Making optical low-pass spatial filters by thin-film phase grating

Sheng Hui Chen, Yong Tong Zou, Cheng Chung Lee

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


A modified rule was applied to design a grating optical low-pass spatial filter (GOLF) with a thin-film phase grating. This filter differed from the crystal type of optical low-pass spatial filter (OLPF). The fabrication method of the thin-film phase GOLF was also different from the conventional lithographic process. A new fabrication method utilizing a metal mesh mask and a thin-film coating process was applied to make the GOLF. The process had the advantages of being simple and cheap, and would thus be good for mass-production. The modulation transfer function (MTF) of the device was measured and the results agree well with the theoretical calculations. Finally, the GOLF was installed on a digital camera which was used to capture images of the circular zone plane (CZP), to show the Moiré pattern suppression ability.

Original languageEnglish
Pages (from-to)2215-2224
Number of pages10
JournalJournal of Modern Optics
Issue number15
StatePublished - 15 Oct 2006


Dive into the research topics of 'Making optical low-pass spatial filters by thin-film phase grating'. Together they form a unique fingerprint.

Cite this