  We demonstrate theoretically the existence of one-way Tamm plasmon-polaritons
on the interface between magnetophotonic crystals and conducting metal oxides.
In contrast to conventional surface plasmon-polaritons (SPPs), Tamm
plasmon-polariton (TPPs) occur at frequencies above the bulk plasma frequency
of the conducting materials, provided that the dispersion curves of such
surface modes lie outside the light cone for the conducting oxides and
simultaneously fall into the photonic band gap of the magnetophotonic crystal.
The nonreciprocal properties of TPPs are caused by violation of the periodicity
and time reversal symmetry in the structure. Calculations on the field
distribution and transmission spectra through the structure are employed to
confirm the theoretical results, which could potentially impact on a broad
range of SPP-related phenomena in applications.
