度的大小也是由偶极子光源在微腔中的位置决定的.鉴于目前量子点在微腔中的位置尚不能精确控制,所以微腔模式受激发光源位置的影响的研究具有重要意义.
[Abstract]:The integration of photonic crystal microcavities and quantum dots is one of the most promising platforms for quantum information processing. Entangled photon pairs can be prepared by using the coupling of microcavities and quantum dots to control quantum states. Because the photonic crystal microcavity has the advantages of high quality factor and small mode field volume, it can greatly enhance the interaction between light and matter, so it is easy to realize the conversion of quantum states between different physical systems. Entangled photon pairs can be generated by the coupling of single quantum dots and photonic crystal H1 microcavities, because H1 microcavities have degenerate, mode polarization orthogonal ground state modes. Generally, the excitation of the microcavity mode changes with the position of quantum dots in the microcavity. In this paper, the influence of the position and polarization of the dipole source on the excited photonic crystal H1 microcavity mode is studied by using the finite-difference time-domain method. The results show that one of the degenerate modes of H1 microcavity can be selectively excited by changing the position of the dipole light source, and that the dipole light source with a certain polarization can only excite the corresponding polarized microcavity mode. The mode excitation intensity is also determined by the position of the dipole light source in the microcavity. In view of the fact that the position of quantum dots in the microcavity can not be accurately controlled at present, it is of great significance to study the effect of the position of the excited light source on the mode of the microcavity.
【作者单位】：中国科学院物理研究所北京凝聚态物理国家实验室;
【基金】：国家重点基础研究发展计划(批准号:2013CB328706,2014CB921003) 国家自然科学基金(批准号:91436101,61275060) 中国科学院先导项目(批准号:XDB07030200);中国科学院百人计划资助的课题~~
【分类号】：O734

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