1 October 2011 Beyond the lateral resolution limit by phase imaging
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We present a theory to extend the classical Abbe resolution limit by introducing a spatially varying phase into the illumination beam of a phase imaging system. It allows measuring lateral and axial distance differences between point sources to a higher accuracy than intensity imaging alone. Various proposals for experimental realization are debated. Concretely, the phase of point scatterers' interference is experimentally visualized by high numerical aperture (NA = 0.93) digital holographic microscopy combined with angular scanning. Proof-of-principle measurements are presented by using sub-wavelength nanometric holes on an opaque metallic film. In this manner, Rayleighs classical two-point resolution condition can be rebuilt. With different illumination phases, enhanced bandpass information content is demonstrated, and its spatial resolution is theoretically shown to be potentially signal-to-noise ratio limited.
© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)
Yann J. Cotte, Yann J. Cotte, Muhammed Fatih Toy, Muhammed Fatih Toy, Christian D. Depeursinge, Christian D. Depeursinge, } "Beyond the lateral resolution limit by phase imaging," Journal of Biomedical Optics 16(10), 106007 (1 October 2011). https://doi.org/10.1117/1.3640812 . Submission:

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