The NanO-Optics and Spectroscopy team (NOOS) is a research team from the LUMIN lab. We are located in the 505 building of Paris-Saclay University. Our research activity is dedicated to three different topics:
We are always looking for interns. Do not hesitate to contact us.
When perturbing a system, it will necessarily stay out of equilibrium for a time known as the relaxation time. Shortcutting this relaxation time may help improve nanomachines’ efficiency and force sensing scheme.
In a recent work published in Physical Review Letters, we address protocols to shortcut the equilibration time of a levitated particle submitted to a compression. We demonstrate that we can reach 17 times speed-up, and we discuss the robustness of such protocols.
Shortcuts to Equilibrium with a Levitated Particle in the Underdamped Regime
Damien Raynal, Timothée de Guillebon, David Guéry-Odelin, Emmanuel Trizac, Jean-Sébastien Lauret, and Loïc Rondin
Phys. Rev. Lett. 131, 087101 – Published 25 August 2023
Preprint version: arXiv:2303.09542
Nanographene materials are promising building blocks for the growing field of low-dimensional materials for optics, electronics and biophotonics applications. In particular, bottom-up synthesized 0D graphene quantum dots show great potential as single quantum emitters. To fully exploit their exciting properties, the graphene quantum dots must be of high purity; the key parameter for efficient purification is the starting materials’ solubility.
In a recent study led by the team of S. Campidelli at CEA Saclay, in collaboration with Univ. Mons and our team, we report on the excellent individualization of a new family of graphene quantum dots in solution and propose an advanced characterization of their photophysical properties experimentally and theoretically.
This study has just been published in Nature Communication.
A video of Elsa describing her activities (in French)
A 2 years post doc position is available in the group on single molecule studies of graphene quantum dots. The hired postdoc will be involved first in the study of the graphene quantum dots photophysics and will take advantage of the new structures synthesized by our chemist collaborators. Then, he/she will initiate the integration of graphene quantum dots with 2D materials and the optical investigations of these heterostructures. Details of the offer can found here
Levitation of nanodiamonds is a promising platform for spin-optomechanics experiments and the study of quantum physics at the mesoscale.
However, the temperature of levitated particles in optical tweezers, especially diamonds, is an essential element of this goal, and its characterization is crucial.
In a recent paper by F. Rivière, T. De Guillebon et al. we study the heating of levitated nanodiamonds, using atomic defects of the diamond lattice as a nanothermometer. We demonstrate that the heating comes from the whole diamond volume, highlighting the importance of diamond quality for levitation experiments.
More information:
Thermometry of an optically levitated nanodiamond, AVS Quantum Sci. 4, 030801 (2022);[ArXiv]
Elsa Cassette has been awarded of the CNRS bronze medal for her previous work carried out at LIDYL laboratory. Congratulations Elsa!
New paper in the group! In a study lead by Cédric Mayer, the group demonstrates a “Synthesis method of highly calibrated CsPbBr3 nanocrystals perovskites by soft chemistry.” As one can see on the image below, this original method leads to quasi monodisperse CsPbBr3 nanocrystals with a mean size of ~10nm +-1nm. The paper is just accepted in Chem com!
After having been hosted for 3 years in the 520 building (ISMO), the group enters its new building (505) on the Paris Saclay campus! It is now time to rebuild all the experiments!
In a recently published paper, we highlighted how the internal temperature of a levitated nanodiamond impacts its motion, an effect known as hot Brownian motion.
To measure the diamond internal temperature, we used NV centers, point-like defects of the diamond matrix, that act as nano-thermometers. We simultaneously record the nanodiamond motion with an interferometric setup. This allows us to model the link between the nanodiamond motion and temperature.
Our work demonstrates the efficiency of optical levitation for the study of material science at the single nanoparticle level and helps to understand nanodiamonds dynamics in optical traps. This latest constitutes a necessary step toward using levitated diamonds for tests of macroscopic quantum physics.
More information: https://pubs.acs.org/doi/10.1021/acsphotonics.1c01642
In a recent article published in Nanoscale, in association with the theory team of D. Beljonne from Uni. Mons, collaborators from CEA NIMBE,and LPENS, we studied the effect of vibration and aggregation on the optical emission of Graphene Quantum Dots. This work is an important step toward a deep understanding of the photophysical properties of these small piece of graphene. It will thus contribute to their use as building blocks for future optoelectronics and quantum optics devices.
More details: https://doi.org/10.1039/D1NR08279E
