Nanostructures and Optics – Coupled nano-emitters

List of members


Internships and jobs





  • Permanent members: Laurent Coolen
  • PhD students: Zakarya Ouzit (PhD defended on Oct. 18th 2023), Guillaume Baillard


Our group has a long history of analyzing radiation properties of individual quantum nano-emitters by fluorescence microscopy, such as polarization or directional radiation pattern. We have now turned our attention to the emission of self-assembled chains of nanoplatelets (synthesis B. Abécassis, ENS de Lyon). Emitters within a few nanometers from each other present many potential collective interaction mechanisms which must be understood for opto-electronic applications : mechanical (ligand-induced strain), electronic (charge transfer, dipole-dipole coupling), optical (lasing, superradiance) etc. We have recently shown that self-assembled platelets present very fast (picosecond) Förster transfer so that excitons can diffuse over 500 nm within a platelet chain [1]. This induces a collective behavior of the nanoplatelet chain, demonstrating in particular a collective intermittency of emission [3].


Figure: FRET diffusion of excitons along a self-assembled chain of nanoplatelets


  • Benjamin Abécassis, ENS de Lyon
  • Benoît Mahler, Institut Lumière-Matière, Lyon
  • Benoît Fleury, IPCM, Sorbonne Université



  • [1] Jiawen Liu, Lilian Guillemeney, Benjamin Abecassis, Laurent Coolen. Long Range Energy Transfer in Self-Assembled Stacks of Semiconducting Nanoplatelets. Nano Letters 20, 3465 (2020). ⟨1021/acs.nanolett.0c00376⟩. ⟨hal-02565031⟩
  • [2] Jiawen Liu, Lilian Guillemeney, Arnaud Choux, Agnès Maitre, Benjamin Abécassis and Laurent Coolen. Fourier-imaging of single self-assembled CdSe nanoplatelet chains and clusters reveals out-of-plane dipole contribution. ACS photonics, 7, 2825 (2020). ⟨1021/acsphotonics.0c01066⟩. ⟨hal-02975054⟩
  • [3] Zakarya Ouzit, Jiawen Liu, Juan Pintor, Benoît Wagnon, Lilian Guillemeney, Benjamin Abécassis and Laurent Coolen, FRET-mediated collective blinking of self-assembled stacks of CdSe semiconducting nanoplatelets, ACS Photonics 10, 421 (2023). (1021/acsphotonics.2c01441) (hal-04002582)
  • [4] Zakarya Ouzit, Guillaume Baillard, Jiawen Liu, Benoît Wagnon, Lilian Guillemeney, Benjamin Abécassis and Laurent Coolen, Luminescence dynamics of single self-assembled chains of Förster(FRET)-coupled CdSe nanoplatelets, J. Phys. Chem. Lett. 14, 6209 (2023). (1021/acsphotonics.0c01066) (hal-04149075)