Transmission type diffraction grating

Details Transmission type diffraction grating Transmission type diffraction grating

2005-07-22

2008-09-02

Assaf, Fayez G (Department: 2872)

Optical: systems and elements

Diffraction

From grating

C359S576000, C359S589000

Reexamination Certificate

active

07420735

ABSTRACT:
A transmission diffraction optical element is presented in which ridges having a roughly rectangular cross-section shape are disposed parallel to each other at a regular pitch at the surface of a substrate. Striped thin-film layers are formed on these ridges and a thin-film layer is inserted between the substrate and the ridges. The thin-film layers are arranged at a regular pitch identical to the regular pitch of the ridges and the thin-film layer does not have a periodic pattern oriented in the same direction as the periodic pattern of the ridges.

REFERENCES:
patent: 6754006 (2004-06-01), Barton et al.
patent: 7019904 (2006-03-01), Shiozaki et al.
patent: 7085054 (2006-08-01), Shiozaki et al.
patent: 2004/0136073 (2004-07-01), Shiozaki et al.
patent: 2006/0152809 (2006-07-01), Smith

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