Coherent Control of Vortex Plasmon Polariton Waves at the Interface of a Five-Level High-Magneto-Optical Medium and Silver-Silica Nanocomposite Material

Abstract

The propagation of surface plasmon polariton (SPP) waves is coherently manipulated at the interface between a five-level high-magneto-optical medium and a silver-silica nanocomposite material using driven optical vortex control fields. The optical response of the high-magneto-optical medium is analyzed using density matrix formalism, where the optical vortex fields are introduced through spatially dependent Rabi frequencies. The real part of the SSP dispersion relation \(Re(k_{sp})\) is controlled in the range \(1.765k_0\le Re(k_{sp}(x,y))\le 1.925k_0\), exhibiting helical distributions of maxima and minima in the spatial region \(-2\lambda \le x,y\le 2\lambda \). The damping spectrum of the SPP varies in the range of \(0.120k_0\le Im(k_{sp}(x,y))\le 0.275k_0\), also showing a vortex-dependent spatial distribution. The group index varies in the range of \(365\le n^{sp}_g(x,y)\le 537\), while the corresponding group velocity varies in the range of \(5.3\times 10^5m/s\le v^{sp}_g(x,y)\le 7.7\times 10^5m/s\). The number of maxima and minima increases with increasing orbital angular momentum (OAM) of the optical vortex control fields for \(\ell =1,2,3,4\). The modified results of our manuscript is useful for biosensing, photovoltaic devices and, advanced sensor technology.