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Optical Engineering

Filtering characteristics and grating images of multiphase grating optical low-pass filters
Author(s): Yong-Ho Oh; Jai-Cheol Lee; Sungwoo Lim; Shi-Ho Kim; Chun-Soo Go
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Paper Abstract

Although the grating optical low-pass filter (GOLF) has many advantages over the traditional birefringent low-pass filter, it is not adopted in commercial digital cameras because the shadow image of the grating is visible, especially when the F-number of a camera is large. We design and manufacture grating optical low-pass filters with multiple phases to compare their filtering characteristics and shadow images. From the simulation of the Fresnel diffraction pattern of a 1-D multiphase grating, we obtain the optimum width and phase of each grating step that minimizes the visibility of the Fresnel diffraction pattern. We design 2-D multiphase structures by extrapolating the 1-D structure. Four types of GOLF are manufactured with a semiconductor process and installed into a digital camera to compare grating images. We find that the visibility of grating images can be reduced by increasing number of phase steps.

Paper Details

Date Published: 1 April 2003
PDF: 6 pages
Opt. Eng. 42(4) doi: 10.1117/1.1554404
Published in: Optical Engineering Volume 42, Issue 4
Show Author Affiliations
Yong-Ho Oh, Wonkwang Univ. (South Korea)
Jai-Cheol Lee, Wonkwang Univ. (South Korea)
Sungwoo Lim, Wonkwang Univ. (South Korea)
Shi-Ho Kim, Wonkwang Univ. (South Korea)
Chun-Soo Go, Wonkwang Univ. (South Korea)

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