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DF: Fachverband Dielektrische Festkörper

DF 10: Optical and nonlinear optical properties, photonic

DF 10.7: Vortrag

Dienstag, 12. März 2013, 11:40–12:00, H11

Phase matching for efficient nonlinear frequency generation in hybrid Si/Chalcogenide glass slot waveguides — Peter W. Nolte, Christian Bohley, and •Joerg Schilling — ZIK SiLi-nano, Martin-Luther-University Halle-Wittenberg, Germany

To circumvent the limitation of strong two photon absorption in nonlinear silicon photonics, hybrid photonic structures have to be used, in which silicon is combined with other materials.

We theoretically investigated the situation for degenerate four wave mixing in silicon slot waveguides which are infiltrated by a chalcogenide glass (e.g. As₂S₃) promising efficient frequency generation within the vicinity of the pump wavelength.

Varying waveguide height, width and slot width we optimized the waveguide cross section to achieve a maximum effective mode area and modes which are well confined to the slot resulting in a figure of merit of 1.3. Furthermore a new phase matching scheme for degenerate four wave mixing in these waveguides was investigated by introducing a periodic index variation along the waveguide. This leads to a photonic band gap and strong band bending in its vicinity allowing the desired group velocity dispersion (GVD) of zero. The usable bandwith is above 40nm for waveguide lengths up to 5mm. With this scheme the phase matching condition can be independently fulfilled from the wave guide cross section and the GVD=0 condition can be easily tuned to the wavelength of interest allowing a flexible design of the hybrid photonic components.