Diffraction from metallic gratings with locally varying profile forms

Citation
Wr. Tompkin et al., Diffraction from metallic gratings with locally varying profile forms, OPTICS LETT, 24(2), 1999, pp. 71-73
Citations number
10
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Optics & Acoustics
Journal title
OPTICS LETTERS
ISSN journal
01469592 → ACNP
Volume
24
Issue
2
Year of publication
1999
Pages
71 - 73
Database
ISI
SICI code
0146-9592(19990115)24:2<71:DFMGWL>2.0.ZU;2-G
Abstract
Measurements of the diffraction characteristics of one-dimensional surface- relief gratings of locally varying profile are compared with rigorous diffr action theory. These gratings result from the superposition of two linear s inusoidal gratings of uniform depth for which the relative phase between th e two gratings varies slowly with position. The resultant surface profile e xhibits a relatively large-period variation in profile form. The periodic v ariation in diffraction efficiency that results yields a visual moire patte rn that has interesting asymmetry and polarization properties that alter as the viewing conditions are changed; the gratings Lean be exploited by diff ractive optically variable devices for document security. (C) 1999 Optical Society of America.