Optical: systems and elements – Having significant infrared or ultraviolet property – Multilayer filter or multilayer reflector
Patent
1997-10-29
1999-04-06
Shafer, Ricky D.
Optical: systems and elements
Having significant infrared or ultraviolet property
Multilayer filter or multilayer reflector
359584, 359585, 359589, 359883, 359884, 385 31, 385 38, F21V 904, G02B 508, G02B 626
Patent
active
058926186
ABSTRACT:
Gold is useful for infrared polarization-insensitive mirrors on silica. However, gold does not adhere to bare silica. The adherence is enhanced by depositing an optically thin glue layer of Ni--P on a silica surface after sensitization of the surface and activation. The Ni--P layer has a thickness sufficient to enhance adherence of gold to the surface of silica, but insufficient to act as a barrier to the passage of infrared radiation to or from the gold layer. One measure of the Ni--P thickness is the absorbance of the glue layer of >0.008 at 550 nm (>0.003 at 850 nm) as measured by a spectrophotometer. A 100-150 nm thick gold layer, deposited on this adhesion layer, adheres well enough to pass the commonly used "Scotch tape adhesion test". The ability to make gold adhere to silica with very low optical loss is useful in fabrication of lightwave devices which require the use of reflecting surfaces, such as an optical fibers or waveguides.
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Lucent Technologies - Inc.
Shafer Ricky D.
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