Robust Geometries for Second-Harmonic-Generation in Microrings Exhibiting a 4-Bar Symmetry

Year: 2020

Authors: Guillemy P., Vecchi C., Castellan C., Signorini S., Ghulinyan M., Bernard M., Parisi M., Pavesi L.

Autors Affiliation: Univ Trento, Dept Phys, Nanosci Lab, Via Sommar 14, I-38123 Povo, Trento, Italy; Fdn Bruno Kessler, Ctr Mat & Microsyst, Via Sommar 18, I-38123 Povo, Trento, Italy; CNR, Ist Nazl Ott, INO, Via Campi Flegrei 34, I-80078 Pozzuoli, NA, 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 (24)      Pages from: 9047-1  to: 9047-12

More Information: This work is supported by the NEMO project (PRIN 2015KEZNYM).
KeyWords: microrings; second harmonic generation; optical frequency combs
DOI: 10.3390/app10249047

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