Forthcoming Events

05.09.2022 - 09.09.2022, Iseolago hotel, Iseo, Italy.

News

MUST2022 Conference- a great success!
New scientific highlights- by MUST PIs Wörner, Chergui, and Richardson
FELs of Europe prize for Jeremy Rouxel- “Development or innovative use of advanced instrumentation in the field of FELs”
Ruth Signorell wins Doron prizefor pioneering contributions to the field of fundamental aerosol science
New FAST-Fellow Uwe Thumm at ETH- lectures on Topics in Femto- and Attosecond Science
International Day of Women and Girls in Science- SSPh asked female scientists about their experiences
New scientific highlight- by MUST PIs Milne, Standfuss and Schertler
EU XFEL Young Scientist Award for Camila Bacellar,beamline scientist and group leader of the Alvra endstation at SwissFEL
Prizes for Giulia Mancini and Rebeca Gomez CastilloICO/IUPAP Young Scientist Prize in Optics & Ernst Haber 2021
Nobel Prize in Chemistry awarded to RESOLV Member Benjamin List- for the development of asymmetric organocatalysis
NCCR MUST at Scientifica 2021- Lightning, organic solar cells, and virtual molecules
#NCCRWomen- NCCR MUST celebrates 50 years women’s right to vote in Switzerland

Energy relaxation pathways between light-matter states revealed by coherent two-dimensional spectroscopy

September 11, 2020

When a molecule is embedded inside a nanocavity and under certain conditions, new hybrid matter-light states appear, called polaritons. They result from the energy exchange between the optical field inside the nanocavity and the embedded molecules, similar to two coupled pendula exchanging energy.

This leads to changes in the optical properties of the resonator-molecule system. By engineering the properties of the optical field via the nanocavity design, and the way light couples to it, the properties and behavior of “polaritonic systems” can be modified at will and in a systematic fashion.

The energy flow between polaritonic states is crucial to understand for a wide range of applications. In a new article published in Communications Physics, the lab of Majed Chergui at EPFL within the Lausanne Centre for Ultrafast Science, in collaboration with the group of Karl Börjesson at the University of Gothenburg, has managed to gain unique new insights into the energy flow between light-matter states that are created when molecular excitations are coupled to an optical field.

The international team shows how excitation into the energetically higher-lying polaritonic state leads to population of the lowest within tens of femtoseconds. To achieve these results, the authors used state-of-the-art visible multidimensional spectroscopy (an optical domain analogue of nuclear magnetic resonance spectroscopy), which allows to overcome the typically encountered uncertainty between time and energy resolution in spectroscopy and is uniquely suited to study these light-matter interactions. These results demonstrate the ability to engineer light-matter states at will and to control the way energy flows in them. The team’s novel results are deemed to stimulate future experiments on similar systems and contribute to the development of novel applications.


Using state-of-the-art laser spectroscopy, researchers at EPFL and the University of Gothenburg have found how energy flows in real-time among hybrid light-matter states, providing unique insight into the dynamics of these states. The work will help develop novel applications that can use light to tailor-make properties of a material.

See also: EPFL News,
 
Reference: Mewes, L., Wang, M., Ingle, R.A., Börjesson, K., and Chergui, M. (2020). Energy relaxation pathways between light-matter states revealed by coherent two-dimensional spectroscopy. Commun Phys 3, 157 (10.1038/s42005-020-00424-z)

<<
NCCR MUST Office : ETHZ IQE/ULP-HPT H3 | Auguste-Piccard-Hof 1 | 8093 Zurich | E-Mail
The National Centres of Competence in Research (NCCR) are a research instrument of the Swiss National Science Foundation