Experimentelle und theoretische Untersuchungen zu Materialien und neuen Bauelementkonzepten der Silizium Photonik. Teilvorhaben. Verbundprojekt: Neuartige Lichtquellen und Komponenten für Silizium-Photonik (SiliconLight). Abschlussbericht . Laufzeit: 01.06.2008 - 31.05.2011
(Englisch)
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A theoretical analysis of the Raman scattering asymmetry in silicon crystal was carried out. The effect of scattering geometry on conversion efficiency as well on the polarization state of output radiation was investigated. A theoretical model for description of stimulated Raman scattering in bulk silicon was developed. The model considers both single- or multi-pass Raman generation and Raman lasing. Using this model a theoretical investigation of Raman conversion in bulk silicon was carried out. Conditions for Raman threshold were determined. Numerical calculation and optimization of Raman conversion efficiency was performed. Simulation of Raman conversion of Raman laser operating at temperature of 10 K was performed. A theoretical model developed for this purpose involves a calculation of free-carriers induced lens. Results of performed simulations are in a good quantitative agreement with experimental results performed by the project partner TUB. The results of calculations show a strong effect of a negative free-carrier lens, which leads to a shortening of the Raman interaction length. It is also shown theoretically that a 1.5 times increase of pump beam diameter results in a 2.5 times increase of Stokes output energy. A theoretical model for description of Raman conversion in a SOI-based ring Raman laser was developed. An investigation of Raman threshold condition was performed. Optimal parameters of Raman cavity length and coupling ratios of the coupler of this laser at pump and Stokes wavelengths were determined. A design of waveguide geometry was carried out using Finite Elements Analysis. The design allowed the creation of the waveguide for a Raman ring laser with defined values of coupling ratios for pump and Stokes wavelengths. The designed integrated structures were realized on chip and investigated by optical techniques. Numerical simulation and design of electric contacts for electro-optical modulators were performed. A contact structure consisting of a transmission part, a matching line, and an active element, was considered. The transmission part impedance was calculated analytically to be 47 Ohms, what means a good matching with standard 50 Ohms coaxial cables. Impedance of the active element and the matching line was calculated numerically using Finite Elements Analysis. Ways for further optimization of impedance matching are shown. Synthesis and preparation of polymeric materials for second order nonlinear optical applications have been carried out with the aim to develop electro-optical modulators especially for fabrication of electric tunable Fabry-Perot filters. Materials with very good film forming properties have been obtained which can be used for fabrication of such electro-optic devices.
Experimentelle und theoretische Untersuchungen zu Materialien und neuen Bauelementkonzepten der Silizium Photonik. Teilvorhaben. Verbundprojekt: Neuartige Lichtquellen und Komponenten für Silizium-Photonik (SiliconLight). Abschlussbericht . Laufzeit: 01.06.2008 - 31.05.2011