  We investigate the light transmission through a nanoaperture in a metal film
deposited on a planar metamaterial. An effect of an anomalously high light
transmission through the nanoaperture is revealed, which we associate with the
enhancement of the field at the interface of the planar structure
"metamaterial-metal" due to the appearance of an optical Tamm state. In this
structure, we also observe an "optical diode" effect: the light transmission
radically changes as the direction of irradiation of the structure is reversed.
Our numerical results agree well with experimental data.
