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We generated an atmospheric pressure helium plasma inside a silica hollow optical fiber (HOF) and the surface wettability of the inside wall was flexibly controlled by the plasma intensity. By filling the glycerol into the HOF, we experimentally investigated the surface characteristics by contact angle measurements. Liquid-fiber optic lenses with various numerical apertures were proposed and the light...
We generated atmospheric pressure helium plasma inside a hollow optical fiber (HOF). Hydrophilicity of inside wall was investigated through contact angle measurements after filling glycerol into the HOF. Controllable lensed liquid-fiber optics was fabricated under various plasma conditions.
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