  In this Letter we theoretically study the possibility of total power
absorption of light in a planar grid modelled as an effective sheet with zero
optical thickness. The key prerequisite of this effect is the simultaneous
presence of both resonant electric and magnetic modes in the structure. We show
that the needed level of the magnetic mode is achievable using the effect of
substrate-induced bianisotropy which also allows the huge local field
enhancement at the same wavelength where the maximal absorption holds.
