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Experimental study demonstrates single-mode light confinement within a hollow air core using photonic band gaps, suggesting opportunities for high-power transmission and atom guiding.
The confinement of light within a hollow core (a large air hole) in a silica-air photonic crystal fiber is demonstrated. Only certain wavelength bands are confined and guided down the fiber, each band corresponding to the presence of a full two-dimensional band gap in the photonic crystal cladding. Single-mode vacuum waveguides have a multitude of potential applications from ultrahigh-power transmission to the guiding of cold atoms.
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Cregan et al. (1999) studied this question.
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