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Now showing items 52-71 of 129

FDTDModelling of Dispersive Nonlinear Ring Resonators Accuracy Studies and Experiments

Koos Christian; Fujii Masafumi; Poulton Christopher; Steingrueber Ralf; Leuthold Juerg; Freude Wolfgang (IEEE Publications, 2007)

The accuracy of nonlinear finite-difference time-domain (FDTD) methods is investigated by modeling nonlinear optical interaction in a ring resonator. We have developed a parallelized 3-D FDTD algorithm which incorporates ...
Finite element computation of grating scattering matrices and application to photonic crystal band calculations

Dossou Kokou; Byrne Michael; Botten Lindsay (Elsevier, 2006)

We consider the calculation of the band structure and Bloch mode basis of two- dimensional photonic crystals, modelled as stacks of one-dimensional diffraction gratings. The scattering properties of each grating are ...
First principles calculations using density matrix divide-and-conquer within the SIESTA methodology

Cankurtaran Burak; Ford Michael; Gale Julian (IOP Publishing, 2008)

The density matrix divide-and-conquer technique for the solution of Kohn¿Sham density functional theory has been implemented within the framework of the SIESTA methodology. Implementation details are provided where the ...
Five layer narrow band position variable filters for sharp colours and ultra low emittance

Gentle Angus; Smith Geoffrey (Springer, 2008)

A simplified approach to creating narrow visible and near IR transmission bands with thin films is outlined utilising just five layers on glass, three of which are thin silver. These films have very high reflection at most ...
Gap-edge asymptotics of defect modes in two-dimensional photonic crystals

Dossou Kokou; Mcphedran Ross; Botten Lindsay; Asatryan Ara; De Sterke C (Optical Society of America, 2007)

We consider defect modes created in complete gaps of 2D photonic crystals by perturbing the dielectric constant in some region. We study their evolution from a band edge with increasing perturbation using an asymptotic ...
Gaseous scintillation detection and amplification in variable pressure scanning electron microscopy

Morgan Scott; Phillips Matthew (American Institute of Physics, 2006)

This work investigates the generation and detection of gaseous scintillation signals produced in variable pressure scanning electron microscopy through electron-gas molecule excitation reactions. Here a gaseous scintillation ...
Generalization of the coupled dipole method to periodic structures

Chaumet Patrick; Rahmani Adel; Bryant Garnett (American Physical Society, 2003)

We present a generalization of the coupled dipole method to the scattering of light by arbitrary periodic structures. This formulation of the coupled dipole method relies on the same direct-space discretization scheme that ...
Heat transfer measurement of turbulent spots in a hypersonic blunt-body boundary layer

Fiala, A.; Hillier, R.; Mallinson, S.; Wijesinghe, H. S. (Cambridge University Press, 2006)

This paper presents data on turbulent-spot propagation in the hypersonic boundary-layer flow over a blunted cylindrical body. Data are based on the measurement of time-dependent surface heat transfer rates using gauges ...
Ideal bend contour trajectories for singlemode operation of lowloss overmoded waveguides

Koos Christian; Poulton Christopher; Zimmerman L; Jacome L; Leuthold Juerg; Freude Wolfgang (IEEE Publications, 2007)

Bend designs for single-mode operation of low-loss overmoded waveguides are presented. A class of contour trajectories for minimum radiation loss is derived analytically, and numerical optimization is used to find ideal ...
Image Fidelity for Single- and Multi-Layer Silver Superlenses

Moore Ciaran; Arnold Matthew; Bones Philip; Blaikie Richard (Optical Society of America, 2008)
Imaging Fundamental Electronic Excitations at High Spatial Resolution Using Scanning Cathodoluminescence Microscopy

Phillips Matthew; Drouin Dominique; Moody Steven; Ton-That Cuong (Cambridge University Press, 2009)

NA
Improved measurement with 2-D rotating fluxes considering the effect of internal field

Zhu Jianguo; Guo Youguang; Zhong Jin Jiang; Lin Zhi Wei (Jack) (Institute of Electrical and Electronics Engineers, 2005)

This paper analyzes the effect of the internal field on the measurement with two-dimensional (2-D) rotating fluxes. It is demonstrated that due to the effect of the internal field, the misalignment of H sensing coils, ...
An improved method for calculating resonances of multiple dielectric disks arbitrarily positioned in the plane

Schwefel H; Poulton Christopher (Optical Soc Amer, 2009)

We present a numerically improved multipole formulation for the calculation of resonances of multiple disks located at arbitrary positions in a 2-d plane, and suitable for the accurate computation of the resonances of large ...
An Improved Multiquadric Collocation Method For 3-d Electromagnetic Problems

Guo Youguang; Zhang Y; Zhu Jianguo; Shao Ke; Xie Dx; Lavers J (Institute of Electrical and Electronics Engineers, 2007)

The multiquadric radial basis function method (MQ RBF or, simply, MQ) developed recently is a truly meshless collocation method with global basis functions. It was introduced for solving many 1- and 2-D partial differential ...
Improved observer dependent perception of weak edges when scanning an image in real time indicated by introducing 1/f noise into the primary visual cortex V1. Theory and experimental support

Thornton-Benko E; Nguyen Hung; Hung Arthur; Thornton Barry (Australasian Coll Physical Scientists & Engineers Medicine, 2009)

We present results of a new process for generating 1/f type noise sequences and introducing the noise in the primary visual cortex which then enables improved perception of weak edges when an observer is scanning a complex ...
Improvement of critical current density and thermally assisted individual vortex depinning in pulsed-laser-deposited YBa2Cu3O7-delta thin films on SrTiO3 (100) substrate with surface modification by Ag nanodots

Li, A. H.; Liu, H.; Lonescu, M.; Wang, X.; Dou, S. X.; Collings, E. W.; Sumption, M. D.; Bhatia, M.; Lin, Z.; Zhu, J. (American Institute of Physics, 2005)

YBa2Cu3O7 films were fabricated by pulsed laser deposition on SrTiO3 s100d single-crystal substrates whose surfaces were modified by the introduction of Ag nanodots. The critical current density sJcd was found to increase ...
Local observation of modes from three-dimensional woodpile photonic crystals with near-field microspectroscopy under supercontinuum illumination

Jia Baohua; Norton Andrew; Li Jiafang; Rahmani Adel; Asatryan Ara; Botten Lindsay; Gu Min (Optical Society of America, 2008)

A near-field microscope coupled with a near-infrared (NIR) supercontinuum source is developed and applied to characterize optical modes in a three-dimensional (3D) woodpile photonic crystal (PC) possessing a NIR partial ...
Low switching threshold using nonlinearities in stopbandtapered waveguide Bragg gratings

Maitra Ayan; Poulton Christopher; Wang Jin; Leuthold Juerg; Freude Wolfgang (IEEE Publications, 2005)

We numerically study the nonlinear switching characteristics in a waveguide grating with a linearly tapered stopband. This type of design shows promising results in decreasing the threshold switching power, while ...
Magneto-optical imaging of the magnetization process in colossal magnetoresisitive lanthanum manganite

Polyanskii A; Wang Xiu-Hong; Yao Qw; Dou Shi; Lin Zhi Wei (Jack); Zhu Jianguo (American Institute of Physics, 2006)

To gain insight into the origin of the colossal reduction of resistance in response to magnetic field in colossal magnetoresistance manganite, the magnetic field induced transition in ferromagnetic La0.7Ca0.3MnO3 was ...
Measurement and modeling of core losses of soft magnetic composites under 3-D magnetic excitations in rotating motors

Zhu Jianguo; Lin Zhi Wei (Jack); Guo Youguang; Zhong Jin Jiang (Institute of Electrical and Electronics Engineers, 2005)

Soft magnetic composite (SMC) materials are especially suitable for construction of low-cost high-performance motors with three-dimensional (3-D) magnetic fields. The 3-D finite-element analysis (FEA) conducted in the ...

Now showing items 52-71 of 129

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