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Article

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

1
Nanoscience Laboratory, Departement of Physics, University of Trento, Via Sommarive 14, 38123 Povo, Trento, Italy
2
Centre for Materials and Microsystems, Fondazione Bruno Kessler, Via Sommarive 18, 38123 Povo, Trento, Italy
3
CNR-INO, Istituto Nazionale di Ottica, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(24), 9047; https://doi.org/10.3390/app10249047
Received: 23 November 2020 / Revised: 10 December 2020 / Accepted: 14 December 2020 / Published: 17 December 2020
(This article belongs to the Section Optics and Lasers)
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 χzxy(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 easily transferred to other material systems. View Full-Text
Keywords: microrings; second harmonic generation; optical frequency combs microrings; second harmonic generation; optical frequency combs
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MDPI and ACS Style

Guillemé, P.; Vecchi, C.; Castellan, C.; Signorini, S.; Ghulinyan, M.; Bernard, M.; Parisi, M.; Pavesi, L. Robust Geometries for Second-Harmonic-Generation in Microrings Exhibiting a 4-Bar Symmetry. Appl. Sci. 2020, 10, 9047. https://doi.org/10.3390/app10249047

AMA Style

Guillemé P, Vecchi C, Castellan C, Signorini S, Ghulinyan M, Bernard M, Parisi M, Pavesi L. Robust Geometries for Second-Harmonic-Generation in Microrings Exhibiting a 4-Bar Symmetry. Applied Sciences. 2020; 10(24):9047. https://doi.org/10.3390/app10249047

Chicago/Turabian Style

Guillemé, Pierre, Chiara Vecchi, Claudio Castellan, Stefano Signorini, Mher Ghulinyan, Martino Bernard, Maria Parisi, and Lorenzo Pavesi. 2020. "Robust Geometries for Second-Harmonic-Generation in Microrings Exhibiting a 4-Bar Symmetry" Applied Sciences 10, no. 24: 9047. https://doi.org/10.3390/app10249047

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