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Ir. Koen Alexander  (Doctoral Researcher)

This person is no longer working in this group.

Affiliation: Psiquantum
Address: Technologiepark-Zwijnaarde 126 iGent
9052 Zwijnaarde
Belgium
Office: iGent, Office 130.006
Phone: +32 09 33 14842
E-mail: koen.alexander@intec.ugent.be
ResearchGateID: 0000-0002-5048-749X
LinkedIn: koen-alexander
Promotors: Dries Van Thourhout and Bart Kuyken
PhD Thesis: Koen Alexander, Geintegreerde siliciumnitridefotonica met sterk niet-lineaire dunne films en 2D-materialen: eigenschappen en componenten, Integrated Silicon Nitride Photonics with Highly Nonlinear Thin Films and 2D Materials: Properties and Devices, 12/2018
KoenAlexander

Specific Research Topics

Publications (21)

    International Journals

  1. 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).
  2. 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).
  3. K. Alexander, N.A. Savostianova, S.A. Mikhailov, D. Van Thourhout, B. Kuyken, Gate-Tunable Nonlinear Refraction and Absorption in Graphene-Covered Silicon Nitride Waveguides, ACS Photonics, 5(12), p.4944-4950 doi:10.1021/acsphotonics.8b01132 (2018).
  4. K. Alexander, J. George, J. Verbist, K. Neyts, B. Kuyken, D. Van Thourhout, J. Beeckman, Nanophotonic Pockels modulators on a silicon nitride platform, Nature Communications, 9(1), p.3444 doi:10.1038/s41467-018-05846-6 (2018)  Download this Publication (1.2MB).
  5. K. Alexander, N. A. Savostianova, S.A. Mikhailov, B. Kuyken, D. Van Thourhout, Electrically Tunable Optical Nonlinearities in Graphene-Covered SiN Waveguides Characterized by Four-Wave Mixing, ACS Photonics, 4(12), p.3039-3044 doi:10.1021/acsphotonics.7b00559 (2017).
  6. K. Alexander, T. Van Vaerenbergh, M. Fiers, P. Mechet, J. Dambre, P. Bienstman, Excitability in optically injected microdisk lasers with phase controlled excitatory and inhibitory response, Optics Express, 21(22), p.26182-26191 doi:10.1364/oe.21.026182 (2013)  Download this Publication (1.3MB).
  7. T. Van Vaerenbergh, K. Alexander, J. Dambre, P. Bienstman, Excitation transfer between optically injected microdisk lasers, Optics Express, 21(23), p.28922-28932  doi:10.1364/oe.21.028922 (2013)  Download this Publication (1.3MB).
      International Conferences

    1. 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).
    2. 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).
    3. G.F Feutmba, J. George, K. Alexander, D. Van Thourhout, J. Beeckman, Hybrid PZT/Si TM/TE electro-optic phase modulators, SPIE Photonics West : Integrated Optics: Devices, Materials, and Technologies XXIII, 10921, United States, p.109210Q doi:10.1117/12.2509557 (2019).
    4. K. Alexander, J. George, G.F Feutmba, I. Luntadila Lufungula, K. Neyts, B. Kuyken, J. Beeckman, D. Van Thourhout, Nanophotonic PZT-on-SiN Pockels modulators, Smart Photonic and Optoelectronic Integrated Circuits XXI (SPIE Photonics West) (invited), 10922, United States, (2019).
    5. G.F Feutmba, J. George, K. Alexander, D. Van Thourhout, J. Beeckman, Optimization of hybrid PZT/Si electro-optic phase modulators, Annual Symposium of the IEEE Photonics Society Benelux Chapter, Belgium, p.145-148 (2018).
    6. 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).
    7. J. George, K. Alexander, B. Kuyken, D. Van Thourhout, J. Beeckman, Advances in PZT-on-SiN electro-optic modulator platform, Advanced Photonics Congress, Switzerland, p.paper ITh3B.2 (2 pages) doi:10.1364/iprsn.2018.ith3b.2 (2018)  Download this Publication (289KB).
    8. K. Alexander, B. Kuyken, D. Van Thourhout, Electrically Tunable Nonlinear Refraction and Absorption in Graphene-covered SiN Waveguides, CLEO 2018, United States, doi:10.1364/CLEO_QELS.2018.FF2E.3 (2018)  Download this Publication (1.6MB).
    9. K. Alexander, J. George, B. Kuyken, J. Beeckman, D. Van Thourhout, Broadband Electro-optic Modulation using Low-loss PZT-on-Silicon Nitride Integrated Waveguides, CLEO:2017 (Postdeadline), United States, doi:10.1364/cleo_at.2017.jth5c.7 (2017)  Download this Publication (372KB).
    10. K. Alexander, M. Mohsin, U.D. Dave, L. Abdollahi Shiramin, S. Clemmen, D. Neumaier, B. Kuyken, D. Van Thourhout, Electrically Tunable Optical Nonlinearity of Graphene-covered SiN waveguides, Conference on Lasers and Electro-Optics (CLEO) 2017, United States, p.paper FM2F.3 doi:10.1364/cleo_qels.2017.fm2f.3 (2017)  Download this Publication (605KB).
    11. D. Van Thourhout, L. Abdollahi Shiramin, C. Alessandri, K. Alexander, B. Kuyken, M. Pantouvaki, I. Asselberghs, S. Brems, J. Van Campenhout, C. Huyghebaert, Hybrid Graphene-Silicon Photonics Devices for Telecom and Datacom, Graphene 2017, Spain, (2017)  Download this Publication (113KB).
    12. K. Alexander, B. Kuyken, D. Van Thourhout, Characterization of graphene-covered SiN waveguide using four-wave mixing, Annual Symposium of the IEEE Photonics Benelux Chapter, Belgium, (2016)  Download this Publication (178KB).
    13. K. Alexander, Y. Hu, M. Pantouvaki, S. Brems, I. Asselberghs, S.-P. Gorza, C. Huyghebaert, J. Van Campenhout, B. Kuyken, D. Van Thourhout, Electrically Controllable Saturable Absorption in Hybrid Graphene-Silicon Waveguides, Conference on Lasers and Electro-Optics (CLEO), United States, doi:10.1364/cleo_si.2015.sth4h.7 (2015)  Download this Publication (117KB).
    14. T. Van Vaerenbergh, K. Alexander, M. Fiers, P. Mechet, J. Dambre, P. Bienstman, Cascadable excitability in optically injected microdisks, Proc. SPIE 9134, Semiconductor Lasers and Laser Dynamics VI, 91341W, Belgium, doi:10.1117/12.2051962 (2014).
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