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

Applied Sciences

Maria Parisi¹  Mher Ghulinyan²  Martino Bernard²  Claudio Castellan³  Stefano Signorini³  Chiara Vecchi³  Lorenzo Pavesi³  Pierre Guillemé³ 

[1] CNR-INO, Istituto Nazionale di Ottica, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy;Centre for Materials and Microsystems, Fondazione Bruno Kessler, Via Sommarive 18, 38123 Povo-Trento, Italy;Nanoscience Laboratory, Departement of Physics, University of Trento, Via Sommarive 14, 38123 Povo-Trento, Italy;

关键词: microrings;    second harmonic generation;    optical frequency combs;   

DOI  :  10.3390/app10249047

来源: DOAJ

【 摘 要 】

Microring resonators made of materials with a zinc-blend or diamond lattice allow exploiting their 4-bar symmetry to achieve quasi-phase matching condition for second-order optical nonlinearities. However, fabrication tolerances impose severe limits on the quasi-phase matching condition, which in turn degrades the generation efficiency. Here, we present a method to mitigate these limitations. As an example, we studied the geometry and the pump wavelength conditions to induce the second-harmonic generation in silicon-based microrings with a second-order susceptibility ${\chi }_{zxy}^{\left(2\right)}\ne 0$. 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 easily transferred to other material systems.

【 授权许可】

Unknown