STUDY ON THE OVERLAP OF LINEAR GRATINGS AND ZONE PLATES

Hu Di, Zheng Cheng, Cao Xiangqun, Yuan Bo

Abstract

This paper focuses on the principles and phenomena of the overlap pattern of the linear grating and zone plate. Deriving from the describing equations, it has been proved theoretically that the pattern also consists of zone plates, which are called moiré zone plates. The locations of the centers and the radius of the moiré zone plates are determined by the pitch of the linear grating, the first radius of the original zone plate and the phase of both of them. The fringe visibility is affected by the fill factor of linear grating and 0.5 results in the best visibility. Magnification, which is defined as the ratio of the change in area to the displacement in the x-axis direction, can be as large as 500. Furthermore, both AutoCAD and Matlab software were employed to verify the hypothesis.

Keywords

linear grating, zone plate, overlap, moiré zone plate

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DOI

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IMEKO TC

TC2 - Photonics

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