Low-loss deposition of solgel-derived silica films on tapered fibers

Films of porous silica are deposited on the uniform waists of tapered fibers in minutes by a modified solgel dip coating method, inducing less than 0.2 dB of loss. The coated tapers are an ideal platform for realizing all-fiber devices that exploit evanescent-field interactions with the deposited po...

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Bibliographic Details
Published in:Optics letters 2004-04, Vol.29 (7), p.694-696
Main Authors: Kakarantzas, G, Leon-Saval, S G, Birks, T A, Russell, P St J
Format: Article
Language:English
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Summary:Films of porous silica are deposited on the uniform waists of tapered fibers in minutes by a modified solgel dip coating method, inducing less than 0.2 dB of loss. The coated tapers are an ideal platform for realizing all-fiber devices that exploit evanescent-field interactions with the deposited porous film. As an example we demonstrate structural long-period gratings in which a periodic index variation in the film arises from the porosity variation produced by spatially varying exposure of the waist to a scanned CO2 laser beam. The long period grating is insensitive to temperature up to 800 degrees C.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.29.000694