Showing papers in "Optics Communications in 2003"

TL;DR: In this paper, surface plasmon excitation in pairs of identical Au nanoparticles by optical transmission spectroscopy was studied and it was shown that with decreasing interparticle distance the surface plasm resonance shifts to longer wavelengths for a polarization direction parallel to the long particle pair axis whereas a blueshift is found for the orthogonal polarization.

TL;DR: In this paper, a Fano analysis of the related scattering problem is presented by distinguishing two interfering contributions to the transmission process, namely a non-resonant contribution (direct scattering) and a resonance contribution (surface plasmon excitation).

TL;DR: In this article, the nonlinear properties of two distinct chalcogenide glasses were investigated experimentally and theoretically through a spatially resolved Mach-Zehnder interferometer, and it was shown that the resulting nonlinear index coefficient cannot be correctly described with the usual cubic model.

TL;DR: In this paper, an accurate calibration-based phase-shifting measurement technique for measuring the absolute 3D surface profiles is presented, in which the system distortions for each detection location are calibrated individually.

TL;DR: In this paper, it was shown that the spectral degree of coherence of a partially coherent beam may possess isolated pairs of points at which its phase is singular and that in the neighborhood of these points the phase may possess a vortex structure.

TL;DR: In this article, a sensor scheme consisting of a combination of a polymer fibre Bragg grating and a silica fibre grating was proposed for temperature and strain discrimination. But it was not shown to provide a large sensitivity and dynamic range.

TL;DR: In this paper, a 6.75 m2 segmented primary mirror was mounted on a commercial two-axis positioner and focused the solar radiation towards a stationary non-imaging-optics secondary concentrator, which illuminated a Nd:YAG laser rod.

TL;DR: In this article, the influence of the fourth-order dispersion on the onset of scalar spontaneous modulational instability (MI) in a single-mode optical fiber was investigated, and the measured modulation frequencies were in very good agreement with those obtained from the linear stability analysis.

TL;DR: A new technique to encrypt an image for secure image transmission and an optical correlator, in either the JTC or the VanderLugt geometry, or a digital correlation technique, can be used to verify the authenticity of the decrypted image.

TL;DR: In this paper, the nonlinear dynamical properties of an optically injected semiconductor laser subject to optoelectronic feedback are studied numerically and the advantages and potential applications of this hybrid system are discussed.

TL;DR: In this paper, the authors examined the transmission characteristics of the Single mode-Multimode-Single mode (SMS) fiber structures when the spot sizes of the fundamental modes of the single and multimode fibers do not match.

TL;DR: In this article, the authors used the moment method to show that the Raman-induced spectral shift of ultrashort pulses occurs both in the normal and anomalous dispersion regimes and depends not only on the pulse width but also on the frequency chirp associated with an optical pulse.

TL;DR: In this article, the femto and picosecond pulses delivered by the amplifier are coupled into two different photonic crystal fibers and obtained the highest output power of 5 W with a spectrum ranging from below 500 nm up to above 1800 nm.

TL;DR: In this article, a direct and isotropic operator based on the application of an n-dimensional quadrature transform was proposed to normalize a single fringe pattern where spatially varying background and/or modulation act as error sources.

TL;DR: In this paper, a complete model of a Shack-Hartmann wave-front sensor, seen as a grating interferometer, is proposed and a new technique for extracting the phase derivative is also proposed.

TL;DR: In this article, the performance of ultra-fast all-optical XOR gate using two types semiconductor optical amplifier-based Mach-Zehnder interferometers (SOA-MZIs) is analyzed.

TL;DR: Based on spectral interferometry and wavelength multiplexing, a combination of these methods could lead to a 3D imaging system as discussed by the authors, which has the advantage of a one-dimensional geometry transmission channel and a limited scanning need.

TL;DR: In this article, the authors demonstrate the production of an optical beam with a number of embedded optical bottles by passing a Laguerre-Gaussian beam, with a radial mode index of p>1, through an axicon.

TL;DR: In this paper, the Transport of Intensity Equation (TIE) is used for free-space propagation of optical beams, where the linear contribution of the object-plane phase to the intensity distribution in the Fresnel region is described.

TL;DR: This paper presents an image encryption technique, which is based on a recently proposed method of phase retrieval using the FRT, and outlines the implementation of the algorithm and examines the sensitivities of the various encryption keys.

TL;DR: In this article, an all-optical half adder using semiconductor optical amplifier based devices is suggested and demonstrated at 10 Gbit/s, where Boolean AB and AB are obtained and combined to achieve logic SUM.

TL;DR: In this article, a 2 μm Tm3+-doped silica fiber laser using an electro-optic modulation (EOM) was described for the first time, and a larger multimode core of 17 μm diameter was used to increase the laser gain volume and achieve higher pulse energy.

TL;DR: In this article, the authors show that there exists a special configuration, a codimension-two bifurcation called a non-central saddle-node homoclinic orbit, that acts as an organizing centre of excitability in laser systems.

TL;DR: In this paper, nonlinear absorption of Au nanoparticles precipitated silicate glasses by irradiation of a focused femtosecond pulsed laser was investigated using Z-scan technique with 8 ns pulses at 532 nm.

TL;DR: In this article, the spectral properties of a distributed feedback laser diode under external optical injection were analyzed and the output characteristics were mapped as a function of the strength of the optical injection and the detuning between the injection frequency and the free-running frequency of the unperturbed laser.

TL;DR: In this paper, a detailed study of transition loss and pure bend loss in a Holey fiber is presented, and the impact of the fiber structure is considered, and a theoretical model is derived that retains the full refractive index profile of a holey fiber.

TL;DR: In this paper, the Poynting vector and the density of energy associated with surface mode are calculated for left-handed electromagnetic meta-material with three types of conventional materials: dielectrics, metals, and magnetic media with negative magnetic permeability.

TL;DR: In this paper, a liquid-crystal display is used for the generation of an array of Fresnel microlenses, which can be quickly adapted to solve difficult measurement tasks.

TL;DR: In this article, a femtosecond pulse in liquid (methanol) is studied both experimentally and numerically, and the authors focused a 38 fs laser pulse, which is spatially filtered, into a glass cell containing a very dilute solution of Coumarin 440 in methanol.

TL;DR: It is shown that interference between convergent phase factor and the kernel of the different numerical Fresnel transformation may impose serious restrictions on the range of distances, where diffraction patterns can be accurately calculated.