Optical retardation plate and method of manufacturing the same

摘要: A dielectric substrate having a refractive index n 1 is covered with an amorphous medium 2 larger than the , and rectangular grating formed in through etching process. When microcrystal thermal treatment to increase magnitude Δn of structure double refraction increases accordingly. Hence, phase ΔΦ irregular pattern becomes large without increasing depth D each trench grating, thus it possible obtain optical retardation plate fine periodic desired retardation.