Robust Geometries for Second-Harmonic-Generationin Microrings Exhibiting a 4-Bar Symmetry
Authors: Guillemé P., Vecchi C., Castellan C., Signorini S., Ghulinyan M., Bernard M., Parisi M., Pavesi L.
Autors Affiliation: Nanoscience Laboratory, Departement of Physics, University of Trento, Italy;
Centre for Materials and Microsystems, Fondazione Bruno Kessler, Trento, Italy;
CNR-INO, Istituto Nazionale di Ottica, Italy
Abstract: Microring resonators made of materials with a zinc-blend or diamond lattice allowexploiting their 4-bar symmetry to achieve quasi-phase matching condition for second-order opticalnonlinearities. However, fabrication tolerances impose severe limits on the quasi-phase matchingcondition, which in turn degrades the generation efficiency. Here, we present a method to mitigatethese limitations. As an example, we studied the geometry and the pump wavelength conditions toinduce the second-harmonic generation in silicon-based microrings with a second-order susceptibility χ(2) ≠ 0. We found the best compromises between performances and experimental requirements,and we unveil a strategy to minimize the impacts of fabrication defects. The method can be easilytransferred to other material systems.
Journal/Review: APPLIED SCIENCES-BASEL
Volume: 10 Pages from: 1 to: 12
KeyWords: microrings; second harmonic generation; optical frequency combsDOI: 10.3390/app10249047