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Title: Nonlinear photonics in silicon-oninsulator photonic wires and their arrays
Author: Staines, Owain Kenneth
Awarding Body: University of Bath
Current Institution: University of Bath
Date of Award: 2013
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We have performed a theoretical study into silicon-on-insulator photonic waveguide arrays. Such waveguides are capable of high levels of light confinement which reinforces the already strong nonlinear response of silicon, making systems involving the waveguidcs ideal for the study of non-linear effects. This study is focussed on two nonlinear processes in relation to the waveguide arrays: optical soli tans and modulational instability, which are often related effects themselves. Optical solitons are pulses localised ill Due or more spatial and/or temporal dimensions which propagate through media -in a. robust, self-reinforcing manner. They require a balance between nonlinearity, diffraction and dispersion. Modulational instability is related to wave-mixing processes whereby photons of a certain frequency arc converted to photons of different frequencies, depending on phase matching and conservation laws. The instability causes the growth of spectral sidebands about a pump pulse, and is often found to occur during soliton propagation. In this thesis a study of the propagation of light within arrays of waveguides is presented, wherein conditions are tuned to promote soliton formation and an emphasis is placed on investigating discrete spatiotemporal solitons. Advantages and disadvantages of employing silicon waveguides for soliton formation are noted with suggestions given to enable minimising of the latter. It is shown that silicon-on-insulator waveguides can provide an excellent medium for supporting discrete spatiotemporal solitons, and where applicable theoretical results have been related to experimental ones performed in tandem . Similar arrays to used to study modulational instability. It is shown that, through exploitation of the supermodes supported by a waveguide array, different degrees of instability, quantified by an amount of 'gain', are possible within the same array. Depending on the initial excitation conditions it is possible for a pulse to experience either large or insignificant amounts of the gain.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available