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Article
Open AccessCurrent tidal power technologies and their suitability for applications in coastal and marine areas
A considerable body of research is currently being performed to quantify available tidal energy resources and to develop efficient devices with which to harness them. This work is naturally focussed on maximis...
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Article
A versatile all-optical parity-time signal processing device using a Bragg grating induced using positive and negative Kerr-nonlinearity
The properties of gratings with Kerr nonlinearity and PT symmetry are investigated in this paper. The impact of the gain and loss saturation on the response of the grating is analysed for different input inten...
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Article
An assessment of coherent coupling through radiation fields in time varying slab waveguides
This paper presents an analytical methodology for analysing two-dimensional, dielectric slab waveguides where the guiding region is subject to abrupt and arbitrary temporal changes in permittivity. The methodo...
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Chapter
Embedding Multiple Wires Within a Single TLM Node
Transmission Line Modelling, TLM, is an established technique for simulating electromagnetic fields in a wide variety of application areas. As with any numerical algorithm, the complexity of the problem that c...
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Chapter
Simulation of Nonlinear Integrated Photonics Devices: A Comparison of TLM and Numerical Time Domain Integral Equation Approaches
The Time Domain Volterra Integral Equation method, TDVIE, and Transmission Line Modelling, TLM, are two approaches for simulating electromagnetic fields in a wide variety of application areas. While TLM is a w...
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Article
Transient Transformation of Whispering Gallery Resonator Modes Due to Time Variations in Dielectric Permittivity
This paper considers the switching effects on whispering gallery modes in circular dielectric resonators when their material is subject to abrupt time changes in permittivity. Both the transient response and t...
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Chapter and Conference Paper
Wave Models for Networks and Fields
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Article
Electromagnetic Modelling of Fine Features in Photonic Applications
Straightforward application of numerical modelling approaches to Photonic Band-Gap structures demands the use of fine meshes, notably finer that the size of a single scattering element, in order that high accu...
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Article
The Design of Single Mode Large Cross-section Glass-based Waveguides for Photonic Integrated Circuits
This paper presents our recent simulation results and novel designs of single mode large cross-section glass-based waveguides for photonic integrated circuits (PICs). Simulations were performed using an in-hou...
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Article
Modal Analysis of Holey Fibres with Convex and Non-Convex Polygon-Shaped Holes
The plane wave and localized function expansion methods are established for bandgap and modal calculations of holey fibres. The calculations rely on evaluating the Fourier transform coefficients of the dielect...
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Article
Effective and flexible analysis for propagation in time varying waveguides
The equivalence between the propagation of dispersive modal fields in two-dimensional waveguides, and plane waves in a one-dimensional plasma is presented. Exploitation of this equivalence allows a time domain...
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Article
Analytic-numerical approach to non-linear problems in dielectric waveguides
A combined analytic-numerical approach is presented for investigations of electromagnetic signal propagation in dielectric waveguides containing a non-linear medium. The approach is based on the resolvent meth...
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Article
Design and optimisation of high-brightness 980 nm laser diodes with distributed phase correction
Designs for 980 nm Al x Ga1−x As/In0.2Ga0.8As/GaAs high-power, high-brightness semiconductor lasers/amplifiers with distributed phase correction and short-cavity lengths (i.e. ca...
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Article
Highly efficient design of spectrally engineered whispering-gallery-mode microlaser resonators
We present an accurate, reliable and versatile method for studying the effect of deformations on the characteristics of the high-Q whispering gallery (WG) modes supported by two-dimensional dielectric resonato...
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Article
All-optical power limiting in waveguides with periodically distributed Kerr-like non-linearity
A slab waveguide with an embedded non-linear grating is considered as an all-optical power-limiting device. The limiting action is based on the power losses at boundaries between grating sections, where a mode...
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Chapter
Mode Propagation along the Multilayered Optical Fibre with Kerr Like Non-Linearity
Light propagation in non-linear fibres with multilayered cladding is investigated numerically using the results of modal analysis. The self-focusing of a leaky mode is shown to improve the fibre transmittance ...
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Chapter and Conference Paper
Precision Calorimetry for Stray Load Loss Determination
The paper explains how the use of calorimetric techniques can lead to a dramatic increase in the accuracy of measurement of both total and stray load losses in induction motors. Analysis of the errors involved...
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Article
Structure related beam propagation
The general theory of a class of structure related (SR) non-orthogonal coordinate systems is introduced for the first time. Special cases of this type of coordinate system used separately or in combination can...
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Article
Efficient and accurate models of buried spot-size convertors
The Free Space Radiation Mode method has been established as an accurate and extremely efficient technique for analysing buried optical waveguide structures. This work demonstrates its application to the simul...
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Article
Facet reflectivity in the presence of a diffracting corner
Results and new theory are presented for the uncoated and coated facet reflectivity of a shallowly buried waveguide, taking account of the diffracting corner present at the air–semiconductor interface. The cor...
