title: Obtaining spatial information from an extremely unresolved source.
abstract: A means to extract spatial information from an extremely unresolved source of light using a single element detector is demonstrated by use of an optical vortex coronagraph. Applications may range from astronomy to microscopy. For example, the centroid and angular extent of an unresolved collection of incoherent point sources is revealed.
authors.affiliation: Chester F. Carlson Center for Imaging Science and the Department of Physics, Rochester Institute of Technology, Rochester, New York 14623, USA. gaspci@rit.edu
authors.forename: Grover A
authors.initials: GA
authors.lastname: Swartzlander
mesh_terms: D000465:Algorithms; D004867:Equipment Design; D005583:Fourier Analysis; D007091:Image Processing, Computer-Assisted; D007909:Lenses; D008853:Microscopy / Q000379:methods*; D015233:Models, Statistical; D036103:Nanotechnology / Q000379:methods; D055095:Optics and Photonics; D015203:Reproducibility of Results