Abstract
The Lorentz oscillator model is applied to a strongly coupled hybridized light-matter state. It is noted that the real part of the index undergoes rapid change in the area of the so-called “dark states.” This property of hybridized light-matter states could allow them to function as unorthodox materials in which their absorptive and refractive properties are selectively manipulated. In this manuscript, basic properties of hybrid light-matter states are reviewed. The Lorentz oscillator model is then applied to two types of light-matter states, one formed from a coupling of a single exciton and a single cavity photon, and one formed from coupling two excitons to a cavity photon.