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Blazed holographic grating, the production manner, and replica grating
Blazed holographic grating, the production manner, and replica grating
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机译:闪耀全息光栅,生产方式和复制光栅
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摘要
A substrate is subjected to holographic exposure to a sinusoidal or half-sinusoidal resist pattern corresponding to grating groove thereon. Thereafter, the substrate and the resist pattern are subjected to a first etching step at which they are irradiated with an ion beam obliquely at an angle that is identical to the blaze angle in the presence of CFSUB4 /SUBas an etching gas, whereby they are cut until the height of the resist is about 1/3 of the initial value. Thereafter, the substrate is subjected to a second etching step at which the substrate is irradiated with an ion beam in the direction corresponding to the bisector of the vertex in the presence of a mixture of CFSUB4 /SUBand OSUB2 /SUBas an etching gas, whereby the substrate is cut until the resist disappears completely to an extent such that some overetching occurs.
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