Research on Photonic Bandgap-photonic Crystal Fibers

Photonic bandgap-photonic crystal fiber (PBG-PCF) is one of the photonic crystal fibers. The localized light in hollow-core of air-silica photonic crystal fibers is demonstrated experimentally. The existent conditions of the photonic bandgap (PBG) is caculated on the basis of the Maxwell equations. At certain bandgaps, light can be confined and propagate through the hollow-core of the fiber. Each bandgap is corresponding to a whole 2D photonic bandgap in the cladding of the photonic crystal fibers. The experiment shows that when the air-filling fraction is increased, the relative bandgap size is increased. It should be noted that the PBGs are strongly suppressed when the air hole sizes are decreased.