We have introduced a way to transform basic LEDs into multifunctional devices [1-3]. At the heart of our strategy is to replace the standard active medium by an artificial composite (i.e. a metamaterial) made of colloidal quantum dots coupled with a metallic nanostructured pattern. The hybridization makes it possible to control all aspects of the electroluminescence at the nanoscale (electrical injection, polarization, color) and to weave light-emitting surfaces of unprecedented complexity.
Beyond the potential of these devices for applications, the physics at play in such artificial composites is different from the standard narrative found in the literature and textbooks on nanophotonics [3]. The goal of this PhD thesis is to transition from steady-state effects, which are now well understood [3,5], to transient and dynamical studies. Using photocurrent measurements, time-resolved fluorescence spectroscopy and femtosecond pump-probe techniques, the successful candidate will probe delicate light-matter interactions within artificial composite structures made of colloidal quantum dots and Au nanoparticles. The successful candidate will then develop new active/reconfigurable devices that will leverage the newly discovered effects.
We are looking for a highly motivated individual with a strong physical background in nanophotonics, optoelectronics and solid-state physics as well as basic skills in programming. At the same time, he/she should be open to do extensive experimental work and numerical simulations. A good level of English is also a requisite. The successful candidate will join a dynamic team and will work in a world-class environment in the heart of Paris.
We are looking for a highly motivated individual with a strong physical background in nanophotonics, optoelectronics and solid-state physics as well as basic skills in programming. At the same time, he/she should be open to do extensive experimental work and numerical simulations. A good level of English is also a requisite. The successful candidate will join a dynamic team and will work in a world-class environment in the heart of Paris.
Funding for this PhD thesis is guaranteed (ERC Consolidator Grant).
Example of a metamaterial LED displaying the Chinese word for “light” at the nanoscale © Giovanni Magno
References
[1] Q. Le-Van, X. Le Roux, A. Aassime and A. Degiron, Nature Communications 7, 12017 (2016).
[2] H. Wang, Q. Le-Van, A. Aassime, X. Le Roux, F. Charra, N. Chauvin and A. Degiron, Advanced Optical Materials 6, 170058 (2018).
[3] H. Wang, A. Aassime, X. Le Roux, N.J. Schilder, J.-J. Greffet and A. Degiron, Phys. Rev. Applied 10, 034042 (2018).
[4] D. Schanne, S. Suffit, P. Filloux, E. Lhuillier and A. Degiron, Phys. Rev. Applied 14, 064077 (2020).
[5] A. Caillas, S. Suffit, P. Filloux, E. Lhuillier and A. Degiron, currently under review.