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.

Posted in Non classé | Comments Off on Welcome

Shortcutting relaxation of levitated particles

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

Posted in Non classé | Comments Off on Shortcutting relaxation of levitated particles

New paper in Nature Communication

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.

Posted in Non classé | Comments Off on New paper in Nature Communication

CNRS Bronze medal 2022

A video of Elsa describing her activities (in French)

Posted in Non classé | Comments Off on CNRS Bronze medal 2022

2 years post-doc position available

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

Posted in Non classé | Comments Off on 2 years post-doc position available

How hot are nanodiamonds?

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]

Posted in Non classé | Comments Off on How hot are nanodiamonds?

CNRS bronze medal 2022

Elsa Cassette has been awarded of the CNRS bronze medal for her previous work carried out at LIDYL laboratory. Congratulations Elsa!

Posted in Non classé | Comments Off on CNRS bronze medal 2022

Synthesis of CsPbBr3 nanocrystals

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!

Posted in Non classé | Comments Off on Synthesis of CsPbBr3 nanocrystals

The lab has now moved in 505 Building

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!

Posted in Non classé | Comments Off on The lab has now moved in 505 Building

Motion of Hot Nanodiamonds

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.

A levitated diamond in an optical trap. The NV centres (blue arrow) acts as thermometers to study the coupling between the diamond motion and its internal temperature

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

Posted in Non classé | Comments Off on Motion of Hot Nanodiamonds

Vibration and Aggregation impact light emission by Nanographenes

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

Posted in Non classé | Comments Off on Vibration and Aggregation impact light emission by Nanographenes