Showing papers by "Philip St. J. Russell published in 2003"
TL;DR: In this article, a periodic array of microscopic air holes that run along the entire fiber length are used to guide light by corralling it within a periodic arrays of microscopic holes.
Abstract: Photonic crystal fibers guide light by corralling it within a periodic array of microscopic air holes that run along the entire fiber length Largely through their ability to overcome the limitations of conventional fiber optics—for example, by permitting low-loss guidance of light in a hollow core—these fibers are proving to have a multitude of important technological and scientific applications spanning many disciplines The result has been a renaissance of interest in optical fibers and their uses
3,918 citations
TL;DR: Modulation instability at high frequencies has been demonstrated in the normal dispersion regime by use of a photonic crystal fiber that provides efficient conversion of red pump light into blue and near-infrared light.
Abstract: Modulation instability at high frequencies has been demonstrated in the normal dispersion regime by use of a photonic crystal fiber. This fiber-optic parametric generator provides efficient conversion of red pump light into blue and near-infrared light.
294 citations
TL;DR: The results suggest that sonic band gaps can be used to manipulate sound with great precision and enhance its interaction with light in a dual-core square-lattice photonic crystal fibre preform.
Abstract: We study the localisation and control of high frequency sound in a dual-core square-lattice photonic crystal fibre preform. The coupled states of two neighboring acoustic resonances are probed using an interferometric set up, and experimental evidence is obtained for odd and even symmetry trapped states. Full numerical solutions of the acoustic wave equation show the existence of a two-dimensional sonic band gap, and numerical modelling of the strain field at the defects gives results that agree well with the experimental observations. The results suggest that sonic band gaps can be used to manipulate sound with great precision and enhance its interaction with light.
85 citations
TL;DR: The generation of distinct visible spectral components in the visible at the output of the fiber in dependence of the input pulse's polarization state is observed.
Abstract: We report on the control of visible harmonic generation in microstructured fiber through the polarization state of the fundamental radiation. By coupling λ=1.55 µm femtosecond pulses that have the same peak power into a short length (Z=20 cm) of high-Δ microstructured fiber, we observe the generation of distinct visible spectral components in the visible at the output of the fiber in dependence of the input pulse’s polarization state.
46 citations
TL;DR: It is demonstrated that matter-wave solitary pulses formed from Bose condensed atoms moving inside optical lattices continuously radiate dispersive matter waves with prescribed momentum.
Abstract: We demonstrate that matter-wave solitary pulses formed from Bose condensed atoms moving inside optical lattices continuously radiate dispersive matter waves with prescribed momentum. Our analytical results for the radiation parameters and the soliton decay rate are found to be in excellent agreement with numerical modeling performed for experimentally relevant parameters.
22 citations
14 Apr 2003
TL;DR: In this paper, a heat-treatment process analogous to the tapering of conventional fibers, except that in PCFs there is a second degree of freedom to exploit, not only can the fiber be stretched to locally reduce its cross-sectional area, but the air holes can be changed in size by heating alone under the effect of surface tension.
Abstract: Photonic crystal fibers (PCFs) have been receiving increasing attention over the past few years. They are single material fibers that use an array of air holes in the cladding to confine light to a core, instead of the more usual refractive index step within the solid material of a conventional fiber. As PCFs become more well-understood mainstream structures, the need arises to develop techniques to process them post-fabrication to form all-fiber devices. We have chosen to study heat-treatment processes analogous to the tapering of conventional fibers, except that in PCFs there is a second degree of freedom to exploit. Not only can the fiber be stretched to locally reduce its cross-sectional area, the air holes can be changed in size by heating alone under the effect of surface tension.
17 citations
14 Aug 2003
TL;DR: In this article, the effective properties of the holey material can be engineered to differ widely from the bulk properties of a matrix material, which has led to development of fibres with unusual and useful properties for applications throughout physical and biological sciences.
Abstract: Photonic crystal fibre, or holey fibre, offers a new paradigm in optical fibre where the effective properties of the holey material can be engineered to differ widely from the bulk properties of the matrix material. This engineering freedom has led to development of fibres with unusual and useful properties for applications throughout physical and biological sciences.
1 citations
22 Jun 2003
TL;DR: In this article, a human cell and other human biopsies for two fiber broadened femtosecond light sources, achieving 0.5μm axial resolution in the visible and 1.4μm in the in the 1300nm wavelength region.
Abstract: Ultrahigh axial resolution OCT is demonstrated in human cells and other human biopsies for two fiber broadened femtosecond light sources, achieving 0.5μm axial resolution in the visible and 1.4μm in the in the 1300nm wavelength region.
1 citations
TL;DR: In this paper, a review of some of the results of these results is presented, as well as a discussion of the use of ultrafast pulses in optical fibers and in photonic crystal fibers has generated a renaissance of interest in nonlinear phenomena of guided light.
Abstract: The use of conveniently available ultrafast pulses in optical fibers and in photonic crystal fibers has generated a renaissance of interest in nonlinear phenomena of guided light spanning from propagation dynamics to supercontinuum generation. A review of some of these results will be presented.