D.P. Fussell

Three-dimensional local density of states in a finite two-dimensional photonic crystal composed of cylinders

The three-dimensional local density of states (3D-LDOS), which determines the emission properties of a point-like source, is presented for a finite two-dimensional photonic crystal (2D-PC), using the practical example of macroporous silicon.

Manipulation of spontaneous emission in a tapered photonic crystal fibre

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.

Defect modes in otherwise perfect photonic crystals and photonic crystal fibers

Many of the applications of photonic crystals and photonic crystal fibers require the periodic structure to have some type of defect. In photonic crystal fibers a point defect defines the fiber core, whereas in photonic crystals a line defect acts as a waveguide, and point defects act as cavities. The modeling of these defects usually either makes use of periodic boundary conditions, by which the defect is replicated periodically, or models a photonic crystal of finite extent. However, some applications, for example the cut-off behavior of a defect mode where the field extends very widely, require methods that can model a defect in an otherwise infinite and perfectly periodic structure. Here we present such a method. It combines the method of fictitious sources with averaging over the Brillouin zone, and we apply it to study the long-wavelength behavior of the fundamental mode of photonic crystal fibers.

Enhancement of emission due to local density of states (LDOS) effects in 2-D photonic crystal tapered optical fibre

Enhancement and suppression of spontaneous emission in certain directions near the bandgap is observed for dye molecules in the centre of tapered photonic crystal fibres, as predicted by LDOS calculations, but not by the bandstructure.

Reduction of spontaneous emission in tapered photonic crystal fibres

The spontaneous emission from dye introduced into the centre of tapered hollow-core photonic crystal fibre was characterized in the transverse direction. Suppression of emission due to local density of state effects, which cannot be understood from the bandstructure alone, were observed to be consistent with theory.

Inhibition of Spontaneous Emission via Quantum Path Interference in Coupled-Cavity Microstructures

We examine the rate of spontaneous emission in optical microstructures with coupled- cavity resonances. We show that for overlapping resonant modes, the rate can be strongly affected by quantum path interference into the two modes.