巨梯型四能级里德伯原子系统透射光谱性质的调控  

Manipulation of transmission properties of a ladder-four-level Rydberg atomic system

作　　者：高小苹 梁景睿 刘堂昆 李宏 刘继兵 Gao Xiao-Ping;Liang Jing-Rui;Liu Tang-Kun;Li Hong;Liu Ji-Bing(College of Physics and Electronic Science,Hubei Normal University,Huangshi 435002,China;Hubei Key Laboratory of Optoelectronic Technology and Materials,Hubei Normal University,Huangshi 435002,China)

机构地区：[1]湖北师范大学物理与电子科学学院,黄石435002 [2]湖北师范大学,光电技术与材料湖北省重点实验室,黄石435002

出　　处：《物理学报》2021年第11期43-49,共7页Acta Physica Sinica

基　　金：湖北省高等学校优秀中青年科技创新团队项目(批准号:T2020014);国家自然科学基金(批准号:11874251)资助的课题。

摘　　要：采用超级原子模型研究了一个巨梯型四能级里德伯原子系统与一个弱光场和两个强控制场的相互作用.利用蒙特卡罗算法,通过数值求解海森伯-朗之万方程,讨论了系统的动力学演化,研究了偶极-偶极相互作用对探测场透射谱和二阶强度关联函数的影响.在有限温度下,利用洛伦兹分布函数代替麦克斯韦分布函数,得到解析的探测场极化率,讨论了强场的失谐量对系统出射探测场透射谱对称性质的影响,最后研究了多普勒效应对探测场透射谱和二阶强度关联函数的影响.结果表明,在电磁诱导透明条件下,透明窗口处出射探测场的透射率随着入射探测场强度的增强而减弱,而当系统入射探测场强度不变时,通过改变强场的失谐量可以得到非对称的透射谱.此外,当弱探测场和强场的传播方向一致时,多普勒效应对系统透射谱和二阶强度关联函数的峰值有很小的影响.当探测场和强场的传播方向不一致时,多普勒效应对系统透射谱和二阶强度关联函数的影响可以忽略.In this paper,we study the interaction of a giant ladder type four-level Rydberg atomic system with a weak light field and two strong control fields separately.We use the Monte Carlo method to calculate the dynamic evolution of this system and investigate the influence of dipole-dipole interaction on the transmission spectrum and second-order intensity correlation function of the weak probe field.By changing the value of detuningδe andδr,we can obtain the asymmetric transmission spectrum of the four-level Rydberg atomic system.The influence of Doppler effect on transmission spectrum and second-order intensity correlation function are also studied.By using super atom model,the influences of different incident probe field intensities on the transmission spectrum and the second-order intensity correlation function of probe field are discussed in the Rydberg atomic system.The results show that the transmission spectrum of the four-level Rydberg atomic system is symmetric when the detuningδ_(e)=δ_(r)=0.We obtain the asymmetric transmission spectrum of the system when the value of detuning(δ_(e),δ_(r))changes from 0 to 43 MHz.In order to evaluate the influence of temperature on the transmission spectrum of the system,the Lorentz distribution function is introduced to calculate the polarizability analytically.And,the influence of temperature on the asymmetric transmission spectrum and the second-order intensity correlation function are discussed at finite temperature separately.The results show that the transmittance of the outgoing probe field at the transparent window decreases with the increase of the intensity of the incident probe light field under the condition of electromagnetically induced transparency.When the intensity of the incident probe field is constant,the asymmetric transmission spectrum can be obtained by changing the detuning of the strong field.In addition,when the propagation direction of the probe field is consistent with that of the strong field,the peak value of the transmission spectrum an

关 键 词：里德伯原子 多普勒效应 非对称 偶极-偶极相互作用 

分 类 号：O562[理学—原子与分子物理]