We discuss the conditions under which photonic crystal dispersion can be used to enhance light-matter interactions, e.g. by increasing the absorption sensitivity or the degree of light-speed control obtained via electromagnetically induced transparency.
On the basis of a general analysis of waveguides containing a dispersive material, we identify conditions under which slow-light propagation may enhance the gain, absorption, or phase change. The enhancement is shown to depend on the slow-light mechanism and the translational symmetry of the waveguide. A combination of material and waveguide dispersion may strongly enhance the control of light speed, e.g., using electromagnetically induced transparency in quantum dots embedded in a photonic crystal waveguide.