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Abstract
We characterize the spontaneous emission of dye that is introduced into the central core of a tapered photonic crystal fiber. Since the photonic crystal period in the fibre cladding varies along the taper, the transmission and spontaneous emission spectra over a wide range of relative frequencies can be observed. The spontaneous emission spectra of the fibre transverse to the fiber axis show suppression due to partial band-gaps of the structure, and also enhancement of spontaneous emission near the band edges. We associate these with van Hove features, as well as finite cluster size effects.
Highlights
Photonic crystals (PCs) have many potentially important applications, such as the manipulation of the spontaneous emission of atoms [1]
We characterize the spontaneous emission of dye that is introduced into the central core of a tapered photonic crystal fiber
The spontaneous emission spectra of the fibre transverse to the fiber axis show suppression due to partial band-gaps of the structure, and enhancement of spontaneous emission near the band edges. We associate these with van Hove features, as well as finite cluster size effects
Summary
Photonic crystals (PCs) have many potentially important applications, such as the manipulation of the spontaneous emission of atoms [1]. This application has received relatively little interest, in part because of the difficulty of the associated experiments and theory. Here we investigate spontaneous emission in a two-dimensional PC with modest refractive index variations, using a photonic crystal fibre (PCF). Our investigation is most closely related to the work of Cregan et al [5], in which the spontaneous emission pattern from Er3+ doped PCF was measured in a cone around the fiber axis. The dye emission is monitored in the plane transverse to the fibre axis
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