Ghost imaging schemes: fast and broadband
Abstract
In ghost imaging schemes information about an object is extracted by measuring the correlation between a beam that passed the object and a reference beam. We present a spatial averaging technique that substantially improves the imaging bandwidth of such schemes, which implies that information about high-frequency Fourier components can be observed in the reconstructed diffraction pattern. In the many-photon regime the averaging can be done in parallel and we show that this leads to a much faster convergence of the correlations. We also consider the reconstruction of the object image, and discuss the differences between a pixel-like detector and a bucket detector in the object arm. Finally, it is shown how to non-locally make spatial filtering of a reconstructed image. The results are presented using entangled beams created by parametric down-conversion, but they are general and can be extended also to the important case of using classically correlated thermal-like beams.
Cite
@article{arxiv.quant-ph/0409215,
title = {Ghost imaging schemes: fast and broadband},
author = {M. Bache and E. Brambilla and A. Gatti and L. A. Lugiato},
journal= {arXiv preprint arXiv:quant-ph/0409215},
year = {2009}
}
Comments
15 pages, published in Optics Express. Figures in online version miss some information in axes labels, therefore we have updated the arXiv version to the published version and with the correct axes labels. The movies are available at the Optics Express home page