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A white light vortex coronagraph was used to experimentally achievesub-resolution detection. The angular location of the centroid, $\gamma$, andthe angular extent of circular pinhole sources, $\Theta$, were measured towithin errors of $\delta\gamma = \pm0.015\,\lambda/D$ and $\delta\Theta =\pm0.026\,\lambda/D$. This technique has two advantages over conventionalimaging: simple power measurements are made and shorter exposure times may berequired to achieve a sufficient signal-to-noise ratio.

Vortex-phase filtering technique for extracting spatial information from unresolved sources