Topic
Fresnel zone
About: Fresnel zone is a research topic. Over the lifetime, 2337 publications have been published within this topic receiving 37650 citations.
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TL;DR: In this article, the radial distribution of irradiance in a Fresnel diffraction pattern behind a circular aperture illuminated by a plane wave was measured using the Fresnel-Kirchhoff theory.
Abstract: The Fresnel–Kirchhoff theory is used to derive formulas which permit rapid calculation by personal computer of the radial distribution of irradiance in a Fresnel diffraction pattern behind a circular aperture illuminated by a plane wave. An experiment to measure the radial distribution of irradiance is described. The experimental results are in good, but not complete, agreement with the theory.
16 citations
TL;DR: In this article, the authors presented a set of nomographs for ready estimation of zone-plate parameters, and extended the study to incorporate imaging of any specific order, with a simple redefinition of the variables, the nomographs presented in the earlier paper retaining their practical usefulness.
Abstract: A Fresnel zone plate (FZP) produces simultaneously multiple images, both real and virtual. In general, none of the images is stigmatic beyond the paraxial domain. Axially stigmatic imaging by FZP’s calls for unique values of zone radii corresponding to each combination of the order number of the image and the object distance. In a recent paper [ J. Opt. Soc. Am. A10, 69 ( 1993)] we presented a set of nomographs for ready estimation of zone-plate parameters. The treatment dealt with the special case of a positive first-order image produced by a FZP. We now extend the study to incorporate imaging of any specific order. It is shown that, with a simple redefinition of the variables, the nomographs presented in the earlier paper retain their practical usefulness.
16 citations
TL;DR: Two examples are presented to illustrate the advantages of polarization coded apertures, in which the incoming light will rotate its polarization at a portion of an aperture.
Abstract: Two examples are presented to illustrate the advantages of polarization coded apertures, in which the incoming light will rotate its polarization at a portion of an aperture. In the first example the depth of field of a diffraction limited lens is increased without sacrificing the light throughput; in the second example the axial focal intensity of a pixelated Fresnel zone plate is increased by 100%. Both examples work for linearly polarized or unpolarized illumination.
16 citations
Patent•
27 Oct 1993TL;DR: In this paper, a pupil conjugation connecting elements (device) is constituted of eccentric Fresnel lenses 31, 32 divided into two sheets, correction lenses 33, 34 inserted between the lenses 31 and 32.
Abstract: PURPOSE:To obtain a projection optical system in which a Fresnel fringes of Fresnel-elements having a prism operation and a positive power are not projected by arranging optical elements having a periodic construction by shifting toward an optical axis from an intermediate-image position. CONSTITUTION:A pupil conjugation connecting elements (device) 30 is constituted of eccentric Fresnel lenses 31, 32 divided into two sheets, correction lenses 33, 34 inserted between the Fresnel lenses 31 and 32. The center F1 of the eccentric Fresnel lenses 31 and 32 is made eccentric to the center F2 of correction lenses 33 and 34. When the eccentric Fresnel lenses 31 and 34 are arranged by shifting from an inter-mediate image 13 in this way, Fresnel fringes of eccentric Fresnel lenses 31 and 32 are made to be a defocus state to a projection lens 21 of a second projection lens system 20. Thus, the image of the fringes is never formed inside a projected image.
16 citations
TL;DR: In this article, the authors examined the effect of scatterers being in the Fresnel zone of one another on the backscattering coefficient of both disc-shaped and needle-shaped leaves.
16 citations