Guidance mechanisms in hollow-core photonic crystal fiber
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We review recent progress on the understanding of optical guidance mechanisms in hollow-core photonic crystal fibers. Two classes of hollow-core photonic crystal fiber are identified, one guides via a photonic bandgap and the other guides by virtue of an inhibited coupling between core and cladding mode constituents. For the former fiber type, we explore how the bandgap is formed using a photonic analogue of the tight-binding model and how it is related to the antiresonant reflection optical wave-guidance. For the second type of fiber, which can guide over a broad wavelength range, we examine the nature of the inhibited coupling.
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