Slow and fast light propagation in a defect slab doped with polaritonic materials and nanoparticles

In this paper, the group velocity of transmitted and reflected pulses through a defect dielectric medium doped with polaritonic materials and nanoparticles is explored by using the density matrix equations and transform matrix method. It is demonstrated that the group velocity of transmitted and reflected lights can be manipulated by adjusting the system's parameters. The effect of the dipole–dipole interaction is also discussed on behaviors of transmitted and reflected pulses through the slab. Our proposed model may be opened up the possibility of new storage and switching devices based on polaritonic material nanoparticles in future commercial systems. (paper)