  The phenomenon of trapping broad spectrum of light is known as `rainbow
trapping' and achieved using all-dielectric, hybrid metallo-dielectric or
all-metallic configurations. In the latter cases, unavoidable ohmic losses
result in sub-picosecond trapped-mode lifetimes. For all practical purposes,
novel strategies are required to be devised for trapping and subsequently,
releasing broadband electromagnetic (em) field with lifetime > 1 ps. We present
a rainbow trapping configuration using the excitation of multiple optical Tamm
(OT) modes in an one-dimensional chirped photonic crystal (PC) designed for
adiabatically coupling counter-propagating modes. In the geometry, the multiple
pi phase jumps enable excitation of OT modes when a thin plasmon-active metal
is placed adjacent to the terminating layer of chirped-PC (CPC). The strongly
localized OT resonances are spatially separated in the chirped-PC geometry and
their group-velocities reduce to as low as 0.17c. The time-domain simulations
elucidate localization takes place in the dielectric sections of CPC which
manifest into lifetimes 3 ps.
