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O: Fachverband Oberflächenphysik

O 34: Poster Session I (Graphene; Plasmonics and nanooptics; Coherence and coherent control in nanophotonics and plasmonics)

O 34.29: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster E

Investigation of Si/chalcogenide hybrid slot waveguides — •Peter Nolte, Christian Bohley, and Jörg Schilling — Martin-Luther-Universität Halle-Wittenberg, ZIK SiLi-nano, Halle, Germany

In the last years great efforts lead to a strong miniaturization of optical components, as several devices were realized on the silicon-on-insulator (SOI) platform which is to CMOS technology. The very high refractive index contrast between the Si core, oxide cladding and air, leads to a high confinement of light inside a waveguide. However, for many applications active devices exhibiting a nonlinear optical behavior are needed. One possible way to boost the nonlinear optical properties in integrated optics is the functionalization of SOI-structures with chalcogenide glasses. These glasses (e.g. As₂S₃) exhibit a nonlinear figure of merit of about Re(χ⁽³⁾) /Im(χ⁽³⁾)= 10 in the near infrared. We present slotted SOI-waveguides which have been clad and infiltrated by chalcogenide glasses. The linear optical properties of the clad waveguides were investigated using a fiber coupled laser setup, tuned from 1490 nm to 1640 nm with 1 pm steps. The nonlinear properties have been studied by means of degenerate four wave mixing. Here, two laser beams with frequencies ω₁ and ω₂ interact with each other through the 3rd order nonlinear susceptibility of the waveguides. Thus two new beams formed. From the conversion efficiency and its intensity dependence the averaged 3rd order nonlinear susceptibility χ⁽³⁾ for the hybrid waveguide device is determined. We demonstrate how hybrid silicon/As₂S₃ waveguides can perform nonlinear frequency conversion via four wave mixing extending the functionality on integrated SOI photonics.