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Proceedings Paper

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

The grating optical low-pass filter (GOLF) has lots of advantages over traditional birefringent low-pass filter. But, one disadvantage of it is that the shadow image of the grating is visible, especially when the numerical aperture of a camera is large. We found that we can reduce the visibility of a grating image, if we adopted a multi-phase grating instead of a two-phase grating. First, from the simulation of the Fresnel diffraction pattern of a 1D multi- phase grating, we found the optimum width and phase of each grating step that minimizes the modulation of the Fresnel diffraction. And then, we designed a 2D multi-phase GOLF by extrapolating 1D structure. Four types of GOLF, four-phase, seven-phase, eight-phase, and also two-phase GOLF were manufactured with a semiconductor process. Finished GOLF samples were installed to a digital camera to take pictures of a test target and compare them with each other. Experiment results show that as the number of phase step increase, the gratin image becomes more indistinctive.

Paper Details

Date Published: 29 October 2001
PDF: 6 pages
Proc. SPIE 4594, Design, Fabrication, and Characterization of Photonic Devices II, (29 October 2001); doi: 10.1117/12.446575
Show Author Affiliations
Chun-Soo Go, Wonkwang Univ. (South Korea)
Jai-Cheol Lee, Wonkwang Univ. (South Korea)
Yong-Ho Oh, Wonkwang Univ. (South Korea)
Sungwoo Lim, Wonkwang Univ. (South Korea)
Shi-Ho Kim, Wonkwang Univ. (South Korea)

Published in SPIE Proceedings Vol. 4594:
Design, Fabrication, and Characterization of Photonic Devices II
Marek Osinski; Soo-Jin Chua; Akira Ishibashi, Editor(s)

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