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Chinese Physics Letters

Absorption Spectra of a Three-Level Atom Embedded in a PBG Reservoir

张涵, 张珂, 张汉壮

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

我们介绍“进 anatom 的密度矩阵方程的条款在 photonic 乐队差距(PBG ) 嵌入的腐烂率”水库成功地。由利用 masterequations，探查吸收系列和在 thePBG 水库的一个三水平的原子的折射度性质被获得。在象原子的吸收上的干扰也被拿了进 account.It 的量的 theeffects 一样的原子和 PBG 水库之间的相互作用有趣在一分散的折射度 areexhibited 的异常分散关系的二种不同类型排队。这里使用的方法论能被用于在一座 PBG 水库嵌入的另外的原子模型的量干扰效果的 theoreticalinvestigation。

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我们介绍“进 anatom 的密度矩阵方程的条款在 photonic 乐队差距(PBG ) 嵌入的腐烂率”水库成功地。由利用 masterequations，探查吸收系列和在 thePBG 水库的一个三水平的原子的折射度性质被获得。在象原子的吸收上的干扰也被拿了进 account.It 的量的 theeffects 一样的原子和 PBG 水库之间的相互作用有趣在一分散的折射度 areexhibited 的异常分散关系的二种不同类型排队。这里使用的方法论能被用于在一座 PBG 水库嵌入的另外的原子模型的量干扰效果的 theoreticalinvestigation。
驾驶五水平的原子在 photonic 晶体嵌入的无线电频率(RF ) 的探查吸收分散系列被考虑各向同性的双乐队 photonic-band-gap (PBG ) 水库调查。在使用的模型，分别地，二转变被上面、更低的乐队在如此的 PBG 材料联合，因此导致一些好奇的现象。数字模拟为光系列被执行。当一转变频率在乐队差距内，其它在差距外面时，它被发现那，在那里出现在吸收系列的三座山峰。然而，为案例，二转变频率躺着在内或在乐队差距外面，系列显示四吸收侧面。特别，在那里出现在系列的二座锋利的山峰当两转变频率在乐队内存在时，豁开。吸收性、散的反应上的驾驶 RF 的地的紧张和频率的影响在不同乐队边位置下面被分析。一个透明性窗口出现在吸收系列，这被发现并且被调整系统参数被分散侧面的一个很陡峭的变化伴随。这些结果证明系统的吸收分散性质强烈取决于导致 RF 的量干扰和 PBG 水库的状态(DOS ) 的密度。
We introduce the `decay rate' terms into the density matrix equations of an atom embedded in a photonic band gap (PBG) reservoir successfully. By utilizing the master equations, the probe absorption spectra and the refractivity properties of a three-level atom in the PBG reservoir are obtained. The interaction between the atom and the PBG reservoir as well as the effects of the quantum interference on the absorption of the atom has also been taken into account. It is interesting that two different types of the anomalous dispersion relations of refractivity are exhibited in one dispersion line. The methodology used here can be applied to theoretical investigation of quantum interference effects of other atomic models embedded in a PBG reservoir.
The probe absorption-dispersion spectra of a radio-frequency (RF)-driven five-level atom embedded in a photonic crystal are investigated by considering the isotropic double-band photonic-band-gap (PBG) reservoir. In the model used, the two transitions are, respectively, coupled by the upper and lower bands in such a PBG material, thus leading to some curious phenomena. Numerical simulations are performed for the optical spectra. It is found that when one transition frequency is inside the band gap and the other is outside the gap, there emerge three peaks in the absorption spectra. However, for the case that two transition frequencies lie inside or outside the band gap, the spectra display four absorption profiles. Especially, there appear two sharp peaks in the spectra when both transition frequencies exist inside the band gap. The influences of the intensity and frequency of the RF-driven field on the absorptive and dispersive response are analyzed under different band-edge positions. It is found that a transparency window appears in the absorption spectra and is accompanied by a very steep variation of the dispersion profile by adjusting system parameters. These results show that the absorption-dispersion properties of the system depend strongly on the RF-induced quantum interference and the density of states (DOS) of the PBG reservoir.