  Fresnel single aperture diffraction (FSAD) is proposed as a phase-sensitive
probe for pairing symmetry and Fermi surface of a superconductor. We consider
electrons injected, through a small aperture, into a thin superconducting (SC)
layer. It is shown that in case of SC gap symmetry
$\Delta(-k_x,\mathbf{k}_\parallel)=\Delta(k_x,\mathbf{k}_\parallel)$ with $k_x$
and $\mathbf{k}_\parallel$ respectively the normal and parallel component of
electron Fermi wavevector, quasiparticle FSAD pattern developed at the image
plane is zeroth-order minimum if $k_x x=n\pi$ ($n$ is an integer and $x$ is SC
layer thickness). In contrast, if
$\Delta(-k_x,\mathbf{k}_\parallel)=-\Delta(k_x, \mathbf{k}_\parallel)$, the
corresponding FSAD pattern is zeroth-order maximum. Observable consequences are
discussed for iron-based superconductors of complex multi-band pairings.
