The control of spontaneous emission from a three-level atom in an anisotropic photonic crystal with two asymmetric bands
The control of spontaneous emission from a three-level atom in an anisotropic photonic crystal with two asymmetric bands
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DOI：
10.1080/09500340.2012.754061
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发表时间：
2013-01
影响因子：
1.3
通讯作者：
Xianshan Huang;Hailiang Liu;Chengyuan Ding
中科院分区：
文献类型：
--
作者：
Xianshan Huang;Hailiang Liu;Chengyuan Ding
从理论上研究了具有两个非对称带的各向异性光子晶体中受激发的三能级原子的自发辐射。用与位置有关的相位差描述了晶体晶胞中原子位置对自发辐射的影响。自由空间中的原子跃迁可以通过与光子晶体相关联的另一个跃迁耦合来操纵。结果表明，原子的位置相关位相有效地移动和调谐了自发辐射谱，导致了两个能带之间的光子态密度的不对称分布，增加的能带能将发射的光推向另一个能带。通过对光子晶体中发射场的分析，可以进一步阐明光子晶体的物理过程。这一结果或许为可调谐光子器件提供了一条有趣的途径。
We theoretically investigate the spontaneous emission light of an excited three-level atom embedded in an anisotropic photonic crystal with two asymmetric bands. The property of spontaneous emission relating to the atomic position in a unit cell of the crystal is described with a position-dependent phase difference. The atomic transition in free space can be manipulated by the other associated transition coupling to photonic crystal. The result shows that the spontaneous emission spectra are effectively shifted and tuned by the atomic position-dependent phase, which results in the asymmetric distribution of the photonic density of states between two bands, and the increasing band can push the emitted light towards the other band. The physical process can be further illuminated through analyzing the emitted field in photonic crystal. The result perhaps offers an interesting route towards tunable photonic devices.