Showing papers by "Philip St. J. Russell published in 2011"
TL;DR: In this article, the use of hollow-core photonic crystal fibers (PCFs) in the field of ultrafast gas-based nonlinear optics, including recent experiments, numerical modeling, and a discussion of future prospects, is discussed.
Abstract: We review the use of hollow-core photonic crystal fibers (PCFs) in the field of ultrafast gas-based nonlinear optics, including recent experiments, numerical modeling, and a discussion of future prospects. Concentrating on broadband guiding kagome-style hollow-core PCF, we describe its potential for moving conventional nonlinear fiber optics both into extreme regimes—such as few-cycle pulse compression and efficient deep ultraviolet wavelength generation—and into regimes hitherto inaccessible, such as single-mode guidance in a photoionized plasma and high-harmonic generation in fiber.
338 citations
TL;DR: It is shown theoretically that the photoionization process in a hollow-core photonic crystal fiber filled with a Raman-inactive noble gas leads to a constant acceleration of solitons in the time domain with a continuous shift to higher frequencies, opposite to the well-known Raman self-frequency redshift of sol itons in solid-core glass fibers.
Abstract: We show theoretically that the photoionization process in a hollow-core photonic crystal fiber filled with a Raman-inactive noble gas leads to a constant acceleration of solitons in the time domain with a continuous shift to higher frequencies, limited only by ionization loss. This phenomenon is opposite to the well-known Raman self-frequency redshift of solitons in solid-core glass fibers. We also predict the existence of unconventional long-range nonlocal soliton interactions leading to spectral and temporal soliton clustering. Furthermore, if the core is filled with a Raman-active molecular gas, spectral transformations between redshifted, blueshifted, and stabilized solitons can take place in the same fiber.
125 citations
TL;DR: The pressure-assisted fabrication approach opens up new ways of integrating sophisticated glass-based devices into optical fiber circuitry with potential applications in supercontinuum generation, magneto-optics, wavelength selective devices, and rare-earth-doped amplifiers with high gain per unit length.
Abstract: We report a hybrid chalcogenide–silica photonic crystal fiber made by pressure-assisted melt-filling of molten glass. Photonic bandgap guidance is obtained at a silica core placed centrally in a hexagonal array of continuous centimeters-long chalcogenide strands with diameters of 1.45 μm. In the passbands of the cladding, when the transmission through the silica core is very weak, the chalcogenide strands light up with distinct modal patterns corresponding to Mie resonances. In the spectral regions between these passbands, strong bandgap guidance is observed, where the silica core transmission loss is 60 dB/cm lower. The pressure-assisted fabrication approach opens up new ways of integrating sophisticated glass-based devices into optical fiber circuitry with potential applications in supercontinuum generation, magneto-optics, wavelength selective devices, and rare-earth-doped amplifiers with high gain per unit length.
95 citations
TL;DR: Pressure-assisted melt-filling of microcapillaries or photonic crystal fibers with magneto-optical glasses offers an alternative route to creating complex waveguide architectures from unusual combinations of glasses, including strongly diamagnetic tellurite or chalcogenide glasses with high refractive index.
Abstract: Magneto-optical glasses are of considerable current interest, primarily for applications in fiber circuitry, optical isolation, all-optical diodes, optical switching and modulation. While the benchmark materials are still crystalline, glasses offer a variety of unique advantages, such as very high rare-earth and heavy-metal solubility and, in principle, the possibility of being produced in fiber form. In comparison to conventional fiber-drawing processes, pressure-assisted melt-filling of microcapillaries or photonic crystal fibers with magneto-optical glasses offers an alternative route to creating complex waveguide architectures from unusual combinations of glasses. For instance, strongly diamagnetic tellurite or chalcogenide glasses with high refractive index can be combined with silica in an all-solid, microstructured waveguide. This promises the implementation of as-yet-unsuitable but strongly active glass candidates as fiber waveguides, for example in photonic crystal fibers.
73 citations
TL;DR: In this article, an air-silica photonic crystal fiber with a gold nanowire at core centre was shown to support a low-loss azimuthally polarized mode, acting as a single-polarization fibre with an extinction ratio >20 dB.
Abstract: An air–silica photonic crystal fibre with a gold nanowire at core centre is shown to support a low-loss azimuthally polarized mode. Since all the other modes have very high attenuation, the fibre effectively supports only this mode, acting as a single-polarization fibre with an extinction ratio >20 dB cm−1 over a broad range of wavelengths (550–1650 nm in the device reported). It can be used as an effective azimuthal mode filter.
33 citations
TL;DR: The use of a specially designed tapered photonic crystal fiber to produce a broadband optical spectrum covering the visible spectral range and a promising candidate for precision calibration of astronomical spectrographs is reported.
Abstract: We report the use of a specially designed tapered photonic crystal fiber to produce a broadband optical spectrum covering the visible spectral range The pump source is a frequency doubled Yb fiber laser operating at a repetition rate of 14 GHz and emitting sub-5 pJ pulses We experimentally determine the optimum core diameter and achieve a 235 nm broad spectrum Numerical simulations are used to identify the underlying mechanisms and explain spectral features The high repetition rate makes this system a promising candidate for precision calibration of astronomical spectrographs
29 citations
Posted Content•
TL;DR: In this article, the photoionization process in a hollow-core photonic crystal fiber filled with a Raman-inactive noble gas leads to a constant acceleration of solitons in the time domain with a continuous shift to higher frequencies, limited only by ionization loss.
Abstract: We show theoretically that the photoionization process in a hollow-core photonic crystal fiber filled with a Raman-inactive noble gas leads to a constant acceleration of solitons in the time domain with a continuous shift to higher frequencies, limited only by ionization loss. This phenomenon is opposite to the well-known Raman self-frequency red-shift of solitons in solid-core glass fibers. We also predict the existence of unconventional long-range non-local soliton interactions leading to spectral and temporal soliton clustering. Furthermore, if the core is filled with a Raman-active molecular gas, spectral transformations between red-shifted, blue-shifted and stabilized solitons can take place in the same fiber.
4 citations
TL;DR: In this paper, a continuously twisted PCF is viewed as a one-dimensional metamaterial in which both ϵ and μ tensors develop off-diagonal elements, and finite-element calculations confirm the appearance of unique loss peaks in the experimental transmission spectrum.
Abstract: A continuously twisted PCF can be viewed as a one-dimensional metamaterial in which both ϵ and μ tensors develop off-diagonal elements. Finite-element calculations confirm the appearance of unique loss peaks in the experimental transmission spectrum.
4 citations
Proceedings Article•
22 May 2011TL;DR: In this paper, a high index-contrast hybrid all-solid band-gap-guiding waveguide based on chalcogenide-filled silica photonic crystal fibers is proposed.
Abstract: We discuss high index-contrast hybrid all-solid band-gap-guiding waveguides on the basis of chalcogenide-filled silica photonic crystal fibers. We observe strong band-gaps and pass-bands in devices as short as several millimeters.
1 citations
22 May 2011
TL;DR: In this article, the transient switching dynamics of the forward Raman-like scattering (SRLS) and inter-polarization scattering (SIPS) between orthogonally polarized pump and Stokes waves were studied.
Abstract: Forward stimulated light scattering by GHz acoustic resonances (ARs) guided in a µm-sized photonic crystal fiber (PCF) core gives rise to two classes of scattering: forward stimulated Raman-like scattering (SRLS) between pump and Stokes waves in the same optical mode [1], and forward stimulated inter-polarization scattering (SIPS) between orthogonally polarized pump and Stokes waves [2]. Here we study for the first time the transient switching dynamics of forward SIPS, building on previous studies that were restricted to the steady-state regime [2].
TL;DR: In this article, a dual-beam launching method was proposed to allow controlled optical trapping and high-speed propulsion of microparticles in air-filled hollow-core PCF.
Abstract: A novel dual-beam launching method allows controlled optical trapping and high-speed (9 cm/s) propulsion of microparticles in air-filled hollow-core PCF. Optical, viscous, and gravitational forces can be measured and the particle size determined.
22 May 2011
TL;DR: In this paper, it was shown that if the central core is filled with liquids with a slow reorientational nonlinearity (such as CS 2 or toluene), the equation describing nonlinear light propagation becomes a linear Schroedinger equation, with a discontinuous potential proportional to the total energy of the pulse and to the response function R(t) itself.
Abstract: Solid-core photonic crystal fibers (PCFs) are optical fibers with a central silica core surrounded by a regular array of air holes, that provide guidance [1]. Solid-core PCFs have been well explored for nonlinear applications such as frequency conversion through modulational instability and soliton formation leading to supercontinuum generation [2]. However, PCFs can also be designed to have a central additional hole that can be filled with highly nonlinear liquids [3]. In a recent work [4] we have reported that if the central core is filled with liquids with a slow reorientational nonlinearity (such as CS 2 or toluene), the equation describing nonlinear light propagation becomes a linear Schroedinger equation, with a discontinuous potential proportional to the total energy of the pulse and to the response function R(t) itself. This is temporal analogue of the concept of ‘accessible solitons’ elaborated in 1997 by Snyder and Mitchell in the case of spatial solitons [5].