Coherent generation of superluminal and subluminal propagation of structured light in five level atomic medium

Abstract

Here, we investigate the structured superluminal and subluminal light propagation in the medium generated through a five-level atomic configuration controlled by a tiny probe and multiple of the control field. The absorption and dispersion are altered with the topological charges of control fields. The maxima and minima of absorption and corresponding normal/anomalous dispersion region are enhanced according to the \(2\ell\) condition in the medium. The group index differs in the domain of \(-15000\le n_g \le 17500\) in the position ranges of \(-1\mu m\le x,y \le 1 \mu m\). The corresponding velocity of the envelope wave \(v_{g}\) is calculated by \(c/n_g\). The subluminal and superluminal maximum and minimum regions are also enhanced with the \(2\ell\) condition in the medium. The modified work of this manuscript is useful for storage devices, imaging coding, and designing technology.