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Retaining and characterising nano-structure within tapered air-silica structured optical fibers

S.T. Huntington, J. Katsifolis, B.C. Gibson, J. Canning, K. Lyytikainen, J. Zagari, L.W. Cahill, and J.D. Love

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Abstract

Air-silica fiber 125µm in diameter has been tapered down to ~15µm. At this diameter, it is commonly assumed that the nanostructured fiber holes have collapsed. Using an Atomic Force Microscope, we show this assumption to be in error, and demonstrate for the first time that structures several hundred nanometers in diameter are present, and that hole array structures are maintained. The use of Atomic Force Microscopy is shown to be an efficient way of characterising these structures.

©2003 Optical Society of America

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Figures (6)
Fig. 1.
Fig. 1. Schematic of optical fiber tapering rig.

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Fig. 2.
Fig. 2. AFM contact mode image of a 125µm air-silica structured fiber. Scan size = 60µm

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Fig. 3.
Fig. 3. AFM contact mode image of a nano-size spike clearly showing the self-imaging of the pyramidal tip. Scan size = 1.5µm

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Fig. 4.
Fig. 4. Hexagonal overlay showing fiber hole arrangement and distances used for inter-hole spacing measurements.

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Fig. 5.
Fig. 5. AFM contact mode image of a cleaved tapered air-silica structured fiber. Scan size = 5µm

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Fig. 6.
Fig. 6. Hexagonal overlay showing fiber taper hole arrangement and distances used for inter-hole spacing measurements.

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