The spatial longitudinal coherence length (SLCL), which is determined by the size of and the distance from the source, is introduced to investigate the longitudinal resolution of lensless ghost imaging. Its influence is discussed quantitatively by simulation. The discrepancy of position sensitivity between
Scarcelli et al. [Appl. Phys. Lett. 88, 061106 (2006)
Basano and Ottonello [Appl. Phys. Lett. 88, 091109 (2006)
] is clarified.
© 2008 Optical Society of America
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