Abstract
Plenoptic imaging (PI) enables refocusing, depth-of-field (DOF) extension and 3D visualization, thanks to its ability to reconstruct the path of light rays from the lens to the image. However, in state-of-the-art plenoptic devices, these advantages come at the expenses of the image resolution, which is always well above the diffraction limit defined by the lens numerical aperture (NA). To overcome this limitation, we have proposed exploiting the spatio-temporal correlations of light, and to modify the ghost imaging scheme by endowing it with plenoptic properties. This approach, named Correlation Plenoptic Imaging (CPI), enables pushing both resolution and DOF to the fundamental limit imposed by wave-optics. In this paper, we review the methods to perform CPI both with chaotic light and with entangled photon pairs. Both simulations and a proof-of-principle experimental demonstration of CPI will be presented.
Highlights
Plenoptic imaging is a recently established optical imaging technique, characterized by the possibility to simultaneously detect both the spatial distribution and the propagation direction of light in a given scene [1,2,3]
The results suggest that Correlation Plenoptic Imaging (CPI) can improve the power of plenoptic imaging, opening the way to promising applications, especially in fields like microscopy and 3D imaging where fast acquisition must be combined with high resolution
We have reviewed the basic principles and most relevant implementations of correlation plenoptic imaging, while focusing both on the improvement with respect to standard plenoptic imaging and the comparison among different CPI strategies
Summary
Plenoptic imaging is a recently established optical imaging technique, characterized by the possibility to simultaneously detect both the spatial distribution and the propagation direction of light in a given scene [1,2,3]. Attempts to weaken the resolution vs DOF trade-off have been made by using signal processing and deconvolution [4,6,35,36,37], and other algorithms and analysis tools have been developed [8,38] In this perspective, we have recently proposed a fundamentally different approach to PI, named correlation plenoptic imaging (CPI), which exploits the spatio-temporal correlation properties of light beams to physically decouple the image formation from the retrieval of the directional information [39]. Entangled photons from SPDC provide the possibility to perform CPI by correlating photons of different wavelengths in the two arms of the setup: light illuminating the object in one arm is not required to have the same wavelength as light remotely detected in the other arm [43,44,45].
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