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Stéphane Kéna-Cohen
B.Eng. (McGill), M.A., Ph.D. (Princeton)

Research interests and affiliations

Research interests
  • Organic electronics

  • Spectroscopy

  • Nanophotonics

  • Quantum Optics

Our research aims to realise advanced optoelectronic devices (LEDs, solar cells, lasers) using functional molecular and nanostructured materials.

We have undergraduate and graduate projects available for motivated students with an interest in solid-state physics, nanotechnology and photonics.

Expertise type(s) (NSERC subjects)
  • 3111 Lasers
  • 3112 Photonics
  • 3302 Electronic properties of solids
  • 3303 Surfaces, interfaces and thin films
  • 3304 Semiconductors
  • 3306 Optical properties
  • 3308 Superfluids
  • 3403 Spectroscopy
  • 3406 Photochemistry and photophysics


Recent publications
Journal article
Sridharan, A., Noel, N.K., Rand, B.P. & Kéna-Cohen, S. (2021). Role of Photon Recycling and Band Filling in Halide Perovskite Photoluminescence under Focussed Excitation Conditions. The Journal of Physical Chemistry C, 10 pages. Retrieved from
Conference paper
Wang, J., Rousseau, A., Yang, M., Low, T., Francoeur, S. & Kena-Cohen, S. (2020). A Thin Film Black Phosphorus Light-Emitting Diode. Paper presented at the Conference on Lasers and Electro-Optics (CLEO 2020), San Jose, CA, USA (2 pages). Retrieved from
Book chapter
Keeling, J. & Kena-Cohen, S. (2020). Bose-einstein condensation of exciton-polaritons in organic microcavities. In Annual Review of Physical Chemistry (Vol. 71, pp. 435-459). Annual Reviews Inc. Retrieved from
Conference paper
Sridharan, A., Noel, N.K., Rand, B.P. & Kena-Cohen, S. (2020). Diffusion and photon recycling in halide perovskite thin films: Insights from experiment and theory. Paper presented at the Physical Chemistry of Semiconductor Materials and Interfaces (XIX 2020), Virtual, Online, USA (6 pages). Retrieved from


PHS2903 - Metrology Project

PHS3104 - Quantum Mechanics II

PHS4220 - Lasers

PHS8302 - Electronic Devices

APSYS (Crosslight) is used for device modelling in PHS8302.

Supervision at Polytechnique


  • Ph.D. Thesis (2)

    • Hafezian, S. (2019). Growth Control and Study of Ultrathin Silver Films for Energy-Saving Coatings (Ph.D. Thesis, Polytechnique Montréal). Retrieved from
    • Souza Barachati, F.b. (2018). Optical Nonlinearities in the Strong Light-Matter Coupling Regime (Ph.D. Thesis, École Polytechnique de Montréal). Retrieved from
  • Master's Thesis (4)

    • Malinge, A. (2019). Nouveaux matériaux fluorescents pour diodes électroluminescentes organiques (OLEDs) émettant dans le proche infrarouge (Master's Thesis, Polytechnique Montréal). Retrieved from
    • Mohammed Zia Ullah Khan, M.Z.U.K. (2019). Dual Gate Black Phosphorous Photodetectors Using a Polymer Electrolyte for Integrated Photonics and Optoelectronics Applications (Master's Thesis, Polytechnique Montréal). Retrieved from
    • Brodeur, J. (2018). Stratégies pour la conception de diodes électroluminescentes organiques hautement efficaces (Master's Thesis, École Polytechnique de Montréal). Retrieved from
    • Ibrahim, J. (2017). Couplage du séléniure de gallium bidimensionnel à des cavités plasmoniques (Master's Thesis, École Polytechnique de Montréal). Retrieved from

News about Stéphane Kéna-Cohen

NEWS | November 24, 2020
Invisible organic light-emitting diodes reach new world record | Read
NEWS | November 8, 2019
Donna Strickland, co-recipient of the Nobel Prize in Physics in 2018, meets the Polytechnique community | Read
NEWS | August 13, 2018
Projects by two Polytechnique Montréal professors receive NSERC Strategic Partnership Grants | Read
NEWS | January 23, 2018
CFI and the Government of Québec award more than $20 million to four research projects headed by Polytechnique Montréal professors | Read
NEWS | June 5, 2017
A stream of superfluid light | Read

Press review about Stéphane Kéna-Cohen

August 13, 2018, Agenparl, Des projets de deux professeurs de Polytechnique Montréal reçoivent des subventions de partenariat stratégique du CRSNG Plus de 2,1 millions de dollars seront consacrés sur trois ans à trois projets de recherche en génie physique qui sont dirigés par les professeurs Stéphane Kéna-Cohen et Oussama Moutanabbir de Polytechnique Montréal.
January 1, 2018, Québec Science, Une lumière aux propriétés exotiques Avec des collègues du Conseil national de la recherche (CNR) en Italie, Stéphane Kéna-Cohen, professeur adjoint au Département de génie physique de Polytechnique Montréal, a réussi à produire une lumière qui traverse les milieux normalement diffusants sans être diffusée.
June 17, 2017, Trust my science , Des physiciens ont réussi à créer de la « lumière liquide » à température ambiante pour la toute première fois Mention de Stéphane Kéna-Cohen, professeur adjoint au Département de génie physique de Polytechnique Montréal.