Jacek Kasprzak

Jacek Kasprzak obtained his PhD Degree in 2006 from Joseph Fourier University in Grenoble, France. He was employed at Cardiff University, UK, as a Research Associate (2007) and a Marie-Curie European Research Fellow (2008–2010). He joined CNRS in February 2010.

His current research is focused on the investigation of coherence phenomena in condensed matter. In 2012 he was awarded an ERC Starting Grant to explore propagative and internal coherence in semiconductor nanostructures by means of coherent, nonlinear optical spectroscopy.

Publication list
Full CV

KEY RESULTS

[bleu marine] Cavity QED in semiconductor nanostructures[/bleu marine]

Microcavity controlled coupling of excitonic qubits

Nature Communications 4, 1747 (2013).

Two-dimensional four-wave mixing demonstrating cavity-mediated radiative coupling of excitons
Two-dimensional phase-resolved four-wave mixing diagram measured on a triplet of excitons strongly coupled with the micropillar cavity, demonstrating radiative coupling of excitons.

Up on the Jaynes-Cummings ladder of a quantum dot - microcavity system

Nature Materials 9, 304-308, (2010).

Coherence dynamics and quantum-to-classical crossover in an exciton–cavity system in the quantum strong coupling regime

New Journal of Physics 15, 045013 (2013).

Coherence dynamics measured via four-wave mixing reveals a Jaynes-Cummings nonlinearity in a strongly-coupled exciton-cavity system.

[bleu marine]Coherent nonlinear spectroscopy of single quantum emitters[/bleu marine]

Coherent coupling between distant excitons revealed by two-dimensional nonlinear hyperspectral imaging

Nature Photonics 5, 57-63, (2011).

Two-dimensional four-wave mixing spectroscopy of individual excitons weakly confined on interface fluctuations of a quantum well. Off-diagonal signals reveal mutual coherent couplings between excitons enabled via biexciton renormalization and extended excitonic states formed in such a disordered quantum well.

Vectorial nonlinear coherent response of a strongly confined exciton-biexciton system

New Journal of Physics 15, (2013).

Coherent response of a strongly confined single quantum dot. Exciton and biexciton transitions are driven in the four-wave mixing experiment. One of the corresponding creation pathways is illustrated by a Faynman double-sided diagram.

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[bleu marine]Polariton Condensate[/bleu marine]

Bose-Einstein condensation of exciton polaritons, Nature 443, 409-414, (2006)

Spectrally-resolved far-field emission from a CdTe microcavity, giving an access to energy-momentum space of polaritons. With increasing their density, we witness the onset of polariton condensation.
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