M. Scalora et al., ULTRASHORT-PULSE PROPAGATION AT THE PHOTONIC BAND-EDGE - LARGE TUNABLE GROUP DELAY WITH MINIMAL DISTORTION AND LOSS, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 54(2), 1996, pp. 1078-1081
We examine optical pulse propagation through a 30-period, GaAs/AlAs, o
ne-dimensional, periodic structure at the photonic band-edge transmiss
ion resonance. We predict theoretically-and demonstrate experimentally
-an approximate energy, momentum, and form invariance of the transmitt
ed pulse, as well as large group index (up to 13.5). The group index i
s tunable and many orders of magnitude more sensitive to variation in
material refractive index than for bulk material. We interpret this ob
servation in terms of time-dependent electromagnetic states of the pul
se-crystal system.