title: Vortex-phase filtering technique for extracting spatial information from unresolved sources.
abstract: A white light vortex coronagraph was used to experimentally achieve sub-resolution detection. The angular location of the centroid γ, and the angular extent of circular pinhole sources Θ, were measured to within errors of δγ=±0.015λ/D and δΘ=±0.026λ/D. This technique has two advantages over conventional imaging: simple power measurements are made and shorter exposure times may be required to achieve a sufficient signal-to-noise ratio.
authors.forename: Garreth J
authors.initials: GJ
authors.lastname: Ruane
authors.forename: Prachyathit
authors.initials: P
authors.lastname: Kanburapa
authors.forename: Jiaxuan
authors.initials: J
authors.lastname: Han
authors.forename: Grover A
authors.initials: GA
authors.lastname: Swartzlander