Nasehi R, Mahmoudi M
Appl Opt. 2018 Sep 20;57(27):7714-7721. doi: 10.1364/AO.57.007714.
The Goos and Hänchen (GH) shifts in reflected and transmitted probe light through a cavity mixture of left- and right-handed chiral molecules into two enantiomer states are investigated. Due to the broken mirror symmetry of the left- and right-handed chiral molecules in the presence of cyclic population transfer, such quantum systems can be selectively excited because of the coexistence of one- and two-photon transitions. With the help of coupling Rabi frequency and damping effects due to scattering processes, the generated GH shifts accompanied by simultaneously negative and positive lateral shifts in reflected and transmitted probe lights are greatly enhanced. It is found that the large negative and positive GH shifts are available in the presence of multiphoton resonance and off-resonance conditions for two different enantiomers' chiral molecules. Moreover, the switching between superluminal and subluminal light propagation is extremely dependent on choosing the left- and right-handed chiral molecules. Furthermore, the effects of pulse shape and mode of Laguerre-Gaussian probe light on the GH shifts that lead to a switch between negative and positive shift are also studied. The negative and positive GH shifts in a reflected and transmitted probe beam for an incident Gaussian and different mode of Laguerre-Gaussian shaped beam with various widths by the use of two different enantiomers' chiral molecules are also discussed.
研究了通过左旋和右旋手性分子的腔混合体进入两种对映体状态的反射和透射探测光中的古斯-汉欣（GH）位移。由于在循环粒子转移存在的情况下左旋和右旋手性分子的镜面对称性被打破，由于单光子和双光子跃迁的共存，这样的量子系统可以被选择性激发。借助耦合拉比频率和散射过程引起的阻尼效应，反射和透射探测光中同时出现的负向和正向横向位移所产生的GH位移被大大增强。发现在多光子共振和非共振条件下，对于两种不同对映体的手性分子可出现大的负向和正向GH位移。此外，超光速和亚光速光传播之间的切换极其依赖于左旋和右旋手性分子的选择。此外，还研究了拉盖尔-高斯探测光的脉冲形状和模式对导致正负位移切换的GH位移的影响。还讨论了使用两种不同对映体的手性分子时，对于入射高斯光束和不同模式的具有各种宽度的拉盖尔-高斯形状光束，反射和透射探测光束中的正负GH位移。
