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Polarization-based digital holography of Fresnel-zone-plate convolution without motion

The polarization-based digital holography of Fresnel-zone-plate (FZP) convolution without motion is proposed. This method focuses mainly on imaging of two-dimensional objects embedded in highly scattering media. The key of the method is that the uniformly distributed light source is utilized to make many FZP projections superpose on an object in a classical incoherent correlator. In this way a hologram of the object is obtained by convoluting its intensity distribution with the FZP intensity distribution without relative motion. A method called composite hologram is applied to improve the low signal-to-noise ratio due to extremely weak signals submerging in large backgrounds. Especially, the configuration of this method is designed to avoid time-consuming. The polarization gating is used in order to extract the weakly polarized light from the highly scattered light. In experiments, the degree of polarization of circularly polarized light is maintained better than that of linearly polarized light in highly scattering media. Circularly polarized light is, accordingly, used in practice. The experiments on a 0.4-mm-diameter metal wire embedded in Intralipid-1% phantom are carried out. The outline of the metal wire can be still distinguished, although the reconstruced image becomes blurred as the thickness of cuvett increases to 30 mm. An attempt to apply this method to image the metal wire embedded in chicken tissue sections also be implemented. The reconstructed images can be distinguished in depth of 10 mm. The experimental results demonstrate that the method has potential applications in imaging of objects embedded in highly scattering media.