Lecture by Julien Claudon, CEA Grenoble

Title: Quantum dots in nanowires, a novel solid-state platform for quantum optics and hybrid nanomechanics

Semiconductor quantum dots are artificial atoms with exceptional optical properties, which are also sensitive probes of their photonic and mechanical environment. In this seminar, I will first briefly review the recent development of tapered nanowire antennas, which efficiently funnel the quantum dot (QD) emission into a directive output beam. Such antennas find direct applications to the realization of bright sources of non-classical states of light [1-3], and more generally to solid-state quantum optics. In the second part of the talk, will see that material strain, which naturally occurs during the vibration of a nanowire, efficiently couples the QD emission energy to the wire vibration amplitude. The resulting hybrid nano-mechanical system [4] has a strong potential for sensing applications [5,6] and, with further improvements, could contribute to the fundamental exploration of the classical-quantum boundary.

Julien Claudon is a researcher at CEA Grenoble. Semiconductor self-assembled quantum dots (InAs/GaAs) constitute the workhorse of his research. At cryogenic temperature, such solid-state mesoscopic artificial atoms feature remarkable optical properties. In a nutshell, he integrates quantum dots (QDs) into structured electromagnetic environments aimed at controlling their spontaneous emission. The research combines fundamental aspects (control of light-matter interaction) with the realisation of advanced optoelectronic devices (sources of non-classical states of light, low-threshold microlasers). More recently, he got interested in the application of mechanical stress on QDs, both in the dynamical and static regimes. He has a strong interest both in device fabrication and optical spectroscopy. He also develops analytical or semi-analytical models, to complement numerical simulations, performed in-house or in collaboration with international experts (N. Gregersen and P. Lalanne for Nanophotonics)

[1] J. Claudon et al., Nature Photon. 4, 174 (2010)
[2] M. Munsch et al., Phys. Rev. Lett. 110, 177402 (2013)
[3] P. Stepanov et al., Appl. Phys. Lett. 107, 141106 (2015)
[4] Y. Yeo et al., Nature Nanotech. 9, 106 (2014)
[5] P.-L. de Assis et al., Phys. Rev. Lett. 118, 117401 (2017)
[6] M. Munsch et al., Nature Communications 8, 76 (2017)

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Tue 10 Oct 17
10:00 - 11:00


DTU Fotonik


Lyngby Campus

Building 340, Line of Light