Light Bullet Modes in Self-Induced-Transparency Media with Refractive Index Modulation

We predict the existence of a new type of spatiotemporal solitons ("light bullets") in two-dimensional self-induced-transparency media with refractive index modulation in the direction transverse to that of pulse propagation. These self-localized guided modes are found in an approximate analytical form, their existence and stability being confirmed by numerical simulations, and may have advantageous properties for signal transmission.