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Dr. ir. Francois Leo  (Postdoctoral Researcher)

This person worked in the group from 2011 till 2014.

Affiliation: ULB
Address: Tramlaan, 108
1933 Sterrebeek
Belgique
Fax: +32-9-264 3593
E-mail: [email protected]
Research Area: Nonlinear Optics, Resonators
FrancoisLeo
Born in Ixelles in 1981, he received his diploma in engineering (physics department) from the university of Brussels in 2005. His master thesis was entitled : "Microscopic study of 14O + p elastic scattering". He then worked towards a PhD degree at the OPERA-photonique Department of the Applied Science Faculty of ULB thanks to a Doctoral fellowship of the Belgian Fund for Scientific Research (FRIA). He got the PhD degree in Applied Physical Sciences in November 2010 by defending his thesis entitled "Etude des structures dissipatives dans les cavités optiques passive : théorie et experience" ("Study of the dissipative structures of passive optical cavities : theory and experiment"). He then stayed one year as a Postdoc in Brussels before joining the photonics research group in Ghent.

Specific Research Topics

Current PhD Students

Publications (51)

    International Journals

  1. M. Billet, L.N Reis, Y. Leger, C. Cornet, F. Raineri, I. Sagnes, K. Pantzas, G. Beaudoin, G. Roelkens, F. Leo, B. Kuyken, Gallium phosphide-on-insulator integrated photonic structures fabricated using micro-transfer printing, Optical Materials Express, (2021)  Download this Publication (3.1MB).
  2. J. Wei, C. Ciret, M. Billet, F. Leo, B. Kuyken, S-P. Gorza, Supercontinuum generation assisted by waves trapping in dispersion-managed integrated silicon waveguides, Physical Review Applied, p.054045 (11 pages) doi:10.1103/PhysRevApplied.14.054045 (2020)  Download this Publication (2.7MB).
  3. C. Ciret, K. Alexander, N. Poulvellarie, M. Billet, C. Mas Arabi, B. Kuyken, S-P. Gorza, F. Leo, Influence of Longitudinal Mode Components on Second Harmonic Generation in III-V-on-insulator Nanowires, Optics Express, p.31584-31593 doi:10.1364/OE.402150 (2020)  Download this Publication (1MB).
  4. N. Poulvellarie, U.D. Dave, K. Alexander, C. Ciret, M. Billet, C. Mas Arabi, F. Raineri, S. Combrie, A. De Rossi, G. Roelkens, S-P. Gorza, B. Kuyken, F. Leo, Second Harmonic Generation Enabled by Longitudinal Electric Field Components in Photonic Wire Waveguides, Physical Review A, p.023521 (6 pages) doi:10.1103/PhysRevA.102.023521 (2020)  Download this Publication (1.1MB).
  5. B. Kuyken, M. Billet, F. Leo, Y. Kresten, M. Pu, Octave-spanning coherent supercontinuum generation in an AlGaAs-on-insulator waveguide, Optics Letters, 45(3), p.603-606 doi:10.1364/OL.45.000603 (2020)  Download this Publication (1MB).
  6. C.Ciret, S.P. Gorza, C. Husko, G. Roelkens, B. Kuyken, F. Leo, Physical origin of higher-order soliton fission in nanophotonic semiconductor waveguides, Scientific Reports, 8, p.17177 doi:10.1038/s41598-018-34344-4 (2018)  Download this Publication (2.6MB).
  7. N. Poulvellarie, C. Ciret, B. Kuyken, F. Leo, S.P. Gorza, Highly nondegenerate two-photon absorption in silicon wire waveguides, Physical review Applied, 10(2), p.article 024033 (9 pages) doi:10.1103/physrevapplied.10.024033 (2018)  Download this Publication (473KB).
  8. B. Kuyken, F. Leo, S. Clemmen, U.D. Dave, R. Van Laer, T. Ideguchi, H. Zhao, X. Liu, J. Safioui, S. Coen, S.P. Gorza, S. Selvaraja, S. Massar, R.M. Osgood Jr, P. Verheyen, J. Van Campenhout, R. Baets, W.M.J. Green, G. Roelkens, Nonlinear optical interactions in silicon waveguides, Nanophotonics (invited), doi:10.1515/nanoph-2016-0001 (2016)  Download this Publication (1.2MB).
  9. Charles Ciret, F. Leo, B. Kuyken, G. Roelkens, S.P. Gorza, Observation of an optical event horizon in a silicon-on-insulator photonic wire waveguide, Optics Express, 24(1), p.114-124 doi:10.1364/oe.24.000114 (2016)  Download this Publication (890KB).
  10. A. Subramanian, E.M.P. Ryckeboer, A. Dhakal, F. Peyskens, A. Malik, B. Kuyken, H. Zhao, S. Pathak, A. Ruocco, A. De Groote, P.C. Wuytens, D. Martens, F. Leo, W. Xie, U.D. Dave, M. Muneeb, Pol Van Dorpe, J. Van Campenhout, W. Bogaerts, P. Bienstman, N. Le Thomas, D. Van Thourhout, Zeger Hens, G. Roelkens, R. Baets, Silicon and silicon nitride photonic circuits for spectroscopic sensing on-a-chip , Photonics Research (invited), 5(3), p.B47 doi:10.1364/PRJ.3.000B47 (2015)  Download this Publication (1.5MB).
  11. H. Zhao, B. Kuyken, S. Clemmen, F. Leo, A. Subramanian, A. Dhakal, P. Helin, S. Simone, E. Brainis, G. Roelkens, R. Baets, Visible-to-near-infrared octave spanning suprcontinuum generation in a silicon nitride waveguide, Optics Letters, 40(10), United States, p.2177-2180 doi:10.1364/OL.40.002177 (2015)  Download this Publication (510KB).
  12. B. Kuyken, F. Leo, A. Mussot, A. Kudlinski, G. Roelkens, A two-stage photonic crystal fiber / silicon photonic wire short-wave infrared wavelength converter based on a 1064nm pump source, Optics Express, p.13025-13031 doi:10.1364/oe.23.013025 (2015)  Download this Publication (1.2MB).
  13. B. Kuyken, T. Ideguchi, S. Holzner, M. Yan, T. W. Hansch, J. Van Campenhout, P. Verheyen, S. Coen, F. Leo, R. Baets, G. Roelkens, N. Picque, An octave spanning mid-infrared frequency comb generated in a silicon nanophotonic wire waveguide, Nature Communications, 6(6310), doi:10.1038/ncomms7310 (2015)  Download this Publication (548KB).
  14. U.D. Dave, B. Kuyken, F. Leo, S.P. Gorza, S. Combrie, A. De Rossi, F. Raineri, G. Roelkens, Nonlinear properties of dispersion engineered InGaP photonic wire waveguides in the telecommunication wavelength range, Optics Express, 23(4), p.4650 doi:10.1364/OE.23.004650 (2015)  Download this Publication (1.1MB).
  15. F. Leo, S.P. Gorza, S.Coen, B. Kuyken, G. Roelkens, Coherent supercontinuum generation in a silicon photonic wire in the telecommunication wavelength range, Optics Letters, 40(1), p.123-126 doi:10.1364/ol.40.000123 (2015)  Download this Publication (377KB).
  16. F. Leo, J. Safioui, B. Kuyken, G. Roelkens, S.P. Gorza, Generation of coherent supercontinuum in a-Si:H waveguides: experiment and modeling based on measured dispersion profile, Optics Express, 22(23), p.28997-29007 doi:10.1364/oe.22.028997 (2014)  Download this Publication (987KB).
  17. F. Leo, S-P. Gorza, J.Safioui, P. Kockaert, S. Coen, U.D. Dave, B. Kuyken, G. Roelkens, Dispersive wave emission and supercontinuum generation in a silicon wire waveguide pumped around the 1550 nm telecommunication wavelength, Optics letters, 39(12), p.3623 doi:10.1364/OL.39.003623 (2014).
  18. G. Roelkens, U.D. Dave, A. Gassenq, N. Hattasan, C. Hu, B. Kuyken, F. Leo, A. Malik, M. Muneeb, E.M.P. Ryckeboer, D. Sanchez, S. Uvin, R. Wang, Z. Hens, R. Baets, Y. Shimura, F. Gencarelli, B. Vincent, R. Loo, J. Van Campenhout, L. Cerutti, J.B. Rodriguez, E. Tournie, X. Chen, M. Nedeljkovic, Silicon-based photonic integration beyond the telecommunication wavelength range, IEEE Journal of Selected Topics in Quantum Electronics (invited), 20(4), p.8201511 doi:10.1109/JSTQE.2013.2294460 (2014)  Download this Publication (976KB).
  19. J. Safioui, F. Leo, B. Kuyken, S. Selvaraja, R. Baets, P. Emplit, G. Roelkens, S. Massar, Supercontinuum generation in hydrogenated amorphous silicon waveguides at telecommunication wavelengths, Optics Express, 22(3), p.3089-3089 doi:10.1364/oe.22.003089 (2014)  Download this Publication (1.3MB).
  20. F. Leo, U.D. Dave, S. Keyvaninia, B. Kuyken, G. Roelkens, Measurement and tuning of the chromatic dispersion of a silicon photonic wire around the half band gap spectral region, Optics Letters, 39(3), p.711-714 doi:10.1364/ol.39.000711 (2014)  Download this Publication (456KB).
  21. U.D. Dave, S. Uvin, B. Kuyken, S. Selvaraja, F. Leo, G. Roelkens, Telecom to mid-infrared spanning supercontinuum generation in hydrogenated amorphous silicon waveguides using a Thulium doped fiber laser pump source, Optics Express, 21(26), p.32032-32039 doi:10.1364/oe.21.032032 (2013)  Download this Publication (1.1MB).
  22. G. Roelkens, U.D. Dave, A. Gassenq, N. Hattasan, C. Hu, B. Kuyken, F. Leo, A. Malik, M. Muneeb, E.M.P. Ryckeboer, S. Uvin, Z. Hens, R. Baets, silicon-based heterogeneous photonic integrated circuits for the mid-infrared, Optical Materials Express (invited), 3(9), p.1523-1536 doi:10.1364/OME.3.001523 (2013)  Download this Publication (2.3MB).
  23. N. Hattasan, B. Kuyken, F. Leo, E.M.P. Ryckeboer, D. Vermeulen, G. Roelkens, High-efficiency SOI fiber-to-chip grating couplers and low-loss waveguides for the short-wave infrared, IEEE Photonics Technology Letters, 24(17), p.1536-1538 doi:10.1109/lpt.2012.2208452 (2012)  Download this Publication (455KB).
      International Conferences

    1. L. Reis, M. Billet, F. Raineri, I. Sagnes, K. Pantzas, G. Beaudoin, G. Roelkens, F. Leo, B. Kuyken, Octave-spanning coherent supercontinuum generation in a GaP-on-insulator waveguide, SPIE Photonics West 2024, PC12869, United States, p.PC128690J doi:10.1117/12.3002440 (2024).
    2. L. Reis, M. Billet, T. Vandekerckhove, F. Raineri, I. Sagnes, K. Pantzas, G. Beaudoin, G. Roelkens, F. Leo, B. Kuyken, Large size gallium phosphide micro-transfer printing for integrated nonlinear photonics, Frontiers in Optics + Laser Science 2023 (FiO/LS), United States, p.paper FTh3E.6 (2 pages) doi:10.1364/FIO.2023.FTh3E.6 (2023)  Download this Publication (1.3MB).
    3. M. Billet, T. Vanackere, T. Vandekerckhove, M. Niels, L.N Reis, D. Maes, M. Kiewiet, K. Akritidis, S. Cuyvers, S. Poelman, T. Reep, V. Bonito Oliva, F. Leo, G. Roelkens, B. Kuyken, Filling the gap of silicon nitride photonic platform functionalities using micro-transfer printing, (invited) publication in Advanced Photonics Congress, South Korea,  (to be published)  Download this Publication (154KB).
    4. M. Billet, L.N Reis, T. Vanackere, T. Vandekerckhove, F. Leo, G. Roelkens, B. Kuyken, Heterogeneous integration on silicon nitride for integrated photonics: lasers and nonlinear materials., JNTE 2022 (invited), France, (2022)  Download this Publication (147KB).
    5. S. Cuyvers, G. Morthier, F. Leo, K. Van Gasse, B. Kuyken, Generalized Hybrid Model for Extended Cavity Mode-Locked Laser Diodes, Annual Symposium of the IEEE Photonics Benelux Chapter, Belgium, (2021).
    6. M. Billet, Y. Leger, C. Cornet, F. Raineri, I. Sagnes, G. Roelkens, F. Leo, B. Kuyken, Gallium phosphide-on-insulator photonics enabled by micro-transfer printing, OSA Advanced Photonics Congress, doi:10.1364/IPRSN.2020.ITu2A.6 (2020).
    7. J. Wei, C. Ciret, M. Billet, F. Leo, B. Kuyken, S-P. Gorza, Octave spanning supercontinuum generation in dispersion-managed silicon waveguides, OSA Advanced Photonics Congress, doi:10.1364/IPRSN.2020.IM4A.5 (2020).
    8. M. Pu, Y. Liu, C. Kim, Y. Zheng, E. Semenova, D. Kong, Hao Hu, Michael Galili, L. Katsuo Oxenlowe, B. Kuyken, M. Billet, F. Leo, Kresten Yvind, Broadband optical signal processing in AlGaAs-on insulator waveguides, OSA Advanced Photonics Congress (invited), doi:10.1364/IPRSN.2020.ITu2A.1 (2020).
    9. N. Poulvellarie, U.D. Dave, K. Alexander, C. Ciret, F. Raineri, S. Combrie, A. De Rossi, G. Roelkens, S.P. Gorza, B. Kuyken, F. Leo, Second Harmonic Generation Induced by Longitudinal Components in Indium Gallium Phosphide Nanowaveguides , Nonlinear Optics Topical meeting, United States, p.paper NM3B.2 doi:10.1364/nlo.2019.nm3b.2 (2019)  Download this Publication (1.9MB).
    10. N. Poulvellarie, U.D. Dave, K. Alexander, C. Ciret, S.P. Gorza, F. Raineri, S. Combrie, A. De Rossi, G. Roelkens, B. Kuyken, F. Leo, Experimental observation of second harmonic generation enabled by longitudinal components in Indium Gallium Phosphide naowires, Conference on Lasers and Electro-Optics Europe, Germany, p.paper EF-4.2WED (1 pages) doi:10.1109/cleoe-eqec.2019.8872951 (2019)  Download this Publication (655KB).
    11. U.D. Dave, N. Poulvellarie, K. Alexander, S. Gorza, F. Raineri, S. Combrie, A. De Rossi, G. Roelkens, B. Kuyken, F. Leo, Second Harmonic Generation by Mixing Longitudinal and Transverse Electric Field Components in Indium Gallium Phosphide-on-insulator Wire Waveguides , Advanced Photonics Congress, Switzerland, p.NpTh1C.2 doi:10.1364/np.2018.npth1c.2 (2018)  Download this Publication (193KB).
    12. C. Ciret, F. Leo, B. Kuyken, G. Roelkens, S. Gorza, Optical Nonlinear Propagation Dynamics in Silicon Photonic Wire Waveguides, 32nd URSI GASS (invited), Canada, (2017)  Download this Publication (80KB).
    13. C. Ciret, S. P. Gorza, G. Roelkens, B. Kuyken, F. Leo, Observation of Two-Photon Absorption Induced Soliton Fission , CLEO/Europe-EQEC 2017, Germany, p.EF-1.4 doi:10.1109/cleoe-eqec.2017.8087522 (2017)  Download this Publication (582KB).
    14. G. Roelkens, U.D. Dave, S. Keyvaninia, F. Leo, S. Uvin, K. Van Gasse, Z. Wang, S. Latkowski, E. Bente, B. Kuyken, Frequency comb generation in III-V-on-silicon photonic integrated circuits, Advanced Photonics Congress - IPR (invited), Canada, p.paper IM2A.5 doi:10.1364/iprsn.2016.im2a.5 (2016)  Download this Publication (343KB).
    15. B. Kuyken, R. Van Laer, F. Leo, D. Van Thourhout, R. Baets, G. Roelkens, T. Ideguchi, S. Holzner, M. Yan, A. De Rossi,, F. Raineri,, W. Green, N. Picque, Nonlinear Optics on a Silicon Platform for Broadband Light Generation and Ultrafast Information Processing, The 20th Optoelectronic and Communications Conference (OECC2015), China, p.paper JThE.22 doi:10.1109/oecc.2015.7340158 (2015)  Download this Publication (1.5MB).
    16. H. Zhao, B. Kuyken, F. Leo, S. Clemmen, E. Brainis, G. Roelkens, R. Baets, visible-to-near-infrared octave spanning supercontiuum generation in a partially under etched silicon nitride waveguide, CLEO, United States, doi:10.1364/cleo_si.2015.sf2d.6 (2015)  Download this Publication (354KB).
    17. C. Ciret, F. Leo, B. Kuyken, G. Roelkens, S.P. Gorza, Demonstration of an optical event horizon in a silicon nanophotonic waveguide, CLEO Europe, (2015)  Download this Publication (795KB).
    18. G. Roelkens, U.D. Dave, A. Gassenq, N. Hattasan, C. Hu, B. Kuyken, F. Leo, A. Malik, M. Muneeb, E.M.P. Ryckeboer, D. Sanchez, S. Uvin, R. Wang, Z. Hens, R. Baets, Y. Shimura, F. Gencarelli, B. Vincent, R. Loo, J. Van Campenhout, L. Cerutti, J.B. Rodriguez, E. Tournie, X. Chen, M. Nedeljkovic, G. Mashanovich, L. shen, N. Healy, A. Peacock, X. Liu, R. Osgood, W.M.J. Green, long-wavelength silicon photonic integrated circuits, 11th International Conference on Group IV Photonics (GFP) (invited), France, p.23-24 doi:10.1109/Group4.2014.6962009 (2014)  Download this Publication (706KB).
    19. B. Kuyken, T. Ideguchi, S. Holzner, M.Yan, T.W. Haensch, P. Verheyen, J. Van Campenhuot, S. Coen, F. Leo, R. Baets, W.M.J. Green, N. Picque, R. Baets, G. Roelkens, Towards long wavelength sources integrated on a silicon chip, IEEE Summer Topical Meeting (invited), Canada, (2014)  Download this Publication (385KB).
    20. S.P. Gorza, F. Leo, B. Kuyken, S. Selvaraja, G. Roelkens, R. Baets, Ph. Emplit, S. Massar, J. Safioui, Supercontinuum generation in hydrogenated amorphous silicon waveguides in the femtosecond regime, CLEO-QELS, United States, p.paper FW1D.7 doi:10.1364/cleo_qels.2014.fw1d.7 (2014)  Download this Publication (234KB).
    21. F. Leo, S.P. Gorza, J. Safioui, P. Kockaert, S. Coen, U.D. Dave, B. Kuyken, G. Roelkens, Femtosecond supercontinuum generation in a silicon wire waveguide at telecom wavelengths, CLEO-QELS, United States, p.paper JTu4A.16 doi:10.1364/cleo_at.2014.jtu4a.16 (2014)  Download this Publication (200KB).
    22. F. Leo, B. Kuyken, R. Baets, G. Roelkens, Efficient continuous wave conversion of light beyond the half-bandgap spectral region of silicon, Conference on nonlinear optics, Spain, p.JM5A doi:10.1364/bgpp.2014.jm5a.32 (2014).
    23. F. Leo, S.P. Gorza, S. Coen, B. Kuyken, G. Roelkens, Experimental demonstration of coherent supercontinuum generation in a silicon wire pumped at telecommunication wavelengths , Nonlinear Optics, Spain, p.NTh4A doi:10.1364/np.2014.nth4a.7 (2014).
    24. G. Roelkens, U.D. Dave, A. Gassenq, N. Hattasan, C. Hu, B. Kuyken, F. Leo, A. Malik, M. Muneeb, E.M.P. Ryckeboer, S. Uvin, Z. Hens, R. Baets, Y. Shimura, F. Gencarelli, B. Vincent, R. Loo, J. Van Campenhout, L. Cerutti, J.B. Rodriguez, E. Torunie, X. Chen, M. Nedeljkovic, G. Mashanovich, L. Shen, N. Healy, A.C. Peacock, X. Liu, R. Osgood, W. Green, Mid-IR heterogeneous silicon photonics, Conference on Silicon Photonics IX (invited), United States, p.article 899316 (6 pages) (2014)  Download this Publication (1.8MB).
    25. G. Roelkens, U.D. Dave, A. Gassenq, N. Hattasan, C. Hu, B. Kuyken, F. Leo, A. Malik, M. Muneeb, E.M.P. Ryckeboer, S. Uvin, Z. Hens, R. Baets, Y. Shimura, F. Gencarelli, B. Vincent, R. Loo, J. Van Campenhout, L. Cerutti, J. Rodriguez, E. Tournie, X. Chen, M. Nedeljkovic, G.Z. Mashanovich, L. Shen, N. Healy, A.C. Peacock, X. Liu, R. M. Osgood, W. Green, Mid-IR heterogeneous silicon photonics, Photonics West 2014 (invited), 899316, doi:10.1117/12.2041226 (2013).
    26. S. Uvin, U.D. Dave, B. Kuyken, S. Selvaraja, F. Leo, G. Roelkens, Mid-infrared to telecom-band stable supercontinuum generation in hydrogenated amorphous silicon waveguides, IEEE Photonics Conference 2013 (IPC), United States, p.paper WB2.3 doi:10.1109/ipcon.2013.6656596 (2013)  Download this Publication (195KB).
    27. G. Roelkens, B. Kuyken, F. Leo, N. Hattasan, E.M.P. Ryckeboer, M. Muneeb, C. Hu, A. Malik, Z. Hens, R. Baets, Y. Shimura, F. Gencarelli, B. Vincent, R. Loo, P. Verheyen, G. Lepage , J. Van Campenhout, L. Cerutti, J.B. Rodriguez, E. Tournie, X. Chen, M. Nedeljkovic, G. Mashanovich, X. Liu, W. Green, Long-wavelength III-V/silicon photonic integrated circuits, Advanced Photonics - OSA Optics & Photonics Congress (invited), United States, p.paper IT2A.1 doi:10.1364/iprsn.2013.it2a.1 (2013)  Download this Publication (721KB).
    28. F. Leo, B. Kuyken, N. Hattasan, R. Baets, G. Roelkens, Passive SOI devices for the short-wave infrared, 16th European Conference on Integrated Optics (ECIO 2012), Spain, p.paper 156 (2012)  Download this Publication (1.1MB).
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