Wavelength separation film and filter for optical communication using the same
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United States of America Patent
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Issued Date -
Aug 20, 2009
app pub date -
Dec 22, 2008
filing date -
Dec 25, 2007
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Abandoned
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Abstract
A wavelength separation film having a structure containing plural thin films laminated to each other including a first thin film containing a high refractive index material, a second thin film containing a low refractive index material, and a third thin film containing a material having an intermediate refractive index that intervenes between the refractive index of the high refractive index material and the refractive index of the low refractive index material, the high refractive index material being silicon, the low refractive index material being at least one selected from silicon oxide, magnesium fluoride and aluminum oxide, and the material having an intermediate refractive index being at least one selected from titanium oxide, tantalum oxide, niobium oxide, zirconium oxide, hafnium oxide and aluminum oxide.
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