2015/12/31 by Ranjith Nair, Mankei Tsang · 3 citations
Physics and Astronomy · #physics.optics #quant-ph
paper · pdf · doi:10.1364/oe.24.003684
published as Optics Express 24, 3684 (2016) · Improved presentation; Added references; Robustness study under centroid mismatch included; 18 pages, 9 figures
arxiv created 2016/01/24 · arxiv updated 2016/02/16
A novel interferometric method - SLIVER (Super Localization by Image inVERsion interferometry) - is proposed for estimating the separation of two incoherent point sources with a mean squared error that does not deteriorate as the sources are brought closer. The essential component of the interferometer is an image inversion device that inverts the field in the transverse plane about the optical axis, assumed to pass through the centroid of the sources. The performance of the device is analyzed using the Cramér-Rao bound applied to the statistics of spatially-unresolved photon counting using photon number-resolving and on-off detectors. The analysis is supported by Monte-Carlo simulations of the maximum likelihood estimator for the source separation, demonstrating the superlocalization effect for separations well below that set by the Rayleigh criterion. Simulations indicating the robustness of SLIVER to mismatch between the optical axis and the centroid are also presented. The results are valid for any imaging system with a circularly symmetric point-spread function.