Optical retardation plate and method of manufacturing the same

Details Optical retardation plate and method of manufacturing the same Optical retardation plate and method of manufacturing the same

2005-02-24

2008-09-23

Deo, Duy-Vu N (Department: 1792)

Optical: systems and elements

Diffraction

From grating

C359S596000

Reexamination Certificate

active

07428101

ABSTRACT:
A dielectric substrate having a refractive index n1is covered with an amorphous dielectric medium having a refractive index n2larger than the refractive index n1, and a rectangular grating is formed in the amorphous dielectric medium through an etching process. When microcrystal is formed in the amorphous dielectric medium through a thermal treatment to increase the refractive index n2, a magnitude Δn of structure double refraction increases accordingly. Hence, a phase refraction ΔΦ of an irregular grating pattern in the rectangular grating becomes large without increasing a depth D of each trench of the rectangular grating, and thus it is possible to obtain an optical retardation plate having a fine periodic structure and having a desired plate retardation.

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European Search Report dated Apr. 28, 2005.

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