Light-diffracting binary grating structure

Details Light-diffracting binary grating structure Light-diffracting binary grating structure

2005-06-14

2005-06-14

Juba, Jr., John (Department: 2872)

Optical: systems and elements

Diffraction

From grating

C359S572000, C359S575000, C428S916000

Reexamination Certificate

active

06906861

ABSTRACT:
A light-diffractive binary grating structure has a microscopic mesa structure (2) whose plateaux (5) are separated by valleys (4) of substantially rectangular cross-section, wherein the arrangement of the valleys (4) is periodically repeated. Within a period (T) of the mesa structure (2) at least N valleys (4) separate the plateaux (5), N being an integer and greater than 2. The mesa structure (2) is an additive superimposition of N phase-shifted rectangular structures which have the same period (T) of the mesa structure (2). Each of the rectangular structures has a phase shift such that the plateaux (5) of the one rectangular structure fall into the valleys (4) of the N−1 other rectangular structures. In addition the resulting mesa structure (2) has only a single valley between two plateaux (5), which is of a width greater than a seventh of the period (T). The binary grating structures are suitable for use in optically diffractive security elements as the binary grating structures cannot be copied with holographic means.

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