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Christophe Galland
(Laboratory of Quantum and Nano-Optics (EPFL))

Jeudi 10 février 2022 à 9h30

Zoom link: https://univ-grenoble-alpes-fr.zoom.us/j/99705593532?pwd=clcvaEVJRnRoQjhKUFl0b1ZxUHFRQT09


Title: « Molecular Optomechanics »

Abstract: Molecules support internal vibrations that may be seen as the ultimate nanomechanical oscillators for their tiny effective mass and high resonance frequencies (from few to 100 THz) [1]. I will present my group’s recent contributions to the fundamental understanding of collective quantum coherence and hybrid quantum correlations emerging upon Raman scattering between light and molecular vibrations in ambient conditions [2,3], which allow for the generation of frequency tunable entangled [4] and heralded [5] photons.
Next, I will show how light-matter interaction is modified when molecules are embedded in nanocavities with mode volumes orders of magnitude below the diffraction limit [6,7]. In particular, I will describe a new device that performs coherent frequency conversion between the mid-infrared (32 THz, 9.3 µm) and visible domain using molecular oscillators as optomechanical transducers [8,9].

[1] P. Roelli et al., Nature Nano 11, 164-169 (2016)
[2] M. Anderson et al., Physical Review Letters 120, 233601 (2018)
[3] S. Tarrago Velez et al., https://arxiv.org/abs/2105.00213
[4] S. Tarrago Velez et al., Science Adv. eabb0260 (2020)
[5] S. Tarrago Velez et al., Physical Review X 9, 041007 (2019)
[6] A. Ahmed et al., ACS Photonics 8, 1863–1872 (2021)
[7] W. Chen et al., Nature Comm. 12, 2731 (2021)
[8] P. Roelli et al., Physical Review X 10, 031057 (2020)
[9] W. Chen et al., Science 374 1264-1267 (2021)