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Fisher information for far-field linear optical superresolution via homodyne or heterodyne detection in a higher-order local oscillator mode
Physical Review A
The distance between two point light sources is difficult to estimate if that distance is below the diffraction (Rayleigh's) resolution limit of the imaging device. A recently proposed technique enhances the precision of this estimation by exploiting the source-separation-dependent coupling of light into higher-order TEM modes, particularly the TEM_01 mode of the image. We theoretically analyze the estimation of the source separation by means of homodyne or heterodyne detection with a localdoi:10.1103/physreva.96.063829 fatcat:x6hz6jl3enb2fkze5cnib5i4rq