A Fundamental Study on Imaging with an Off-Axis Fresnel Zone Plate

Abstract

An of-axis Fresnel zone plate, through use of a halftone screen to introduce a spatial carrier frequency, can be used as a large-area, coded aperture for imaging incoherent radiation sources. This paper discusses the structure of off-axis Fresnel zone plate as an aperture and the method of imaging from the viewpoint of the spatial resolution by optical simulation, appending some examples of objects, holograms and reconstructed images. It is then concluded that the of axis Fresnel zone plate having D (diameter) =5.8 cm and ν_e (spatial center frequency) =23 l/cm is sufficient for the reconstructed images.