Department of Physics, Engineering Physics & Astronomy

Department of Physics, Engineering Physics & Astronomy
Department of Physics, Engineering Physics & Astronomy

Applications of Quasi-Phase-Matching in Semiconductor Waveguides

Prof. David Hutchings
University of Glasgow, Scotland

Tuesday, May 15, 2007
12:30 PM @ Stirling 261 (or 201)

Abstract:

Quasi-phase-matching is a technique to maintain a coherent interaction between two modes which have different propagation constants by spatially patterning the medium. I will describe two current projects where we make use of this technique. The first is optical frequency conversion where we spatially pattern the second-order optical susceptibility by a process called quantum well intermixing. We demonstrate second-harmonic generation in superlattice waveguides and show how this technique could be used for near- and mid-IR generation using difference frequency or parametric generation with an integrated pump laser. Second, we demonstrate quasi-phase-matching of Faraday rotation and develop the related technology that would allow a waveguide optical isolator to be realised on the same semiconductor chip as the laser source.