Lavdas, S; (2015) Optical pulse dynamics in sub-wavelength nano-patterned silicon photonic wires. Doctoral thesis , UCL (University College London).

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Abstract

In this thesis, a comprehensive and rigorous theoretical model has been developed in order to study nonlinear optical pulse propagation in silicon nanowires and onedimensional silicon photonic crystal waveguides. Our theoretical model includes all the linear and nonlinear effects, such as free-carrier dispersion, free-carrier absorption, self- and cross-phase modulation, cross-absorption modulation, and free-carrier generation that describe the pulse dynamics in such photonic waveguides. This work presents results pertaining to pulse reshaping and optical signal processing using optical nonlinearities of silicon photonic wires with subwavelength cross-section. We have considered different waveguide configurations, such as adiabatically tapered waveguides, long-period width-modulated Bragg waveguides, and photonic crystal waveguides. In particular, we have illustrated how optical nonlinearity and dispersion engineering of tapered photonic wires can be employed to generate optical similaritons and achieve more than 10 times pulse compression. We also discuss the properties of four-wave mixing pulsed amplification and frequency conversion efficiency in long-period Bragg waveguides and photonic crystal waveguides. In the latter case, a comparison between device performance in the slow- and fast-light regimes is also presented.

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